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Kveik

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[[File:Historical Brewing Techniques.jpg|thumb|300px|right|[http://www.garshol.priv.no/download/historical-tech/ The book "Historical Brewing Techniques" by Lars Marius Garshol.]]][[File:Kveik_Ring.jpg|thumb|300px|right|[http://www.garshol.priv.no/tmphoto/photo.jsp?id=t329236 Sigmund Gjernes holding a Kveik Ring (gjærkrans). Photo by Lars Marius Garshol.]]][[File:Kveik vs landrace diagram.jpg|thumbnail|300px|right|Diagram of types of yeast versus traditional farmhouse styles by Richard Preiss <ref name="preiss_landrace_diagram" />.]]
'''Kveik''' is a dialect word for "yeast" in Norwegian ("gjær" is the common word for "yeast" in Norwegian <ref>[http://en.bab.la/dictionary/norwegian-english/gjaer Bab.la Dictionary. Retrieved 01/21/2016.]</ref>), and today specifically refers to non-purified yeast that contains multiple domesticated (not wild) strains of ''S. cerevisiae'' and has been reused for generations in traditional Norwegian farmhouse brewing. The Originally the word is also was used as a verb to mean "to start" or to "begin life" <ref>[https://www.youtube.com/watch?v=MCC3tBS2j_Q Ivar Geithung. Chop And Brew Youtube video. 09/21/2019. Retrieved 09/24/2019.]</ref><ref>[https://www.crowdcast.io/e/n2kbq0af Lars Marius Garshol. Presentation for Brewers Association. May 2020. Retrieved 05/18/2020.]</ref> (~1 hour in).
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:# [https://youtu.be/jQdPR0oF-HI?t=306 Norwegian farmhouse brewer, Ivar A. Geithung, pronounces it at around 5 mins in this YouTube Video.]
:# [https://www.youtube.com/watch?v=Y29gVNtzTvw Geithung demonstrates two pronunciations depending on the region of Norway.]
:# [https://youtu.be/7PRz0Sy3XmM?t=1836 Farmhouse brewer Jørund Geving gives an example of the "quake" sounding pronounciation (~30 minutes in).]
:# [https://youtu.be/785Ys6_rb80?t=190 Norwegian farmhouse brewer, Kjetil Dale, pronounces it at 13:10.]
:# [https://translate.google.com/?client=firefox-b-1-d&um=1&ie=UTF-8&hl=en&client=tw-ob#no/en/kveik%0A Google Translate (click the "Listen" button).]
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Kveik yeast are extremely diverse genetically, presenting characteristics that are not typical in other brewing yeasts <ref name="larsblog_analysis">[http://www.garshol.priv.no/blog/349.html "Analysis of farmhouse yeast (kveik)." Larsblog. Lars Marius Garshol. 09/06/2016. Retrieved 09/06/2016.]</ref>. Most farmhouse brewers have started buying their yeast, but some kveik cultures have been passed down from generations and inherited by modern farmhouse brewers in Norway who still use this yeast today and brew with traditional farmhouse methods. Much of the knowledge about kveik and historical farmhouse brewing in Norway has been researched and publicized by Lars Marius Garshol on his blog, ''[http://www.garshol.priv.no/blog/ Larsblog]'', and in the book ''Beer and Brewing Traditions in Norway'' by Odd Nordland (1969). In recent years kveik cultures have been sent to yeast labs for propagation and distribution to brewers around the world <ref name="larsblog_kveik">[http://www.garshol.priv.no/blog/264.html Kveik: Norwegian farmhouse yeast. Larsblog. 11/07/2013. Retrieved 01/14/2016.]</ref>. The use of kveik is one of the many traditional methods still used by a few farmhouse brewers and homebrewers in Norway, along with other historical methods such as infusing the mash or boil with juniper (''Juniperus communis'' <ref>[http://www.garshol.priv.no/blog/368.html Lars Marius Garshol. "The juniper mystery". Larsblog blog. 02/02/2017. Retrieved 12/13/2018.]</ref>), not filtering, using short fermentations to achieve low carbonation, the use of wood-fired copper or iron kettles, and sometimes not boiling the wort ([[Kveik#Raw_Ale|Raw Ale]]) <ref>[http://www.garshol.priv.no/blog/303.html Maltøl, or Norwegian farmhouse ale. Larsblog. 10/11/2016. Retrieved 01/14/2016.]</ref>. Kveik can also be used effectively to ferment a wide range of non-farmhouse styles, such as New England IPA and English beer styles, as well as cider, mead, and mash/wash for distillation.
Farmhouse yeasts from other countries such as Lithuania and Russia have been found to be both genetically different and express different fermentation profiles than the kveik yeasts of Norway, and are therefore not referred to as "kveik". See the [[Landrace_Yeast|Farmhouse Yeasts in Other Countries]] pageand [https://www.garshol.priv.no/blog/420.html "Farmhouse yeast: what do we know?"] by Lars Marius Garshol.
For another a comprehensive list of kveik and other landrace farmhouse yeasts, see also the [http://www.garshol.priv.no/download/farmhouse/kveik.html Farmhouse Yeast Registry maintained by Lars Garshol].
<blockquote>''"I see this is about to become a myth, so just to clear things up: [http://www.garshol.priv.no/blog/380.html kveik is '''not''' a style of beer]. It's farmhouse yeast."'' ~ Lars Marius Garshol, December 29, 2016 <ref name="garshol_style">[https://www.facebook.com/groups/MilkTheFunk/permalink/1532708213424054/?comment_id=1532751916753017&comment_tracking=%7B%22tn%22%3A%22R6%22%7D Lars Marius Garshol. Milk The Funk Facebook group reply on the meaning of the word "kveik". 12/29/2016.]</ref></blockquote>
==Brief History and Description of Kveik==
===Brief History===
Kveik was passed down from generation to generation within the family, and also shared among fellow brewers in the region. In this way, kveik evolved differently than the two major beer yeast genetic groups that are used in industrialized brewing. While mostly POF-, a trait that is selected for in many beer yeast strains that prevents the yeast from producing 4-vinylguaiacol phenol, other traits are reflective of how this yeast was used by traditional farmhouse brewers of the region. For example, as far back as 1621 (and probably prior), kveik was often stored dry on wooden logs called "kveikstokker" for up to a year or longerbefore being re-used in a new batch of beer (the process of re-using yeast from batch to batch is known as "backslopping" in brewing<ref>[https://mmbr.asm.org/content/77/2/157 The Microbiology of Malting and Brewing. Nicholas A. Bokulich, Charles W. Bamforth. 2013. DOI: 10.1128/MMBR.00060-12.]</ref>). Kveik was typically inoculated directly into the wort by submerging the kveikstokker into the wort at 30-40°C. The wort was often high gravity of around 1.080 SG, and the beer was served just after 1-2 3 days of fermentation beginning at this hot inoculation temperature(this was also the case for most farmhouse brewers throughout Europe even though kveik was limited to Norway, indicating that most landrace/farmhouse yeast was fermented this way) <ref>[https://www.tandfonline.com/doi/abs/10.1080/03610470.2021.1945377?journalCode=ujbc20 Lars Marius Garshol (2021) Fermentation Times in Traditional Farmhouse Brewing, Journal of the American Society of Brewing Chemists, DOI: 10.1080/03610470.2021.1945377.]</ref>. The kveik was then taken from the fermenter and dried until its next use. If the kveik went sour or died, brewers would borrow kveik from their neighbors, which was another way of preserving kveik through the centuries. Kveik was sometimes also used to ferment bread. It has been proposed by Preiss et al. (2018) that this treatment has produced yeast strains that are genetically distinct phenotypically from other domesticated yeast strains used in industrial brewing in Europe <ref name="Tyrawa_2017">[https://www.frontiersin.org/articles/10.3389/fmicb.2018.02137/full Traditional Norwegian Kveik Are a Genetically Distinct Group of Domesticated Saccharomyces cerevisiae Brewing Yeasts. Richard Preiss, Caroline Tyrawa, George van der Merwe, Kristoffer Krogerus, Lars Marius Garshol. 2018.]</ref>.
Farmers seemed to have different preferences for top or bottom collecting their kveik for storage <ref name="larsblog_kveik"></ref>. Kveik was stored in many ways. It was often stored in bottles with water or in a well. It was also dried on straw rings, on linen, or pieces of wood with holes drilled through them called "yeast logs". Often ashes were used to help dry the kveik quickly, or in the case of yeast logs, were lowered into the fermentation vessel to collect the yeast and then rolled in flour and allowed to dry for a few minutes, then dipped again to repeat the process. The log was then hung to dry. Although dried kveik was said to last for months or maybe longer, fresh kveik was always preferred and often given away to those who needed new kveik (moldy kveik was thrown away) <ref name="larsblog_kveik"></ref>.
At one time kveik was the only available form of yeast in Norway (and, of course, similar methods for reusing yeast were used all over the world prior to Emil Chr. Hansen's introduction of the pure-yeast system in 1883). However, the existence of kveik has mostly disappeared in recent times. Today kveik remains in the districts of Hardanger, Voss, Sogn, Nordfjord, and Sunnmøre, at least. Kveik is only used by homebrewers who still brew in the traditional methods of Norwegian farmhouse brewing, although the recent spreading of kveik throughout the world has led to a resurgence in its usage to make various types of beer, including non-farmhouse style beers <ref name="larsblog_norwegian_farmhouse">[http://www.garshol.priv.no/blog/259.html Norwegian farmhouse ale. Larsblog. 10/27/2013. Retrieved 01/14/2016.]</ref>.
Thanks to efforts by Lars Marius Garshol and Håken Hveem, and Norwegian farmhouse brewers Svein Rivenes, Sigmund Gjernes, Bjarne Muri, Terje Raftevold, and others, kveik has been made commercially available to brewers around the world. Much of the analysis has been performed by the [http://www.ncyc.co.uk National Collection of Yeast Cultures (NCYC)] and [[Escarpment Laboratories]]. See also the [http://www.garshol.priv.no/download/farmhouse/kveik.html Kveik Farmhouse Yeast Registry] being maintained by Lars Marius Garshol. See also:* MTF podcast interview with Lars Marius Garshol [https://www.milkthefunk.live/podcast/ep001 Part 1] and [https://www.milkthefunk.live/podcast/ep002 Part 2].* [https://www.masterbrewerspodcast.com/199 MBAA podcast interview with Lars Marius Garshol about the different types of farmhouse yeast, history, and highlights of farmhouse brewing.]* [http://www.garshol.priv.no/blog/411.html Garshol's hypothesis that some commercial bread yeast could have originated from farmhouse yeast.]
===Terminology===
* "Kveik" is not a beer style. Its translated meaning is "yeast". For more information, see Lars Marius Garshol's blog post [http://www.garshol.priv.no/blog/380.html "What Does 'Kveik' Mean?"].
* If you do use kveik in a commercial beer, please consider giving the name of the original owner of the kveik on the label. This gives credit to the brewers who have donated their family heritage to the brewers of the world, and it is also helpful for those who want to know exactly which yeast was used in the beer. If you are uncertain about the name of the owner, consult the [http://www.garshol.priv.no/download/farmhouse/kveik.html kveik registryFarmhouse Yeast Registry] <ref name="garshol_preiss_mbaa" /><ref>[https://www.facebook.com/groups/592560317438853?view=permalink&id=2484869138207952 Varying opinions from MTF members, including Norwegians. Milk The Funk Facebook group chat about putting 'kveik' and where it is from on beer labels for mixed fermentation sour beers. 01/28/2019.]</ref>.
* Since the word 'kveik" refers only to Norwegian yeasts, and there are farmhouse yeasts in other countries, the term "landrace yeast" has been proposed to refer to all farmhouse-domesticated yeast. See also [[Landrace Yeast]] and [https://www.facebook.com/groups/MilkTheFunk/permalink/2389386811089519/ this MTF thread discussing the usage of the word "landrace" for these farmhouse yeasts].
* [https://www.facebook.com/groups/kveik/permalink/1857521244303344/ Thread in the Kveik Facebook group on why lab isolated strains are still considered "kveik".] It is useful to distinguish between purified single-strain kveik, purified multi-strain kveik, and unpurified original culture <ref>[https://www.facebook.com/groups/kveik/permalink/1857521244303344/ Lars Marius Garshol. Kveik facebook group thread on kveik terminology. 11/03/2018.]</ref>.
==Yeast Lab Analysis==
[[File:Kveik vs landrace diagram.jpg|thumbnail|300px|right|Diagram of types of yeast versus traditional farmhouse styles by Richard Preiss <ref name="preiss_landrace_diagram" />.]]
[[File:Kveik microscope.jpg|thumbnail|right|The dried kveik samples (Stordal) showed much better viability/cell health (less granulated/wrinkly appearance) than the liquid samples (eg Hornidal). However, some of the liquid samples were pretty healthy too (Voss). Source [https://www.facebook.com/photo.php?fbid=10205280742451727&set=gm.1336954522999425&type=3&permPage=1&ifg=1 Richard Preiss of Escarpment Labs].]]
 
===Species and Phylogeny===
Analysis has also been performed at the Norwegian University of Science and Technology (NTNU) by [https://brage.bibsys.no/xmlui/handle/11250/2390204 Truls C Rasmussen], as well as [[Escarpment Laboratories]].
* [https://www.facebook.com/groups/MilkTheFunk/permalink/2277955402232661/ Updates to the Escarpment Laboratories (Preiss et al.) analysis on MTF.] and their published paper [https://www.frontiersin.org/articles/10.3389/fmicb.2018.02137/full "Traditional Norwegian Kveik Are a Genetically Distinct Group of Domesticated ''Saccharomyces cerevisiae'' Brewing Yeasts"].
In general, most of the cultures of kveik that have been analyzed contain more than one strain of ''S. cerevisiae''. The exact number of strains that is present in a given kveik culture is difficult to analyze; generally labs with better equipment and more time can identify more strains than others. Some kveik cultures contain multiple strains of closely related strains of ''S. cerevisiae'', while others contain a more diverse group of strains <ref name="garshol_preiss_mbaa" />. The kveik cultures with closely related strains defy what a "strain" isolate is; Richard Preiss describes these kveik cultures as being "heterogenous but related communities", meaning that there can be a lot of genetic overlap between subpopulations in a kveik culture and where one strain begins and another ends is not possible to define <ref name="preiss_strains" />. Strains within cultures probably arose due to mutations during cell division, as well as sporulation which kveik is more capable of than other domesticated yeast strains <ref>[https://www.facebook.com/groups/MilkTheFunk/posts/6929359520425536/?comment_id=6929468623747959&reply_comment_id=6933491356679019 Richard Preisse. Milk The Funk Facebook group thread about landrace yeast and sporulation. 05/16/2023.]</ref>. ''S. cerevisiae'' was the only species in all of the kveik cultures analyzed by Preiss et al. (2018), except for the Muri kveik. The Muri kveik contains a single isolate of what appears to be a domestic (human produced) hybrid between ''S. cerevisiae'', ''S. eubayanus'', and ''S. uvarum''. Of the 9 kveik cultures analyzed by Preiss et al. (2018), only Muri(which has since been found to be commercially available Bavarian Weizen yeast and not a landrace farmhouse yeast at all; see [[Landrace Yeast]]), Simonaitis, and Stranda contained only one strain of ''S. cerevisiae'', while all of the others contained more than one strain of ''S. cerevisiae'' up to 9 strains in the case of Granvin (see [https://www.frontiersin.org/files/Articles/409253/fmicb-09-02137-HTML-r1/image_m/fmicb-09-02137-t001.jpg this table from the paper]). A Master's Thesis by [https://nmbu.brage.unit.no/nmbu-xmlui/handle/11250/2681970?show=full Nadia Marlen Aasen from Norwegian University of Life Sciences] isolated 4-10 strains from 4 different kveik cultures: Ørjasæter, Otterdal, Gausemel and Gamlegrua. As with Preiss (2018), the only species of yeast found was ''S. cerevisiae''. While only yeast was found in Otterdal and Ørjasæter, the Gausemel also had two bacteria species, ''Acetobacter malorum'' and ''Lactobacillus plantarum'', and the Gamlegrua also had ''L. plantarum'' <ref name="Aasen">[https://nmbu.brage.unit.no/nmbu-xmlui/handle/11250/2681970?show=full Nadia Marlen Aasen. Growth, metabolism and beer brewing with kveik. Master's Thesis. Norwegian University of Life Sciences. 2020.]</ref>.  Genetically, kveik yeast strains form their own group of closely related domesticated ale strains that are a subgroup of the "Beer 1" yeasts (Belgian/Germany/UK/US yeast strains) from the [http://www.cell.com/cell/fulltext/S0092-8674(16)31071-6 Gillons/White Labs (2016)] study that sequenced previously known ale strains and found them to make up two genetically related groups called "Beer 1" and "Beer 2" (see [[Saccharomyces#History_of_Domestication|''Saccharomyces'' History of Domestication]] and [http://www.garshol.priv.no/blog/374.html "A family tree for brewer's yeast" by Lars Marius Garshol]). The closest related domesticated strains were 3 German hefeweizen strains; however, this relation is likely just due to both groups being hybrids rather than having any historic relation <ref name="Tyrawa_2017" />. None of the kveik strains sequenced by Preiss et al. (2018) contained the STA1 gene for diastaticusdiastatic activity, which is expected since all of the diastaticus diastatic yeasts belong to the "Beer 2" group <ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/2445690998792433/?comment_id=2446266075401592&reply_comment_id=2446269382067928&comment_tracking=%7B%22tn%22%3A%22R5%22%7D Richard Preiss. Milk The Funk Facebook thread on kveik and the STA1 gene. 01/03/2018.]</ref>.
Although whole genome sequencing of more kveik strains is needed in order to fully flesh out a family tree of kveik <ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/2277955402232661/?comment_id=2279696338725234&reply_comment_id=2279736462054555&comment_tracking=%7B%22tn%22%3A%22R%2321%22%7D Richard Preiss. Milk The Funk Facebook group comment about the two families of kveik yeast. 09/13/2018.]</ref>, based on the 6 strains that were analyzed, kveik strains seem to be divided into two related genetic groups, with the Muri, the Simonatis Lithuanian strain, and a Norwegian bread yeast falling outside of these two groups completely, which arguably categorizes them to not actually be considered "kveik". The two groups of kveik probably originated from two ancestors that were hybrids between a "Beer 1" yeast and wild yeast. Interestingly, the kveik cultures that have multiple strains have strains from both genetic groups of kveik. For example, Hornindal, Granvin, Laerdal, and Stordal Ebbergarden all contained strains from both genetic groups of kveik. Overall, their genetic diversity is wider than the genetic diversity of other "Beer 1" subgroups <ref name="Tyrawa_2017" />. See this [https://www.frontiersin.org/files/Articles/409253/fmicb-09-02137-HTML-r1/image_m/fmicb-09-02137-g002.jpg updated family diagram of yeast].
Preiss et al. (2018) also measured the fermentation characteristics of individual kveik strains in their study, the first published data in this regard for kveik. At 86°F (30°C) they found that 11 of the 24 pure strains of kveik outperformed the best control strain (WLP002) in fermentation rate. There was still a very wide range of attenuation rates between the kveik strains (60-90%). Of the 6 strains that had their DNA sequenced, all but one of the Granvin strains fermented maltotriose. All of the strains tested were POF- (meaning they did not produce significant 4-vinylguaiacol phenol) except the Muri strain which is not genetically related to kveik. One of these Stordal Ebbegarden strains also contained a unique mutation on the ''FDC1'' gene that results in the inability to produce phenols and has not been reported before in science. They also found that kveik strains tend to produce fatty acid esters at levels that are typical for other domesticated yeast strains, such as ethyl caproate (pineapple, tropical; threshold 0.21 ppm), ethyl caprylate (tropical, apple, cognac; threshold 0.9 ppm), and ethyl decanoate (apple; threshold 0.2 ppm). The kveik strains studied did not produce high levels of the isoamyl acetate ester (banana) and generally lower levels of the fusel alcohol isobutanol compared WLP001 and WLP002. Strangely, 5 of the 6 strains that were analyzed could form spores, which is not typical for brewers yeast <ref name="Tyrawa_2017" />.
The kveik strains studied by Preiss et al. (2018) displayed unique abilities as far as withstanding stress in their environment. Most of the strains at least doubled their growth at 43°C and grew to their maximum potential at 40°C, while the control strains WLP001, WLP002, and WLP029 showed limited growth at those temperatures. This demonstrates kveik's ability to withstand high-temperature fermentations. All strains tested died at 45°C <ref name="Tyrawa_2017" />.
===Sensory and Fermentation Profile===
The general flavor profile of kveik yeast is ester-driven and non-phenolic, although a wide range of subtle differences can exist between strains. Kveik in its traditional form is usually a blend of closely related strains. The "Stranda" kveik was described as "lemon, nuts, grain, and straw" by Lars Marius Garshol. The "Hornindal kveik" with bacteria was described as "fruity, milky caramel, honey, and mushroom with a very unique aroma". The "Muri kveik" was described as "earthy on the nose, and fruity tasting with hints of rubber and sulfur and a thinner mouthfeel than the others" <ref name="kveik_testingTyrawa_2017"></ref>.
Kveik has adapted to being fermented at relatively warm temperatures without producing off-flavors (fusel alcohols, diacetyl, or acetaldehyde), usually in the range of 30-40°C (86-104°F), but also as high as 43°C (109°F). The beer is finished fermenting within a day or two at these warmer temperatures. Årset kveik has been fermented as low as 4°C (39°F), which produced a clean and drinkable beer with a fruity aroma. They have a high alcohol tolerance of around 13-16% ABV <ref name="garshol_preiss_mbaa">[https://www.mbaa.com/publications/tq/tqPastIssues/2018/Pages/TQ-55-4-1211-01.aspx How to Brew with Kveik. Lars Marius Garshol and Richard Preiss. MBAA Technical Quarterly, 2018 Q4.]</ref>. [http://www.omegayeast.com/ Omega Yeast Labs] describes their two isolates (Voss and HotHead) as being non-phenolic, fruity, and complimenting American citrus hops. They also note that the yeast has a very high temperature range (~68-98°F or ~20-37°C), attenuates high, tends to flocculate well, and also tends to ferment faster at the mid to high temperature ranges, while producing similar ester profiles throughout the entire temperature range. Other kveik cultures generally produce subdued aromas below 20°C (68°F); different kveik cultures react differently at different fermentation temperatures <ref name="garshol_preiss_mbaa" />. Despite the fast fermentation timeframe that traditional farmhouse brewers employ and the high flocculation that some kveik have, some kveik and some beer styles/brewing conditions may still require or benefit from a more traditional brewing schedule. For example, some kveik may need more time to clean up diacetyl or hydrogen sulfide, to flocculate or settle out completely, or to completely finish attenuation. Keep mind that the farmhouse beers, brewing techniques, and drinking culture differ quite a bit from modern beers, modern brewing techniques, and modern beer packaging/consumption. For example, shelf stability is generally not a concern for farmhouse brewers. Fermenting beer with kveik on the same fast time schedule and in the same ways as the traditional farmhouse beers and without making adjustments such as increased nutrients or increased conditioning time might result in less than stellar beer for modern styles <ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/2804718906222972/?comment_id=2804964392865090&reply_comment_id=2805567092804820&comment_tracking=%7B%22tn%22%3A%22R%22%7D Richard Preiss, Ingo Janssen, and Dan Pixley. Milk The Funk Facebook group on not treating kveik as "super yeast". 07/24/2019.]</ref>.
 
Pitching rates for kveik are also one of the unique things about these cultures. In general, pitching at typical ale pitching rates produce subdued esters. In order to express the yeast fermentation profile more, kveik cultures are traditionally pitched at a very low rate, perhaps somewhere around the 1-2 million cells/mL for 15-20°P wort. However, pitching at [http://wyeastlab.com/pitch-rates normal ale pitching rates] should not produce negative results, and brewers should experiment with the pitching rates for a given kveik strain of mixed culture and determine which pitching rates produce the most desirable results. Escarpment Labs recommends pitching 70% of normal pitching rates, but Richard Preiss reported no issues so far pitching at 25% of normal pitching rates <ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/2808232119204984/?comment_id=2808521072509422&reply_comment_id=2812164392145090&comment_tracking=%7B%22tn%22%3A%22R%22%7D Richard Preiss. Milk The Funk Facebook thread on Escarpment Labs recommended kveik pitching rates. 07/27/2019.]</ref>. Omega Yeast Labs recommends normal pitching rates for kveik, but reported no significant difference between under-pitching and normal pitching rates; however, reports of off-flavors might be related to extreme under-pitching and/or lack of nutrients <ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/2808232119204984/?comment_id=2808521072509422&reply_comment_id=2812793862082143&comment_tracking=%7B%22tn%22%3A%22R%22%7D Adi Hastings. Milk The Funk Facebook thread on under-pitching kveik and potential off-flavors. 07/27/2019.]</ref><ref>[https://youtu.be/7HVms3HSc9I?t=3803 Mark Schwarz. "Norwegian Kveik Strains and More with Omega Co-Founder Mark Schwarz" at Texas Brewing Inc. 05/14/2019. Retrieved 07/27/2019.]</ref> (~1:03:20 mins in). Oxygen should be at least in the 5-8 ppm range, although 10-12 ppm might be beneficial. [[Kveik#Kveik_Ring.2FKveikstokk_and_Drying|Dried kveik cultures]] have a cell density of around 9-18 billion cells per gram of dried yeast (Fermentis has around 31 billion cells per gram by comparison), and so pitching as little as 10 grams of dried kveik into 100L of wort is fine. Dried kveik is generally rehydrated in first runnings for about 2-4 hours before pitching into the main batch (lautering in traditional farmhouse brewing can take a long time), with a [http://www.garshol.priv.no/blog/367.html yeast scream] being traditional to ward off evil spirits. Kveik cultures are heavily dependent on nutrients, and wort that is lower than 1.050 can benefit from doubling nutrient additions <ref name="garshol_preiss_mbaa" />. Richard Preiss recommends 180+ ppm of free amino nitrogen (FAN), along with vitamins (yeast nutrient blends offered by many yeast labs should be able to satisfy these requirements; contact the vendor to find out the specified FAN dosage and vitamin content) <ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/2601801236514741/?comment_id=2602693406425524&reply_comment_id=2758757460819117&comment_tracking=%7B%22tn%22%3A%22R%22%7D Richard Preiss. Milk The Funk Facebook post on FAN requirements for kveik. 06/30/2019.]</ref><ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/2825984810763048/?comment_id=2827018853992977&comment_tracking=%7B%22tn%22%3A%22R%22%7D Richard Preiss. Milk The Funk Facebook group thread on vitamin requirements for kveik. 08/03/2019.]</ref>.
Kveik mixed cultures tend to be very flocculant, even though only about 48% of the individual strains are highly flocculant (it is thought that high flocculating strains help the lower flocculating strains to flocculate). Top-harvested kveik form a thick krausen and tends to float on top of liquid even when stored in the fridge, while bottom-harvested kveik tends to form a thin layer of krausen (see the [http://www.garshol.priv.no/download/farmhouse/kveik.html Farmhouse yeast registry] to see which kveik cultures are top vs bottom harvested; the listed harvesting method should be continued so as to continue to select for the correct strains). Harvested kveik can be stored in the refrigerator as a slurry, and survive 1-2 years (a starter should be made after about 6 months of cold storage). Attenuation ranges from 60-90% for single strains, but for mixed cultures, the attenuation is usually on the higher side <ref name="garshol_preiss_mbaa" />.
* Stordal (ebbegarden) 1 - rum-like, slightly hot, medium mixed esters, round and malty
* Stordal (ebbegarden) 2 - Christmasy, citrus, red apple, floral, clean and balanced flavour
* Muri 1 (not related to kveik genetically; later found to be Bavarian Weizen yeast) - Earthy, herbal, sulfury, apple, pear, very slight clove, not super dry despite ridiculous attenuation (~95%)
* Voss (Gjernes) 1 - Orange, floral, balanced flavour, good body
* Voss (Gjernes) 2 - Cidery, floral, slight earthiness, slight orange, clean, dry
Note regarding Granvin strains: Preiss is still trying to sort out which Granvin yeasts are duplicates and which are unique.
 
====Unpurified/Mixed Cultures vs Single Isolates====
While brewers have made many claims about the difference of unpurified kveik cultures compared to single isolates offered by yeast labs, little work has been done so far to differentiate the effects of pitching original unpurified cultures of kveik versus lab isolates. This is mostly due to the complexity of these mixed cultures, which makes it difficult to study in a laboratory setting. Dr. Maitreya Dunhman noted during a laboratory study on yeast repitching that repitching unpurified or mixed strains of kveik led to at least one observable effect, which is that the strains do not appear to out-compete each other. Normally, when two strains are combined and repitched, one strain tends to rise to dominate the population over the other strains in the population. This was not the case with kveik, which indicates some sort of mutual benefit between strains within the original kveik mixed cultures <ref>[https://www.youtube.com/watch?v=sPHwItOxuK0 Dr. Maitreya Dunham. Interview on Escarpment Labs YouTube channel. 08/18/2021.]</ref>(~44:30 mins in).
 
====Final Beer pH====
 
Kveik also tend to finish beers at a slightly low pH than conventional ale yeast and lager yeast. In a survey of data from around 60 strains of yeast total, Escarpment Labs showed that kveik strains on average finished around 4.25 final beer pH while conventional ale/lager yeast strains finished on average around 4.50 final beer pH for the same wort. This can have an impact on the overall sensory nature of kveik. For example, a lower pH is sometimes associated with the perception of a thinner body as well as a harsher and more astringent hop character. The use of buffering minerals in the mash such as baking soda, lime, or chalk, can help adjust the pH back up if desired <ref>[https://www.escarpmentlabs.com/single-post/2019/10/20/Crispy-brewing-with-kveik Richard Preiss. Escarpment Labs blog post, "Crispy brewing with kveik: mind the pH gap." 11/26/2019. Retrieved 11/26/2019.]</ref><ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/3082701461758047/ Richard Preiss. Milk The Funk Facebook thread on kveik resulting in a lower pH for final beer. 11/26/2019.]</ref>.
 
This tendency to producer slightly lower pH beers than normal brewing yeast is not universal, however. Fermentation conducted with unpurified original kveik cultures may have different results than single isolate strains. For example, [https://nmbu.brage.unit.no/nmbu-xmlui/handle/11250/2681970?show=full Nadia Marlen Aasen's Master's thesis from Norwegian University of Life Sciences] found that the same wort (Weyermann Pilsner malt, 60 minute Magnum hops at 18 IBU, and the wort soaked in 1 kg of juniper twigs per 10 liters of wort) fermented with US-05 finished between 3.8-4.0 pH, Ørjasæter kveik finished at 4.1-4.2 pH, Gamlegrua kveik finished at 4.1-4.3, and Gausemel kveik finished at 3.8-4.0 pH <ref name="Aasen" />.
 
See also:
* [https://www.escarpmentlabs.com/single-post/2019/10/20/Crispy-brewing-with-kveik "Crispy brewing with kveik: mind the pH gap," by Richard Preiss at Escarpment Labs.]
 
====Propagation Characteristics====
[https://www.mbaa.com/publications/tq/tqPastIssues/2022/Pages/TQ-59-3-1015-01.aspx Carriglio et al. (2022)] compared propagation characteristics between WLP001 (California Ale Yeast), WLP830 (German Lager Yeast), and WLP518 (Opshaug kveik), using modern yeast propagation methods (12.5°P wort, 25°C temperature, 14.7 grams of yeast nutrient, constant aeration, recirculated with a pump, and with a total propagation time of 26 hours). The study measured attenuation, FAN consumption, final cell density, and final biomass production. They found that Opshaug did not uptake FAD any differently than the ale and lager yeasts. Opshaug had slightly less attenuation. They found that Opshaug kveik had a higher cell density than the ale and lager strain (~803 million cells per mL, versus ~461 million cells per mL for WLP001 and ~593 million cells per mL for WLP830). Aasen's Master's thesis showed similarly higher levels of cell density for kveik strains versus US-05 during fermentation ([[Kveik#Temperature_and_Growth_Rate|Temperature and Growth Rate]] below). The Opshaug kveik also nearly doubled the biomass production of ale and lager yeast <ref>[https://www.mbaa.com/publications/tq/tqPastIssues/2022/Pages/TQ-59-3-1015-01.aspx Comparison of Kveik with Conventional Saccharomyces Brewing Strains for Propagation Characteristics, Biomass Production, and Biomass Conversion Rate​​. MBAA TQ https://doi.org/10.1094/TQ-59-3-1015-01​. John C. Carriglio and Andrew J. MacIntosh. Food Science and Human Nutrition Department, University of Florida, Gainesville, FL, USA. 2022.]</ref>. These characteristics may or may not extend to other kveik strains, and different propagation temperatures may produce different results for all characteristics measured. See also [[Kveik#Temperature_and_Growth_Rate|Temperature and Growth Rate]] below.
 
====Pitching Rate====
Pitching rates for kveik are also one of the unique things about these cultures. Kveik cultures are traditionally pitched at a very low rate, perhaps somewhere around the 1-2 million cells/mL for 15-20°P wort. However, pitching at [http://wyeastlab.com/pitch-rates normal ale pitching rates] should not produce negative results, and brewers should experiment with the pitching rates for a given kveik strain of mixed culture and determine which pitching rates produce the most desirable results. Escarpment Labs recommends pitching 70% of normal pitching rates, but Richard Preiss reported no issues so far pitching at 25% of normal pitching rates <ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/2808232119204984/?comment_id=2808521072509422&reply_comment_id=2812164392145090&comment_tracking=%7B%22tn%22%3A%22R%22%7D Richard Preiss. Milk The Funk Facebook thread on Escarpment Labs recommended kveik pitching rates. 07/27/2019.]</ref>. Omega Yeast Labs recommends normal pitching rates for kveik, but reported no significant difference between under-pitching and normal pitching rates; however, reports of off-flavors might be related to extreme under-pitching and/or lack of nutrients <ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/2808232119204984/?comment_id=2808521072509422&reply_comment_id=2812793862082143&comment_tracking=%7B%22tn%22%3A%22R%22%7D Adi Hastings. Milk The Funk Facebook thread on under-pitching kveik and potential off-flavors. 07/27/2019.]</ref><ref>[https://youtu.be/7HVms3HSc9I?t=3803 Mark Schwarz. "Norwegian Kveik Strains and More with Omega Co-Founder Mark Schwarz" at Texas Brewing Inc. 05/14/2019. Retrieved 07/27/2019.]</ref> (~1:03:20 mins in). Oxygen should be at least in the 5-8 ppm range, although 10-12 ppm might be beneficial. [[Kveik#Kveik_Ring.2FKveikstokk_and_Drying|Dried kveik cultures]] have a cell density of around 9-18 billion cells per gram of dried yeast (Fermentis has around 31 billion cells per gram by comparison), and so pitching as little as 10 grams of dried kveik into 100L of wort is fine. Dried kveik is generally rehydrated in first runnings for about 2-4 hours before pitching into the main batch (lautering in traditional farmhouse brewing can take a long time), with a [http://www.garshol.priv.no/blog/367.html yeast scream] being traditional to ward off evil spirits. Kveik cultures are heavily dependent on nutrients, and wort that is lower than 1.050 can benefit from doubling nutrient additions <ref name="garshol_preiss_mbaa" />. Richard Preiss recommends 180+ ppm of free amino nitrogen (FAN), along with vitamins (yeast nutrient blends offered by many yeast labs should be able to satisfy these requirements; contact the vendor to find out the specified FAN dosage and vitamin content) <ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/2601801236514741/?comment_id=2602693406425524&reply_comment_id=2758757460819117&comment_tracking=%7B%22tn%22%3A%22R%22%7D Richard Preiss. Milk The Funk Facebook post on FAN requirements for kveik. 06/30/2019.]</ref><ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/2825984810763048/?comment_id=2827018853992977&comment_tracking=%7B%22tn%22%3A%22R%22%7D Richard Preiss. Milk The Funk Facebook group thread on vitamin requirements for kveik. 08/03/2019.]</ref>.
 
[[Escarpment Laboratories]] presented the first [https://www.escarpmentlabs.com/single-post/2019/11/01/The-impact-of-pitch-rate-on-kveik-ferments controlled experiment and data set] for how pitching rates might affect kveik. The lab fermented their Årset blend (a selection of several strains from Årset; see [https://www.facebook.com/groups/MilkTheFunk/permalink/2593762590651939/?comment_id=2593908627304002&reply_comment_id=2594146987280166&comment_tracking=%7B%22tn%22%3A%22R%22%7D this explanation from Richard Preiss]), Ebbegarden (contains two strains from the original Ebbegarden), the Escarpment Labs Voss single isolate, the Escarpment Labs Raftevold's Hornindal (contains two strains from the original Raftevold Hornindal), and the Vermont ale strain which was used as the control. The strains were fermented at 20ºC (the lab would have preferred to ferment at a warmer temperature, but this was a part of a much larger fermentation experiment with many other brewing strains and they were limited due to limited temperature control equipment). The pitch tested rates were:
# '''1 M/mL''' (1 million cells per mL, 10% of a typical pitch rate)
# '''7 M/mL''' (7 million cells per mL, 70% of a typical pitch rate)
# '''10 M/mL''' (10 million cells per mL, a typical pitch rate)
 
They monitored specific gravity, FAN consumption, pH change, alcohol/glycerol production, and aroma compound production (using GC-MS). All ferments were performed in triplicate. Their major findings are listed as follows:
 
* A low pitching rate of 1 million cells/mL attenuated the sample slightly slower than the higher pitching rates, but all pitching rates resulted in a similar finishing gravity, including the Vermont Ale yeast. The kveik fermented faster than other brewer's yeast even at the lower fermentation temperature.
* There were no clear trends as far as how much FAN was consumed by the kveik based on pitching rate, although Årset and Vermont Ale yeast consumed less FAN for the lowest pitching rate. They concluded that high FAN levels are recommended, especially for lower gravity wort.
* Terminal pH was lower for Årset and Ebbegarden, and a little higher for the other strains (~4.15 versus ~4.4); however, pitching rate did not correlate to any patterns.
* No discernible trend in over all ester production depending on pitch rate, although there were some differences depending on ester type and kveik.
* Kveik produce more organic acids than Vermont Ale yeast, duplicating results from the previous Escarpment Labs study on kveik.
* Årset and Ebbegarden produced citronellol at levels similar to Vermont Ale yeast, which indicates that these cultures might be capable of biotransformation similar to the Vermont Ale strain.
* There was a trend for increased aroma intensity for some of the kveiks (Voss and Hornindal) as the pitch rate decreases. However, this is not true for Årset and Ebbegarden, where the trends were less clear.
* For the full details of this study, including the full data results, see the [https://www.escarpmentlabs.com/single-post/2019/11/01/The-impact-of-pitch-rate-on-kveik-ferments Escarpment Labs blog page] and the associated [https://www.facebook.com/groups/MilkTheFunk/permalink/3020798864614974/ MTF post].
 
White Labs also published data on their website regarding pitch rate and temperature differences for four of their kveik isolates: WLP518 (Opshaug from Stranda), WLP519 (Langlo from Stranda), WLP520 (Gjernes from Voss), and WLP521 (Raftevold from Hornindal). Four trials were conducted total, with two trials at 0.25 mil cells/mL/°P (low pitch rate) at 20°C and 32°C, and two trials at 0.75 mil cells/mL/°P (high pitch rate) at 20°C and 32°C (see [[Kveik#Temperature_and_Attenuation|pitch rate/temperature and attenuation differences]] below). They measured diacetyl and acetaldehyde differences between the four fermentations. Of the significant results, they found the following: <ref name="white_labs_experiment">[https://www.whitelabs.com/news-update-detail?id=69&type=NEWS White Labs website. "The Kveik Experiment". 05/02/2022. Retrieved 06/11/2022.]</ref>
 
* WLP518 produced higher acetaldehyde at a high pitch rate at 32°C, but not at 20°C.
* WLP519 produced higher acetaldehyde at a high pitch rate at 20°C, but the opposite was true at 32°C.
* WLP520 produced slightly more diacetyl and acetaldehyde at a high pitch rate at 20°C and 32°C.
* WLP521 produced more diacetyl at a low pitch rate at 20°C, and sightly higher at 32°C. It also produced significantly more acetaldehyde at a high pitch rate, especially at 32°C (less so at 20°C).
* White Labs reported that their sensory panel preferred the beers fermented at the warmer temperature of 32°C vs 20°C (data not published).
 
See also:
* [https://www.masterbrewerspodcast.com/156 MBAA podcast with Richard Preiss and Iz Netto from Escarpment Labs on using kveik.]
* [[Kveik#Using_Dried_Kveik_and_Viability_Over_Time|Dried kveik viability over time.]]
* [http://brulosophy.com/2019/11/25/yeast-pitch-rate-impact-of-underpitching-kveik-yeast-exbeeriment-results/ Brulosophy experiment testing pitching rate of Voss Kveik.]
 
====Temperature and Growth Rate====
While very warm fermentation temperatures have an impact on the speed of potentially attenuation of kveik, temperatures on the higher end of the scale can have a slightly negative impact on the growth rate of some kveik cultures. [https://nmbu.brage.unit.no/nmbu-xmlui/handle/11250/2681970?show=full Aasen's Master's thesis] reported that for all three kveik cultures tested (Ørjasæter, Gamlegrua, and Gausemel) the growth rate was slightly higher when incubated at 22°C and/or 30°C compared to being incubated at 37°C. They were also higher than the optimal growth of US-05. The cultures tended to reach peak cell growth at around day 2 or 3, and then experienced a slight decline until day 7, with this decline after day 2 or 3 being slightly steeper at the hotter incubation temperature of 37°C. The warmer incubation temperature of 37°C did not result in faster growth than the cooler temperatures of 22°C and/or 30°C. Therefore, for optimal growth of kveik for starters or yeast labs, a temperature of 22°C or 30°C might be optimal for some kveik cultures <ref name="Aasen" />.
 
[https://www.biorxiv.org/content/10.1101/2021.07.26.453768v1 Foster et al. (2021)] found that not only do kveik strains grow faster at higher temperatures, but they generally also survive better than typical brewing yeasts at 35-42°C. It was first postulated by the researchers that this could be due to higher glycerol production in kveik strains versus regular brewing strains, but the researchers found the kveik strains produced generally the same amount of glycerol as regular brewing strains. The researchers then discovered that the tested kveik strains produced much higher levels of trehalose, which is a carbohydrate used by yeast (and other organisms like frogs) to protect cells from freezing/thawing and higher temperatures. Unlike other brewing strains which break down trehalose at the end of fermentation, kveik keeps it. This might be at least one reason why kveik strains are able to tolerate higher temperatures (there may be other currently unknown qualities of kveik that also assist with temperature tolerance), as well as why they can tolerate drying. It might also explain why kveik begins to ferment so quickly in fresh wort. Trehalose stores also cause yeast to not take up maltotriose, and this might explain why kveik strains tend not to consume maltotriose <ref name="Foster_2021">[https://www.biorxiv.org/content/10.1101/2021.07.26.453768v1 Kveik brewing yeasts demonstrate wide flexibility in beer fermentation temperature and flavour metabolite production and exhibit enhanced trehalose accumulation. Barret Foster, Caroline Tyrawa, Emine Ozsahin, Mark Lubberts, Kristoffer Krogerus, Richard Preiss, George van der Merwe. bioRxiv 2021.07.26.453768; doi: https://doi.org/10.1101/2021.07.26.453768]</ref> (see also [https://www.facebook.com/groups/MilkTheFunk/posts/4824280584266784/ this MTF thread by Richard Preiss]).
 
====Temperature and Attenuation====
Higher fermentation temperature seems to not have a large impact on final gravity and attenuation. [https://nmbu.brage.unit.no/nmbu-xmlui/handle/11250/2681970?show=full Aasen's Master's thesis] reported statistically insignificant or minimal differences in finishing gravities at different fermentation temperatures for the three kveik cultures tested (Ørjasæter, Gamlegrua, and Gausemel):
 
{| class="wikitable sortable"
|-
! Yeast/Kveik <ref name="Aasen" /> !! Temp (°C) !! Original Gravity !! Final Gravity
|-
| rowspan="2"|Gamlegrua || 30 || 1.076 || 1.017
|-
| 37 || 1.076 || 1.018
|-
| rowspan="2"|Gausemel || 30 || 1.076 || 1.015
|-
| 37 || 1.076 || 1.017
|-
| rowspan="2"|Ørjasæter || 30 || 1.076 || 1.015
|-
| 37 || 1.076 || 1.019
|-
| rowspan="2"|US-05 || 22 || 1.076 || 1.011
|-
| 30 || 1.074 || 1.013
|-
|}
 
White Labs also reported only minor differences in final apparent attenuation and ABV for four of their kveik isolates:
 
{| class="wikitable sortable"
|-
! scope="col" style="width: 220px;" | Yeast/Kveik <ref name="white_labs_experiment" /> !! Temp (°C) !! Apparent Attenuation at 0.25 mil cells/mL/°P !! Apparent Attenuation at 0.75 mil cells/mL/°P
|-
| rowspan="2"| WLP518 (Opshaug from Stranda ) || 20 || 77.9 || 78.7
|-
| 32 || 81.1 || 82
|-
|}
 
{| class="wikitable sortable"
|-
! scope="col" style="width: 220px;" | Yeast/Kveik <ref name="white_labs">[https://www.whitelabs.com/news-update-detail?id=69&type=NEWS White Labs website. "The Kveik Experiment". 05/02/2022. Retrieved 06/11/2022.]</ref> !! Temp (°C) !! Apparent Attenuation at 0.25 mil cells/mL/°P !! Apparent Attenuation at 0.75 mil cells/mL/°P
|-
| rowspan="2"| WLP519 (Langlo from Stranda)|| 20 || 87.5 || 89.8
|-
| 32 || 90.6 || 91
|-
|}
 
{| class="wikitable sortable"
|-
! scope="col" style="width: 220px;" | Yeast/Kveik <ref name="white_labs">[https://www.whitelabs.com/news-update-detail?id=69&type=NEWS White Labs website. "The Kveik Experiment". 05/02/2022. Retrieved 06/11/2022.]</ref> !! Temp (°C) !! Apparent Attenuation at 0.25 mil cells/mL/°P !! Apparent Attenuation at 0.75 mil cells/mL/°P
|-
| rowspan="2"| WLP520 (Gjernes from Voss) || 20 || 79.9 || 80.33
|-
| 32 || 82 || 82.8
|-
|}
 
{| class="wikitable sortable"
|-
! scope="col" style="width: 220px;" | Yeast/Kveik <ref name="white_labs">[https://www.whitelabs.com/news-update-detail?id=69&type=NEWS White Labs website. "The Kveik Experiment". 05/02/2022. Retrieved 06/11/2022.]</ref> !! Temp (°C) !! Apparent Attenuation at 0.25 mil cells/mL/°P !! Apparent Attenuation at 0.75 mil cells/mL/°P
|-
| rowspan="2"| WLP521 (Raftevold from Hornindal) || 20 || 89.1 || 89.8
|-
| 32 || 89.8 || 89.8
|-
|}
 
Microbiologist and blogger Dmitri Kits [https://www.deuxkanadierbraeu.com/post/is-kveik-thermophilic-or-thermotolerant-fermentation-rates-part-1 reported a preference] for some strains of kveik for higher fermentation temperatures (35°C or 37°C) versus cooler fermentation temperatures (22°C). Both Lallemand Voss and Omega Hornindal blend fermented faster and achieved a higher attenuation at 35°C or 37°C. The Omega Lutra, however, although fermenting only slightly faster at the higher fermentation temperature versus a lower fermentation temperature of 22°C, finished at a slightly higher gravity at the warmer temperature, indicating that it might have experienced heat stress. Kits hypothesized that based on this data, some strains or kveik are thermophilic, meaning they actually prefer a warmer temperature rather than just being tolerant of it, while Lutra could be thermotolerant (tolerates higher temperatures, but prefers to ferment at a lower temperature) <ref>[https://www.deuxkanadierbraeu.com/post/is-kveik-thermophilic-or-thermotolerant-fermentation-rates-part-1 Dmitri Kits. "Are kveik thermophilic or thermotolerant: fermentation rates part 1." DEUX KANADIER BRÄU blog. 02/01/2021. Retrieved 02/03/2021.]</ref>. Kits [https://www.deuxkanadierbraeu.com/post/omega-lutra-kveik-optimum-temperature-and-performance-review later reported that the optimal fermentation temperature for Omega Labs Lutra kveik is 33-34ºC], but can still efficiently attenuate wort at temperatures as high as 40-42ºC (although the final gravity was a couple of points higher than at cooler fermentation temperatures). He reported more more acidity and astringent flavors at 40-42ºC and more body and a cleaner tasting beer at 20-28ºC with Lutra <ref>[https://www.deuxkanadierbraeu.com/post/omega-lutra-kveik-optimum-temperature-and-performance-review Dmitri Kits. "Omega Lutra kveik optimum temperature and performance review". DEUX KANADIER BRÄU blog. 05/27/2021. Retrieved 05/21/2021.]</ref>.
 
Comparing fermentation of the three kveik strains to other brewing strains (Mangrove Jack's M15 - Empire Ale, Lallemand Nottingham, Fermentis w-34/70, Lallemand Munich Classic, Mangrove Jack's M44 - West Coast, Mangrove Jack's M31 Belgian Tripel, Fermentis K97 German Ale, and Mangrove Jack's M36 Liberty Bell), Kits reported that at 18-22ºC, the three kveik cultures performed about the same as other ale yeasts, with M15 Empire Ale from Mangrove Jack's and some other ale strains completing fermentation faster than the kveik strains tested. Comparing all of the trials, Lallemand Voss was the fastest fermenting yeast when fermented at 37°C (but much slower at 22°C), followed by M15 Empire Ale from Mangrove Jack's at 22°C, and the third fastest fermentation was Omega Hornindal blend at 35°C <ref>[https://www.deuxkanadierbraeu.com/post/is-kveik-thermophilic-or-thermotolerant-fermentation-rates-part-2 Dmitri Kits. "Are kveik thermophilic or thermotolerant: fermentation rates part 2." DEUX KANADIER BRÄU blog. 02/01/2021. Retrieved 02/03/2021.]</ref>.
 
Kits reported that the optimal fermentation temperature for [https://www.deuxkanadierbraeu.com/post/escarpment-laerdal-optimum-temperature Escarpment Labs Laerdal kveik is 30°C], which is also the temperature that Dagfinn Wendelbo (the original owner) traditionally pitches this yeast at <ref>[https://www.garshol.priv.no/download/farmhouse/kveik.html#kv6 Farmhouse yeast registry; FY #6 Lærdal. Lars Marius Garshol. Retrieved 05/06/2021.]</ref>.
 
[https://www.biorxiv.org/content/10.1101/2021.07.26.453768v1 Foster et al. (2021)] published similar findings for 6 strains of kveik. All 6 strains tested (two Hornindal strains, one Laerdal strain, one Ebbegarden strain, one Granvin strain, and one Sigmund Voss strain) attenuated efficiently between 22 and 40°C. With the exception of Hornindal2, Ebbegarden, and Leardal strains, the other three kveik strains also performed well at 42°C. In comparison, none of the control strains (Cal ale, Vermont, Kolsch, and "St. Lucifer" from Escarpment Labs) attenuated well at 42°C. Out of the control strains, only the "St. Lucifer" from Escarpment Labs was able to attenuate at 40°C. This demonstrates kveiks' unique properties of being thermotolerant. The kveik strains were also generally able to ferment at lower temperatures. While most kveik strains attenuated similar to the Vermont and "St. Lucifer" controls at 15°C, Hornindal1 and Laerdal completed fermentations similar to the Kölsch and Cali strains. In addition, Hornindal1 completed a 12°C fermentation within 10 days. Overall, the kveik strains had a shorter lag phase and faster fermentation rates over a wide range of temperatures between 15-42°C, and they generally consumed glucose and maltose faster than the control strains at each of their optimal fermentation temperatures. With the exception of one of the Hornindal strains, maltotriose consumption slowed at the cooler temperatures (12°C) and was fastest with the Hornindal strains between 30-42°C. The Laerdal strain was inefficient at fermenting maltotriose (~50%) at all fermentation temperatures. In contrast, while the control strains could efficiently ferment maltotriose at their optimal fermentation temperatures (22-30°C), they were less efficient than the kveik strains outside of their optimal fermentation temperatures, once again demonstrating that some kveik strains can attenuate wort at a wider range of fermentation temperatures (both warmer and cooler) than some traditional ale strains <ref name="Foster_2021" />.
 
Foster et al. (2021) also discovered that the tested kveik strains produced much higher levels of trehalose, which is a carbohydrate used by yeast (and other organisms like frogs) to protect cells from freezing/thawing and higher temperatures. Unlike other brewing strains which break down trehalose at the end of fermentation, kveik keeps it. This might explain how kveik strains are able to tolerate higher temperatures, as well as why they can tolerate drying. It might also explain why kveik begins to ferment so quickly in fresh wort. Trehalose stores also cause yeast to not take up maltotriose, and this might explain why kveik strains tend not to consume maltotriose <ref name="Foster_2021" />.
 
====Temperature and Aromatic and Sensory Compounds====
Just as with other strains of ''Saccharomyces cerevisiae'' used in fermentation, the fermentation temperature can have a significant effect on the different aromatic and flavor compounds produced by kveik. [https://nmbu.brage.unit.no/nmbu-xmlui/handle/11250/2681970?show=full Aasen's Master's thesis] looked at fermenting three different full culture kveiks, Gamlegrua, Gausemel and Ørjasæter, and US-05 as a control. She tested three different fermentation temperatures, 22°C, 30°C, and 37°C. In general, after 7 days of incubation time, all of the yeasts had higher levels of the esters ethyl acetate, isoamyl acetate,and ethyl hexanoate at the 22°C or 30°C, and nearly half the amounts of esters at 37°C. These were esters were also measured at day 2, and at that time they were much higher in the 37°C fermentation, suggesting that prolonged exposure to the warmer temperature may have dissipated these esters. Ethyl octanoate tended to have slightly higher amounts at 22°C or 30°C, but the differences between the different fermentation temperatures were smaller, and in the case of the Gausemel kveik there was no significant different at all for this ester <ref name="Aasen" />.
 
It has been anecdotally reported by brewers that high levels of off-flavors from higher alcohols are not produced at fermentation temperatures up to 35-40°C with kveik. In general, Aasen's Master's thesis reflected these anecdotal reports. The amount of the higher alcohol 2-methyl-1-propanol was nearly double at 30°C and 37°C versus 22°C for the control yeast strain, US-05. For the three kveik cultures that were tested, Gamlegrua, Gausemel, and Ørjasæter, the amount of this higher alcohol was only slightly elevated at the higher fermentation temperatures, but still remained under the lowest levels that US-05 produced when fermented at 22°C. The higher alcohol 1-propanol had a similar trend. At 30°C and 37°C, US-05 produced significantly more of this higher alcohol, while the three kveik cultures produced only slightly elevated or the same levels regardless of fermentation temperature. The levels of 1-propanol that were produced by the three kveik cultures at all three fermentation temperatures were, in general, around the same amount that US-05 produced at 22°C. Two other higher alcohols that were measured, 2-methyl-1-butanol and 3-methyl-1-butanol, were roughly the same for all three fermentation temperatures for all three of the kveik cultures and US-05, with 2-methyl-1-butanol tending to be slightly higher in the warmer fermentation temperatures for all of the kveik cultures and US-05. One of the higher alcohols tested, 2-hexanol, had nearly double or triple the levels when fermented at the cooler temperature of 22°C versus 30°C and 37°C, indicating that this particular higher alcohol follows an opposite trend than most higher alcohols produced by yeast. The levels were the same for all three of the kveik cultures and US-05 <ref name="Aasen" />.
 
For the kveik cultures Gamlegrua and Gausemel, Aasen reported elevated levels of acetaldehyde were found at the warmer fermentation temperatures of 37°C, but not for Ørjasæter or US-05. The aldehyde 2-methyl-propanal was elevated at
37°C for all four of the cultures tested (Gamlegrua, Gausemel, Ørjasæter , and US-05). The aldehydes 2-methyl-butanal and 3-methyl-butanal, and the ketone diacetyl, were not significant for any of the cultures tested nor at any of the different fermentation temperatures (22°C, 30°C, 37°C) <ref name="Aasen" />.
 
[https://www.biorxiv.org/content/10.1101/2021.07.26.453768v1 Foster et al. (2021)] found similar findings in 5 out of 6 strains of kveik (two Hornindal strains, one Laerdal strain, one Ebbegarden strain, one Granvin strain, and one Sigmund Voss strain). Using HS-SPME-GC-MS and PCA biplot analyses to measure and plot fatty acids, ethyl esters, alcohols, and acetate esters, the researchers found that, with the exception of the Ebbegarden strain, the kveik strains grouped together while the control strains (Cal ale, Vermont, and Kolsch) grouped together (the Belgian strain "St. Lucifer" from Escarpment Labs was another control strain and formed its own flavor profile grouping). For example, octanoic acid, ethyl hexanoate (pineapple, tropical), ethyl octanoate (tropical, apple, cognac), and ethyl decanoate (apple) were all produced above threshold for all (except Ebbegarden) of the kveik strains and one control strain, the Belgian strain "St. Lucifer" from Escarpment Labs, but not the Cal ale, Vermont, and Kolsch control strains. This demonstrates that the flavor profile of many but not all kveik strains is unique from at least some typical brewing strains. The flavor profile plotting also determined that temperature played a roll in flavor with all but the Ebbegarden kveik strains clustering together at 5-42°C versus 15-22°C. For example, ethyl octanoate and ethyl decanoate were produced at the higher temperature range in the kveik strains (except Ebbegarden). The higher alcohol 1-octanol, which has a pleasant citrus character, was only produced above threshold by Cal ale and Kolsch at 15°C and Vermont at 22°C, it was produced above threshold by the kveiks and St. Lucifer strains at a much wider temperature range. Similar results were found for isoamyl acetate. Phenethyl acetate, on the other hand, was only produced above threshold by Hornindal1, Hornindal2, Laerdal and St. Lucifer regardless of temperature <ref name="Foster_2021" />. For more details on the Foster et al. (2021) study, see also [https://www.garshol.priv.no/blog/423.html Lars Garshol's blog post], study co-author [https://www.facebook.com/groups/MilkTheFunk/posts/4824280584266784 Richard Preiss's summary on MTF], and [https://brulosophy.com/podcasts/the-bru-lab/ Bru Lab Podcast Episode 031 - Kveik Fermentation Temperatures w/ Richard Preiss].
====Other Sensory Data====
* [https://docs.google.com/spreadsheets/d/1I4-xrQlr3bdBOcgfuCS92pg_3acNSvlraIxY_DiYZOM Google Spreadsheet of anecdotal experiences the fermentation characteristics and flavor of different kveik cultures (translate from Norwegian).]
* [https://www.facebook.com/groups/MilkTheFunk/permalink/2921197574575104/ Roi Krispin's project to have 16 homebrewers judge and compile flavor descriptors for beers brewed with a simple recipe and split fermentation with Sigmund Gjernes Voss, Terje Raftevold Hornindal, Tormodgarden, Ebbegarden, Framgarden, abd and Simonaitis.]
* [https://www.facebook.com/groups/MilkTheFunk/permalink/2965991863429008/ Travis Morita's experiment with a simple wort and sensory testing using DraughtLab and 7 blind tasters; kveik tested: Voss (Imperial Loki), Hornindal (Omega), Oslo (Bootleg Biology), Ebbegarden (original culture), Framgarden (original culture), and Opshaug (White Labs).]
* [http://brulosophy.com/2019/10/07/fermentation-temperature-bootleg-biology-oslo-kveik-yeast-exbeeriment-results/ Brülosophy blind triangle test of a Helles Exportbier style wort fermented with Bootleg Biology's OSLO at either 64°F/18°C or 98°F/37°C.]
====Various Interesting MTF Threads====
See also:
* [https://www.facebook.com/groups/MilkTheFunk/permalink/2101419559886247/?comment_id=2101443939883809&comment_tracking=%7B%22tn%22%3A%22R0%22%7D MTF subthread on bacterial infections in kveik.]
 
====Juniper Antimicrobial Effect====
Juniper twigs partially inhibit ''Lactobacillus'' growth. Juniper needles, ripe berries, and unripe berries have little to no significant impact. Juniper is often used in farmhouse brewing. Sometimes it is used as a mash filter, and sometimes it is used to make a juniper infusion called "einerlog" which is sometimes used for the mash water <ref name="Aasen" />. See [[Lactobacillus#Other_Plant_Type_Tolerance|''Lactobacillus'' "Other Plant Type Tolerance"]] for more information.
==Kveik Ring/Kveikstokk and Drying==
As Norwegian farmhouse brewers only brew 2-3 times per year, kveik has adapted to being dried and stored for long periods of time in-between usage, which is unique among most domesticated yeast <ref name="garshol_preiss_mbaa" />. Storing the kveik in a dried form allows the yeast to survive longer than if it is kept as a wet slurry, and might help prevent contaminants from surviving. Kveik was often dried on parchment paper and kept in bags in the freezer. Wooden carvings known as a "kveik ring" or a "kveikstokk" were also sometimes used to store dried kveik, although this might be an older practice compared to drying kveik on parchment paper. Using a kveik ring or kveikstokk is simple: drag the kveik ring (more broadly known as a "twisted torus" <ref>[https://www.academia.edu/38819003/Scandinavian_Yeast_Rings_-_the_curious_case_of_the_Twisted_Torus "Scandinavian Yeast Rings - the curious case of the Twisted Torus". Susan Verberg. 2019.]</ref>, or more specifically called a "gjærkrans" or "yeast wreath" in Norwegian when used for yeast <ref>[https://twitter.com/larsga/status/1118151239173328896 Lars Marius Garshol. Twitter feed. 04/16/2019.]</ref>) or kveikstokk through the krausen of a fermenting beer, and then hang the ring/kveikstokk to dry. On the next batch, the ring/kveikstokk is dunked into wort to reactivate the yeast <ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/1505143962847146/?comment_id=1505145579513651&reply_comment_id=1505163232845219&comment_tracking=%7B%22tn%22%3A%22R%22%7D Lars Marius garshol. Milk The Funk Facebook group post about using a kveik ring. 2017.]</ref>. Note that not all yeast reacts well to drying. Kveik has this exceptional ability. For example, ''Brettanomyces'' is known to not be tolerant of drying/desiccation <ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/2237938229567712/?comment_id=2237959286232273&comment_tracking=%7B%22tn%22%3A%22R%22%7D Justin Amaral. Milk The Funk Facebook group post on kveikstokk and drying ''Brettanomyces''. 08/16/2018.]</ref>.
 
See [[Kveik#Temperature_and_Growth_Rate|Temperature and Growth Rate]] above for a scientific explanation of why kveik can survive drying while other typical brewing yeast strains cannot.
===Drying Instructions===
* [http://mutedog.beer/blog/kveikstokk-beer/ Matt Spaanem's blog post on using a smaller kveikstokk for a wild caught yeast culture.]
* [https://homebrewingcondor.blogspot.com/2018/08/conservare-il-kveik-su-legno-kveikstokk.html Antonio Golia's write up on making and using a kveikstokk (in Italian; use an online translator).]
* [https://escarpmentlabs.com/blogs/resources/arcane-brewing-techniques-brewing-with-a-kveik-ring "Arcane Brewing Techniques: Brewing with a Kveik Ring," Escarpment Labs blog article by Jérémie Tremblay, Brasserie Independante Baleine Endiablée.]
===Using Dried Kveik, Pitching Rates, and Viability Over Time===
Dried kveik should be stored in the freezer, and has been known to be recoverable after 20 years when stored in this way. While recovery of very old dried kveik may be possible using microbiological techniques, very old dried kveik might not be viable enough for brewers to revive using simple starter techniques. [http://suigenerisbrewing.com/index.php/2019/08/28/drying-kveik-the-grand-finale Microbiologist Dr. Bryan Heit measured the viability of kveik] that was dried using a dehydrator and stored in a home freezer and found that viability decreased by about 6-8% per month. Dr. Heit estimated (and then later confirmed via cell counts) that at 6 months, the kveik would be at about 50% viability, which is good enough to pitch directly into wort without a starter. Therefore, if the kveik has been frozen for 6 months or less, dried kveik can be thawed and simply added to a liter or so of ~30°C (86°F) wort for 2-4 hours before adding that to the main batch of wort. If the dried kveik is older than 6 months, a starter is recommended. Dr. Heit used Voss kveik for his experiment, and included some limitations such as sample size, using kveik from a yeast cake instead of using fresher yeast from top cropping or a starter, using a yeast cake with a high hop content (while hops are not toxic to yeast, a high content of hops could further stress the yeast), using a dehydrator that had high and fluctuating temperatures instead of a better quality dehydrator (Dr. Heit recommends drying at 35-40°C), and probable under-estimates of viability due to using trypan blue dye, which is known to stain both dead cells and cells that are alive but are undergoing cell division <ref name="garshol_preiss_mbaa" /><ref>[http://suigenerisbrewing.com/index.php/2019/08/28/drying-kveik-the-grand-finale Dr. Bryan Heit. Sui Generis Blog post about dried kveik viability over time. 08/28/2019.]</ref>.
===Kveik Rings for Sale===
* [https://www.facebook.com/story.php?story_fbid=2013305902258162&id=1521916121397145 sudsnsawdust Tim Oelke of Suds n' Sawdust offers kveik rings in the US for sale.]* [https://jonboley.github.io/kveik-ring Jon Boley's kveik rings on Etsy.]
* [https://www.facebook.com/groups/MilkTheFunk/permalink/2464496793578520/?comment_id=2464565213571678&comment_tracking=%7B%22tn%22%3A%22R%22%7D Craft Labs in Sweden offers kveik rings off and on; contact info at craftlabs dot se.]
==Commercial Availability==
This is a summary of commercially available kveik cultures. See the above descriptions, the [http://www.garshol.priv.no/download/farmhouse/kveik.html kveik registryFarmhouse Yeast Registry], and the vendor's website for more information about the cultures. Most are single strain isolates, while some contain multiple strains or the native "unpurified" mixed cultures (this is of interest to some brewers, especially Norwegian brewers, because single isolates potentially perform differently than original cultures with multiple strains and as such will be denoted in the Notes column). Note that strain information can be misleading because the nature of kveik cultures make talking about individual strains difficult due to the strains being closely related yet diverse. Richard Preiss describes kveik cultures as being "heterogenous but related communities", meaning that there can be a lot of genetic overlap between subpopulations in a kveik culture and where one strain begins and another ends has yet to be defined (see [[Kveik#Recent_Yeast_Lab_Analysis_and_Commercial_Availability|Recent Lab Analysis]] above) <ref name="preiss_strains" />. Additionally, it is legal and quite common for yeast labs to culture strains from another yeast lab and brand them as their own, thus many single isolates are likely to be duplicates of whichever lab initially isolated them (this is unverifiable unless the yeast lab in question shares how they obtained their isolate or independent DNA sequencing is done; we include such information when it is available to us). Commercially available non-kveik landrace farmhouse yeast are listed on the [[Landrace Yeast]] page.
{| class="wikitable sortable"
! Kveik || [http://www.garshol.priv.no/download/farmhouse/kveik.html Registry Num] !! Yeast Lab !! Package !! Notes
|-
| Sigmund Gjernes's Voss || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv1 1] || [[Omega Yeast Labs]] || Voss Kveik OYL-061 || Single strain isolate. Omega Yeast Labs and The Yeast Bay independently isolated one of the strains from the Voss Kveik. It is not known if these are the same strains, or which NCYC strain they correspond to. However, they are thought to be similar in their flavor profile. [[Omega Yeast Labs]] and [[The Yeast Bay]] independently isolated one of the strains from the Voss Kveik. It is not known if these are the same strains, or which NCYC strain they correspond to. However, they are thought to be similar in their flavor profile <ref name="voss_omega_TYB">[https://www.facebook.com/groups/MilkTheFunk/permalink/1207326749295537/?comment_id=1207856785909200&reply_comment_id=1207859749242237&comment_tracking=%7B%22tn%22%3A%22R9%22%7D Conversation with Lance Shaner and Lars Marius Garshol on MTF. 01/04/2016.]</ref>.
|-
| Sigmund Gjernes's Voss || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv1 1] || [[The Yeast Bay]] || Sigmund's Voss Kveik (WLP4045 from White Labs) || Single strain isolate. Potentially the same as the Omega Yeast Labs and The Yeast Bay independently isolated one of the strains from Voss strain; see the Sigmund Gjernes's Voss Kveik. It is not known if these are the same strains, or which NCYC strain they correspond to. However, they are thought to be similar in their flavor profile. [[entry for Omega Yeast Labs]] and [[The Yeast Bay]] independently isolated one of the strains from the Voss Kveik. It is not known if these are the same strains, or which NCYC strain they correspond to. However, they are thought to be similar in their flavor profile OYL-061 above <ref name="voss_omega_TYB" />.
|-
| Sigmund Gjernes's Voss || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv1 1] || [[Mainiacal Yeast]] (DEFUNCT) || || The full, unpurified (no microbes isolated or removed) culture. Limited availability.
|-
| Sigmund Gjernes's Voss || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv1 1] || [[Escarpment Laboratories]] || Voss Kveik || Single strain isolate.
| Sigmund Gjernes's Voss || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv1 1] || [[Sleight Beer Lab]] || Gebo Nordic Yeast Pitch || Single strain isolate; sold dried.
|-
| Sigmund Gjernes's Voss || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv1 1] || [[Imperial Organic Yeast]] || Loki || A single strain isolate; likely to be the same isolate as the Omega Voss Kveik OYL-061 isolate <ref>[https://www.facebook.com/Imperialyeast/videos/322721574949175/?comment_id=322727671615232&reply_comment_id=323820638172602&comment_tracking=%7B%22tn%22%3A%22R%2311%22%7D Imperial Yeast. Facebook post on Imperial Yeast Facebook page. Retrieved 07/12/2019.]</ref>.
|-
| Sigmund Gjernes's Voss || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv1 1] || [[East Coast Yeast]] || ECY43 Nordic Farmhouse || Single strain isolate.
| Sigmund Gjernes's Voss <ref>Private correspondence with Inland Island sales staff by Dan Pixley. 04/05/2019.</ref> || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv1 1] || [[Inland Island Brewing & Consulting|Inland Island Yeast Laboratories]] || INIS-441 Norwegian Farmhouse || Single strain isolate
|-
| Sigmund Gjernes's Voss <ref>Private correspondence with Texas Cultures Laboratories sales staff by Dan Pixley. 04/05/2019.</ref> || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv1 1] || Texas Community Cultures Laboratories Yeast Lab || The Fruity Norwegian (formerly called "Kveik ", and "The Fruity Norwegian" was formerly the brand name for a different unknown kveik culture that the company removed from market <ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/2979432392084955/?comment_id=2990732884288239&reply_comment_id=2990805934280934 Mara Louise Young. Milk The Funk Facebook thread on Community Cultures Kveik cultures. 10/21/2019.]</ref>) || Single strain isolate
|-
| Sigmund Gjernes's Voss || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv1 1] || [[Propagate Lab]] || MIP-340 Voss Kveik Isolate || Single strain isolate.
|-
| Sigmund Gjernes's Voss || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv1 1] || Yeastlab (Brazil) || YLB1010 - Kveik 01 || Single strain isolate <ref>[http://www.yeastlab.com.br/produtos/ylb1010---kveik-01 Yeastlab (Brazil) website. Retrieved 10/18/2019.]</ref>.
|-
| Sigmund Gjernes's Voss || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv1 1] || Lallemand Brewing || Voss Kveik Ale Yeast || Single strain isolate <ref>[https://twitter.com/LallemandBrewUK/status/1192040024231096322/photo/2 Robert Percival. Twitter. 11/06/2019. Retrieved 11/24/2019.]</ref>. See [https://www.facebook.com/groups/MilkTheFunk/permalink/3477426352285554/?comment_id=3479035945457928&reply_comment_id=3479722155389307 this MTF comment] from a Lallemand representative regarding cell counts in this product. See [https://www.deuxkanadierbraeu.com/post/voss-kveik-optimum-fermentation-temperature "Voss kveik optimum fermentation temperature,"] for a data point on attenuation rate at different temperatures with this strain (note that this data may not be reproducable with other strains isolated from Sigmund Gjernes kveik by other yeast labs).
|-
| Sigmund Gjernes's Voss || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv1 1] || [[Kveikshop]] (DEFUNCT)|| #1 Sigmund Gjernes || The full, unpurified (no microbes isolated or removed) culture. Dried format; ships international.
|-
| Sigmund Gjernes's Voss || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv1 1] || [[Jasper Yeast]] || JY247 - Voss Kveik || Single isolate. <ref name="jasper_kveik">[https://jasperyeast.com/yeast/kveik "Kveik. Jasper Yeast Website.]</ref>
|-
| Sigmund Gjernes's Voss || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv1 1] || [[Kveik Yeastery]] || K.1 Voss || The full, unpurified (no microbes isolated or removed other than bacteria) culture. Dried format.
|-
| Rivenes || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv2 2] || [[Escarpment Laboratories]] || Rivenes Kveik || Potentially a one-time release under the lab's monthly "Kveik Ring" kveik release <ref name="escarpment_kveik_special" />.
|-
| Rivenes || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv2 2] || [[Mainiacal Yeast]] (DEFUNCT) || Dried Kveik - Rivenes || Dried format. Rivenes has the classic orange character that many Kveik has. It does have one ''Lactobacillus'' strain in the mix, but is intolerant of 10 IBU. This ''Lactobacillus'' complements the orange notes <ref>[https://www.mainiacalyeast.com/online-shop/aae5wltaw5pglrci19358w0qsrru75 "Dried Kveik - Rivenes". Mainiacal Yeast website. Retrieved 10/25/2020.]</ref>.
|-
| Stein Langlo's Stranda || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv3 3] || [[Omega Yeast Labs]] || HotHead Ale OYL-057 || Single strain isolate (only one strain was revived by NCYC).
|-
| Stein Langlo's Stranda || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv3 3] || [[Mainiacal Yeast]] (DEFUNCT) || Dried Kveik - Stranda || The full, unpurified (no microbes isolated or removed) culture. Limited availability.|-| Stein Langlo's Stranda || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv3 3] || [[Propagate Lab]] || Stranda Single Isolate || Single strain isolate (only one strain was revived by NCYC).|-| Stein Langlo's Stranda || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv3 3] || [[Kveikshop]] (DEFUNCT)|| #3 Stranda, Langlo || The full, unpurified (no microbes isolated or removed) culture. Dried format; ships international.
|-
| Terje Raftevold's Hornindal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv5 5] || [[Escarpment Laboratories]] || Hornindal Kveik Blend || Two strains isolated from the original culture.
|-
| Terje Raftevold's Hornindal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv5 5] || [[Escarpment Laboratories]] || July 2020: Hornindal Farm Kveik || The full, unpurified (no microbes isolated or removed) culture; contains lactic acid bacteria. Potentially a one-time release under the lab's monthly "Kveik Ring" kveik release <ref name="escarpment_kveik_special" /> |-| Terje Raftevold's Hornindal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv5 5] || [[Mainiacal Yeast]] (DEFUNCT) || || The full, unpurified (no microbes isolated or removed) culture; contains lactic acid bacteria. Limited availability.
|-
| Terje Raftevold's Hornindal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv5 5] || [[Omega Yeast Labs]] || Hornindal Kveik || Original culture, but "purified" to remove the lactic acid bacteria.
|-
| Terje Raftevold's Hornindal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv5 5] || [[Omega Yeast Labs]] || OYL-071 Lutra™ Kveik || Single isolate from the original Hornindal kveik; characterized as being a "shockingly clean" strain <ref>[https://omegayeast.com/news/lutra Omega Labs website. "Announcing Lutra™ Kveik, A Shockingly Clean Kveik." Retrieved 06/14/2020.]</ref><ref>[https://www.facebook.com/OmegaYeast/posts/1617613345066267?comment_id=1642734662554135&reply_comment_id=1642740209220247 Omega Labs Facebook page comment on Lutra source kveik. 10/14/2020.] </ref>. Available in dried format.
|-
| Terje Raftevold's Hornindal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv5 5] || [[Propagate Lab]] || MIP-342 Kveik Hornindal || The full, unpurified (no microbes isolated or removed) culture.
|-
| Lærdal Terje Raftevold's Hornindal <ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/2985684801459714/?comment_id=2985881488106712&reply_comment_id=2997562893605238 Breno B Jorge. Correspondance with Bio4 staff; reported in Milk The Funk Facebook group. 10/22/2019.]</ref> || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv6 6kv5 5] || [[Mainiacal Yeast]] Bio4 (Brazil) || Dried SY081 Norwegian Kveik - Laerdal || The full, unpurified (no microbes isolated or removed) culture; contains lactic acid bacteriaSingle strain isolate <ref>[http://bio4.com.br/leveduras/?tipo=all&tipo-bebida=all&estilo=all&escolha=on&keywords=kveik&codigo=&floculacao=all&atenuacao=1_100&temperatura-de-fermentacao=0_40&tolerancia-alcoolica=20# Bio4 website. Sold driedRetreived 10/18/2019. Limited availability]</ref>.
|-
| Lærdal Terje Raftevold's Hornindal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv6 6kv5 5] || [[Escarpment LaboratoriesThe Yeast Bay]] || Lærdal Hornindal Kveik || Single strain isolate. Characterized ; characterized as, "Flocculates well, and adds pineapple and orchard stone fruit aroma to beer. Ferments fast and is likely suited to hazy IPAs or English ales." Potentially a one-time release under the lab's monthly "Kveik Ringtropical esters" kveik release <ref>[https://www.instagram.com/p/B2MPLNPFnsc/ Escarpment Labs on Instagram, 09/10/2019. Retrieved 09/10/2019.]</ref>.
|-
| Terje Raftevold's Hornindal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv5 5] || [[Imperial Yeast]] || A46 Bartleby || Single isolate; characterized as "pineapple, apricot and peach aromas".|-| Terje Raftevold's Hornindal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv5 5] || [[Kveikshop]] (DEFUNCT)|| #5 Hornindal, Raftevold || The full, unpurified (no microbes isolated or removed) culture. Dried format; ships international.|-| Terje Raftevold's Hornindal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv5 5] || [[Jasper Yeast]] || JY246 - Hornindal || Single isolate; characterized as "tropical ester flavor". <ref name="jasper_kveik" />|-| Lærdal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv6 6] || [[Mainiacal Yeast]] (DEFUNCT) || Dried Kveik - Laerdal || The full, unpurified (no microbes isolated or removed) culture; contains lactic acid bacteria. Sold dried. Limited availability.|-| Lærdal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv6 6] || [[Escarpment Laboratories]] || Lærdal Kveik || Single strain isolate. Potentially a one-time release under the lab's monthly "Kveik Ring" kveik release <ref name="escarpment_kveik_special">[https://www.escarpmentlabs.com/thekveikring Escarpment Labs website, 09/10/2019. Retrieved 09/10/2019.]</ref>. |-| Hans Haugse's Granvin || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv7 7] || [[Mainiacal Yeast]] (DEFUNCT) || || The full, unpurified (no microbes isolated or removed) culture. Limited availability.|-| Sigurd Johan Saure's Tormodgarden || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv8 8] || [https://www.kveiktraining.com/online-booking/dried-kveik-8-tormodgarden-saure-1 kveiktraining.com] || Dried kveik #8 Tormodgarden / Saure || Sold by the farmhouse directly by Saure. 1 plastic bag containing approximately 15 grams of dried kveik #8 ("#8" refers to the Farmhouse Yeast Registry number). There might be some residue of the brown paper used for drying, but Saure says that it will not affect the fermentation, its all been sanitized before drying the kveik <ref>[https://www.kveiktraining.com/online-booking/dried-kveik-8-tormodgarden-saure-1 Kveik Training website. Retrieved 11/10/2019.]</ref>. |-| Sigurd Johan Saure's Tormodgarden || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv8 8] || [[Escarpment Laboratories]] || Tormodgarden Kveik || Potentially a one-time release under the lab's monthly "Kveik Ring" kveik release <ref name="escarpment_kveik_special" />.|-| Sigurd Johan Saure's Tormodgarden || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv8 8] || [[Kveikshop]] (DEFUNCT)|| #8 Tormodgarden, Saure || The full, unpurified (no microbes isolated or removed) culture. Dried format; ships international.
|-
| Ebbegarden, Stordal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv9 9] || [[Sleight Beer Lab]] || Ehwaz Nordic || Single strain isolate; sold dried.
| Ebbegarden, Stordal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv9 9] || [[Escarpment Laboratories]] || Ebbegarden Kveik Blend || Two strains isolated from Ebbegarden <ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/2593762590651939/?comment_id=2593908627304002&comment_tracking=%7B%22tn%22%3A%22R%22%7D Chris Saunders. Milk The Funk Facebook post on Escarpment Labs Ebbegarden. 04/04/2019.]</ref>.
|-
| Ebbegarden, Stordal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv9 9] || [[Mainiacal Yeast]] (DEFUNCT) || Dried Kveik - Ebbegarden || The full, unpurified (no microbes isolated or removed) culture. Limited availability.
|-
| Ebbegarden, Stordal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv9 9] || [[Propagate Lab]] || MIP-343 Kveik Ebbegarden ||
|-
| Ebbegarden, Stordal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv9 9] || [[Kveikshop]] (DEFUNCT)|| #9 Ebbegarden, Øvrebust || The full, unpurified (no microbes isolated or removed) culture. Dried format; ships international.|-| Ebbegarden, Stordal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv9 9] || [[Kveik Yeastery]] || K.9 Ebbegarden|| The full, unpurified (no microbes isolated or removed other than bacteria) culture. Dried format.|-| Framgarden, Stordal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv10 10] || [[Mainiacal Yeast]] (DEFUNCT) || || The full, unpurified (no microbes isolated or removed) culture. Limited availability.
|-
| Framgarden, Stordal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv10 10] || [[Sleight Beer Lab]] || Fehu Nordic || Single strain isolate.
| Framgarden, Stordal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv10 10] || [[Propagate Lab]] || MIP-344 Kveik Framgarden ||
|-
| Lida Framgarden, Stordal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv11 11kv10 10] || [[Mainiacal The YeastBay]] || Framgarden Kveik || Single isolate; described as "melon and cantaloupe esters". |-| Framgarden, Stordal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv10 10] || [[Escarpment Laboratories]] || Dried Framgarden Kveik || Blend of multiple isolates from the original Framgarden <ref>Private correspondence with Richard Preiss by Dan Pixley. 05/27/2020.</ref>. Potentially a one-time release under the lab's monthly "Kveik Ring" kveik release <ref name="escarpment_kveik_special" />.|-| Framgarden, Stordal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv10 10] || [[Imperial Yeast]] || A36 POG || Single isolate; described as "tropical fruit aromas". |- Lida | Framgarden, Stordal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv10 10] || [[Kveikshop]] (DEFUNCT)|| #10 Framgarden, Øvrebust || The full, unpurified (no microbes isolated or removed) culture with a strain of ''Lactobacillus''. Limited availabilityDried format; ships international.|-| Framgarden, Stordal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv10 10] || [[Mogwai Labs]] || MOG-402 Framgarden ||
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| ÅrsetLida || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv13 13kv11 11] || [[Mainiacal Yeast]] (DEFUNCT) || Dried Kveik - Årset Lida || The full, unpurified (no microbes isolated or removed) culturewith a strain of ''Lactobacillus''. Limited availability.
|-
| ÅrsetLida || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv13 13kv11 11] || [[Escarpment LaboratoriesThe Yeast Bay]] || Årset Lida Kveik Blend || Contains multiple inter-related strainsSingle isolate; see [https://www.facebook.com/groups/MilkTheFunk/permalink/2593762590651939/?comment_id=2593908627304002&reply_comment_id=2594146987280166&comment_tracking=%7B%22tn%22%3A%22R%22%7D this explanation from Richard Preiss]. Sold characterized as sourced by Jakob Årset, on the farm Årset in Eidsdal"apricot, Norway. The overall flavour profile is similar to the Hornindal Kveik Blendstone fruit, but this blend exhibits a broad temperature range (we have heard of sub-15ºC) and tolerates acidic wort quite well. Attenuation: 70-80% // Optimum Temp: 20-37ºC // Alcohol tolerance: Very High // Flocculation: Highwhite grape esters".
|-
| Lida || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv11 11] || [[Propagate Lab]] || MIP-355 Kveik Lida || |-| Årset|| [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv13 13] || [[Mainiacal Yeast]] (DEFUNCT) || Dried Kveik - Årset || The full, unpurified (no microbes isolated or removed) culture. Limited availability.|-| Årset|| [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv13 13] || [[Escarpment Laboratories]] || Årset Kveik Blend || Contains multiple inter-related strains; see [https://www.facebook.com/groups/MilkTheFunk/permalink/2593762590651939/?comment_id=2593908627304002&reply_comment_id=2594146987280166&comment_tracking=%7B%22tn%22%3A%22R%22%7D this explanation from Richard Preiss]. Sold as sourced by Jakob Årset, on the farm Årset in Eidsdal, Norway. The overall flavour profile is similar to the Hornindal Kveik Blend, but this blend exhibits a broad temperature range (we have heard of sub-15ºC) and tolerates acidic wort quite well. |-| Årset || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv13 13] || [[Jasper Yeast]] || JY224 - Arset Kveik Blend || A blend of of strains from the original Årset. Characterized as, "low ester and fast fermenting, light notes of pear and apple in low hopped beers." <ref name="jasper_kveik" />|-| Årset || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv13 13] || [[Jasper Yeast]] || JY252 Arset Kveik Single || Single isolate; characterized as "pear ester flavor". <ref name="jasper_kveik" />|-| Eitrheim || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv14 14] || [[Kveik Yeastery]] || K.14 Eitrheim || The full, unpurified (no microbes isolated or removed other than bacteria) culture. Dried format.|-| Nornes || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv15 15] || [[Mainiacal Yeast]] (DEFUNCT) || Dried Kveik - Nornes || The full, unpurified (no microbes isolated or removed) culture. Limited availability.
|-
| Nornes || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv15 15] || [[Propagate Lab]] || MIP-345 Kveik Nornes ||
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| Midtbust, Stordal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv17 17] || [[Mainiacal Yeast]] (DEFUNCT) || Dried Kveik - Midtbust || The full, unpurified (no microbes isolated or removed) culture. Limited availability.|-| Midtbust, Stordal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv17 17] || [[The Yeast Bay]] || Midtbust Kveik || Single isolate; characterized as "restrained ester profile".|-| Midtbust, Stordal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv17 17] || [[Propagate Lab]] || MIP-347 Kveik Midtbust || |-| Midtbust, Stordal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv17 17] || [[Kveikshop]] (DEFUNCT)|| #17 Midtbust || The full, unpurified (no microbes isolated or removed) culture. Dried format; ships international.|-| Midtbust, Stordal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv17 17] || [[Escarpment Laboratories]] || Nov 2020: Midtbust Kveik || A blend of 5 isolated strains from the original. Potentially a one-time release under the lab's monthly "Kveik Ring" kveik release <ref name="escarpment_kveik_special" /> |-| Nystein || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv19 19] || [[Mainiacal Yeast]] (DEFUNCT) || Dried Kveik - Nystein || The full, unpurified (no microbes isolated or removed) culture. Limited availability.|-| Espe || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv20 20] || [[Mainiacal Yeast]] (DEFUNCT) || Dried Kveik - Espe|| The full, unpurified (no microbes isolated or removed) culture. Contains ''Lactobacillus'' reportedly tolerant of up to 9 IBU. Described as spice rum/cognac character along with apricot and peach notes. Recommended fermented on the cooler side between 60-85°F. Limited availability.|-| Espe || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv20 20] || [[Omega Yeast Labs]] || OYL-090 Espe Kveik || Single strain isolate.|-| Epse || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv20 20] || [[Kveikshop]] (DEFUNCT)|| #20 Epse || The full, unpurified (no microbes isolated or removed) culture. Dried format; ships international.|-| Tomasgard || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv21 21] || [[Mainiacal Yeast]] (DEFUNCT) || Dried Kveik - Tomasgard || The full, unpurified (no microbes isolated or removed) culture, including a hop tolerant ''Lactobacillus''. Limited availability.|-| Stalljen || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv22 22] || LevTeck (Brazil) || Seljeset Kveik || The full, unpurified (no microbes isolated or removed) culture <ref>[https://www.levteck.com.br/produto/seljeset-kveik LevTeck website. Retrieved 10/18/2019.]</ref>.|-| Stalljen || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv22 22] || [[Escarpment Laboratories]] || Seljeset Kveik || Four isolates from the original culture. Reportedly one of the fastest fermenting kviek. Potentially a one-time release under the lab's monthly "Kveik Ring" kveik release <ref name="escarpment_kveik_special" />. |-| Stalljen || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv22 22] || [[Propagate Lab]] || MIP-348 Kveik Stalljen || |-| Stalljen || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv22 22] || [[Mainiacal Yeast]] (DEFUNCT) || Dried Kveik - Stalljen || The full, unpurified (no microbes isolated or removed) culture. The culture presents citrus forward with floral notes in the back round. It also can have a caramel or toffee like character to it as well. Dried format. Limited availability. |-| Stalljen || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv22 22] || [[Kveik Yeastery]] || K.22 Stalljen || The full, unpurified (no microbes isolated or removed other than bacteria) culture. Dried format.|-| Otterdal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv23 23] || [[Kveikshop]] (DEFUNCT)|| #23 Otterdal, Grodås || The full, unpurified (no microbes isolated or removed) culture. Dried format; ships international.|-| Otterdal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv23 23] || [[Kveik Yeastery]] || K.23 Otterdal|| The full, unpurified (no microbes isolated or removed other than bacteria) culture. Dried format.|-| Halvorsgard || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv28 28] || [[Escarpment Laboratories]] || Halvorsgard || Two isolates from the original kveik. Contains POF+ trains, strong fruity aromas with a light "baking spice". Potentially a one-time release under the lab's monthly "Kveik Ring" kveik release <ref name="escarpment_kveik_special" />.
|-
| Nystein Ner-Saure || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv19 19kv31 31] || [[Mainiacal Yeast]] (DEFUNCT) || Dried Kveik - Nystein Ner-Saure || The full, unpurified (no microbes isolated or removed) culture. Dried format. Characterized as having a burnt citrus character and fresh baked bread notes. This culture also has a ''Lactobacillus'' in that that is a bit more tolerant around 12 IBU <ref>[https://www.mainiacalyeast.com/online-shop/dried-kveik-ner-saure "Dried Kveik - Ner-Saure". Limited availabilityMainiacal Yeast website. Retrieved 10/25/2020.]</ref>.
|-
| Tomasgard Wollsæter || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv21 21kv35 35] || [[Mainiacal Yeast]] (DEFUNCT) || Dried Kveik - Tomasgard || The full, unpurified (no microbes isolated or removed) culture, including a hop tolerant ''Lactobacillus''. Limited availability.
|-
| Wollsæter || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv35 35] || [[Mainiacal YeastKveikshop]] (DEFUNCT)|| #35 Wollsaeter || The full, unpurified (no microbes isolated or removed) culture. Limited availabilityDried format; ships international.
|-
| Aurland || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv38 38] || [[Propagate Lab]] || MIP-341 Kveik Auland || The full, unpurified (no microbes isolated or removed) culture. May contain bacteria.
|-
| Skare Aurland || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv41 41kv38 38] || [[Mainiacal Yeast]] (DEFUNCT) || Dried Kveik Farmhouse - Skare Auland || The full, unpurified (no microbes isolated or removed) culture. Limited availabilityPotentially POF+, and contains a species of ''Candida''.
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| Skare || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv41 41] || [[Mainiacal Yeast]] (DEFUNCT) || Dried Kveik - Skare || The full, unpurified (no microbes isolated or removed) culture. Limited availability.|-| Skare || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv41 41] || [[Escarpment Laboratories]] || Skare kveik || Pronounced "scar-uh". Blend of 3 isolated strains from skare kveik. Potentially a one-time release under the lab's monthly "Kveik Ring" kveik release <ref name="escarpment_kveik_special" />|-| Skare || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv41 41] || [[Escarpment Laboratories]] || KRISPY || Pronounced "scar-uh". Single isolate. KRISPY can be used to make clean, lager-like beers in a fraction of the time since fermentations can be performed in the 20-30ºC range. Note: Attenuation tends to be slightly lower than some lager strains, so aim to make a highly fermentable wort if you are targeting a dry finish <ref>[https://escarpmentlabs.com/products/krispy Escarpment Labs website. Krispy. Retrieved 08/07/2021.]</ref>. |-| Skare || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv41 41] || [[Kveikshop]] (DEFUNCT)|| #41 Skare || The full, unpurified (no microbes isolated or removed) culture. Dried format; ships international.|-| Opshaug || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv43 43] || [[Mainiacal Yeast]] (DEFUNCT) || Dried Kveik - Opshaug || The full, unpurified (no microbes isolated or removed) culture. Limited availability.
|-
| Opshaug || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv43 43] || [[White Labs|White Labs]] || WLP518 || Single strain isolate <ref>[https://www.facebook.com/photo.php?fbid=2252054921723605&set=p.2252054921723605&type=3&permPage=1 Allen Stone. Image of a White Labs poster. 04/14/2019.]</ref>.
|-
| Hovden Opshaug || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv48 48kv43 43] || [[Mainiacal YeastPropagate Lab]] || Dried Kveik MIP-352 Osphaug || |- Hovden | Opshaug || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv43 43] || [[Kveikshop]] (DEFUNCT)|| #43 Opshaug || The full, unpurified (no microbes isolated or removed) culture. Dried format; ships international.|-| Jordal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#k44 44] || [[Escarpment Laboratories]] || Jordal Kveik || Blend of 4 isolates from the original Jordal. Limited availabilityPotentially a one-time release under the lab's monthly "Kveik Ring" kveik release <ref name="escarpment_kveik_special" />.
|-
| Jordal || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv44 44] || [[Mainiacal Yeast]] (DEFUNCT) || Farmhouse - Jordal || The full, unpurified (no microbes isolated or removed) culture. Limited availability. It contains a mix of 3 ''Saccharomyces cerevisiae'' strains and 2 hop intolerant (tolerates 9-10 IBU) ''Lactobacillus'' strains.|-| Hovden || [http://www.garshol.priv.no/download/farmhouse/kveik.html#kv48 48] || [[Mainiacal Yeast]] (DEFUNCT) || Dried Kveik - Hovden || The full, unpurified (no microbes isolated or removed) culture. Limited availability.|-| Ebbegarden, Framgarden, Lida, Raftevold gård, and Wollsæter (blend) || || [[Mainiacal Yeast]] (DEFUNCT) || Kveik the World Blend || Kveik blend dedicated to the late William Holden who created the Kornolfetsival to showcase kveik and helped trade kveik with brewrs outside of Norway. Each selected kveik was collected by William Holden. A portion of the proceeds from each sale will go to William's family. Contains hop intolerant strains of ''Lactobacillus'' (5-10 IBU will inhibit sour flavor).
|-
| Hornindal, Voss, Ebbegarden, and Årset (blend) || || [[Escarpment Laboratories]] || Kveik The World Blend || Different than the Mainiacal culture of the same name. This was a promotional blend that was handed out for free at HomebrewCon 2019, but the company might hand it out again at future events <ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/2860514460643416/?comment_id=2860552537306275&reply_comment_id=2860698297291699&comment_tracking=%7B%22tn%22%3A%22R%22%7D Richard Preiss. Milk The Funk Facebook thread on Escparment Labs "Kveik the World blend". 08/20/2019.]</ref>.
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| Unknown || || [[Bootleg Biology]] || OSLO || Single strain isolate. Isolated from [https://www.instagram.com/eikogtid/ Eld & Tid's] house culture which is a mix of three kveik cultures from Hornindal (thus the exact original kveik that this isolate comes from is not known) <ref name="Mello_Kveik">Jeff Mello. Personal correspondence with Dan Pixley. 03/07/2019.</ref>. See [https://www.facebook.com/groups/MilkTheFunk/permalink/2638723966155801/?comment_id=2641061075922090&reply_comment_id=2641833972511467&comment_tracking=%7B%22tn%22%3A%22R%22%7D this MTF thread] on speculating which kveik this isolate could be from. It has been confirmed via ITS sequencing that this strain is within the kveik family but not which kveik culture it comes from <ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/2823938030967726/?comment_id=2823943070967222&reply_comment_id=2824364994258363&comment_tracking=%7B%22tn%22%3A%22R%22%7D Richard Preiss. Milk The Funk post on ITS sequencing OSLO. 08/-02/2019.]</ref>. See also:* [https://www.facebook.com/groups/MilkTheFunk/permalink/3261798840514974/ Levi Fried's fermentation data for OSLO.]|-| Unknown || || [[Bootleg Biology]] || AURORA || Single strain isolate. Isolated from one of the kveik cultures from Hornindal (the specific kveik culture from Hornindal, of which there are a few, is unknown to Bootleg Biology) <ref name="Mello_Kveik" />.|-| Unknown || || [[Imperial Yeast|Imperial Yeast]] || A44 Kveiking || A blend of three isolated strains. The origin of the three strains is proprietary <ref>[https://www.facebook.com/Imperialyeast/photos/a.683712355073022/2158076584303251/?type=3&comment_id=2158478724263037&reply_comment_id=2159161367528106&comment_tracking=%7B%22tn%22%3A%22R%22%7D Imperial Yeast Facebook post. 06/27/2019.]</ref>.|-| Unknown (blend) || || [[Mainiacal Yeast]] (DEFUNCT) || Dried Kveik Blend - Juggernaut || A blend of 6 different ''Saccharomyces cerevisiae'' strains isolated from 6 different kveik. Characterized as "very fruity". Limited availability.
|-
| Unknown (blend) || || [[Mainiacal Yeast]] (DEFUNCT) || Dried Kveik Blend - Berserker || A blend of 3 different ''Saccharomyces cerevisiae'' strains isolated from 3 different kveik. Characterized as "citrusy". Limited availability.
|-
| Unknown || || [[Bootleg BiologyMogwai Labs]] (Australia) || OSLO MOG-401 Sunshine || Single strain A single isolate. Isolated from [https://www.instagram.com/eikogtid/ Eld & Tid's] house culture which is a mix of multiple kveik cultures from Hornindal (thus the exact original kveik that this isolate comes from is not known) <ref name=produces clean "Mello_Kveiklager-like">Jeff Mello. Personal correspondence with Dan Pixley. 03/07/2019.</ref>. See [https://www.facebook.com/groups/MilkTheFunk/permalink/2638723966155801/?comment_id=2641061075922090&reply_comment_id=2641833972511467&comment_tracking=%7B%22tn%22%3A%22R%22%7D this MTF thread] on speculating which kveik this isolate could be from. It has been confirmed via ITS sequencing that this strain is within the kveik family but not which kveik culture it comes from <ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/2823938030967726/?comment_id=2823943070967222&reply_comment_id=2824364994258363&comment_tracking=%7B%22tn%22%3A%22R%22%7D Richard Preiss. Milk The Funk post on ITS sequencing OSLO. 08/-02/2019.]</ref>beers.
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| Unknown || || [[Bootleg BiologyPropagate Lab]] || AURORA MIP-354 Oslo || Single strain isolate. Isolated from one of Most likely the kveik cultures from Hornindal (same as the specific kveik culture from Hornindal, of which there are a few, is unknown to [[Bootleg Biology) <ref name="Mello_Kveik" />]] OSLO.
|-
| Unknown || || [[Imperial Organic YeastWHC Lab (Ireland) |Imperial Yeast]] |Ubbe | A44 Kveiking || A blend of three Clean "lager-like" taste and aroma. Single strain isolated strainsfrom the Hornindal region in Norway <ref name="whc_kveik">[https://www.whclab.com. WHC website. Retrieved 08/02/2019.]</ref>. The origin of This is reported to be the three strains is proprietary same strain as Bootleg Biology's OSLO product <ref>[https://www.facebook.com/Imperialyeastgroups/photosMilkTheFunk/a.683712355073022permalink/21580765843032513208323079195884/?type=3&comment_id=2158478724263037&reply_comment_id=2159161367528106&comment_tracking=%7B%22tn%22%3A%22R%22%7D Imperial Yeast Correspondance with Philip Nutt. Milk The Funk Facebook group poston WHC Labs' Ebbe kveik strain. 0601/2714/20192020.]</ref>.
|-
| Unknown || || WHC Lab (UKIreland) || Ubbe Bjorn || Clean "lager-like" taste and aroma. Single strain isolated isolate from the Hornindal region in Norway . Characterized as fruity <ref name="whc_kveik">[https://www.whclab.com. WHC website. Retrieved 08/02/2019.]</ref>.
|-
| Unknown || || WHC Lab (UKIreland) || Bjorn Lagertha || Single strain isolate from the Hornindal Stranda region in Norway. Characterized as fruity <ref name="whc_kveik" />. Editor's note: this is likely the same strain as Omega HotHead.
|-
| Unknown || || WHC Lab (UKIreland) || Lagertha Odin || Single strain isolate from Lightly fruity; ferments in the Stranda region in Norway. Discrete tropical fruit notes with banana and honey coming through. Produces some light funky notes lower 20's °C <ref name="whc_kveik" />. Editor's note: this is Most likely the same a single strain as Omega HotHeadisolate.
|-
| Unknown || || WHC Lab (UKIreland) || Odin Ragnar || Lightly fruity; ferments Single strain isolate from the Voss region in the lower 20's °C Norway <ref name="whc_kveik" />. Most Editor's note: this is likely a single the same strain isolateas Omega Voss.
|-
| Unknown || || WHC Lab (UKIreland) || Ragnar Valkryie || Single A yeast strain isolated from a kviek isolate from the Voss Ebbegarden region in Norway(most likely [http://www.garshol.priv.no/download/farmhouse/kveik. Characterized as "citrusy" html#kv9 #9 on the registry] <ref name="whc_kveik" />. Editor's note: this is likely the same strain as Omega Voss.
|-
| Unknown || || WHC Lab (UK) [[White Labs]] || Valkryie WLP631 || A yeast strain isolated from a kviek isolate from Ebbegarden region in Norway (most likely [http://www.garshol.priv.no/download/farmhouse/blend of several unnamed strains of kveik.html#kv9 #9 on the registry]. Characterized as fruity <ref name="whc_kveik" />and an unnamed ''Lactobacillus'' species.
|-
|}
'''See [[Landrace Yeast]] for more information and commercially available cultures.'''
 
===Hybrid Strains===
* [https://escarpmentlabs.com/en-us/blogs/resources/yeast-fusion-the-story-of-jotunn "Yeast fusion: the story of JÖTUNN" Escarpment Labs blog.]
* [https://www.youtube.com/watch?v=GJYk0LjlxFo "Hybrid Exploration in Kveik Yeast" Chop & Brew YouTube channel.]
==Specific Kveik Culture Information==
See the [http://www.garshol.priv.no/download/farmhouse/kveik.html Farmhouse Yeast Registry maintained by Lars Garshol] for more complete and updated information on individual kveik cultures.
===Sigmund Gjernes's Voss Kveik===
====Tips For Use====
* [https://www.facebook.com/groups/MilkTheFunk/permalink/1230684866959725/?comment_id=1237755416252670&comment_tracking=%7B%22tn%22%3A%22R%22%7D Tips from Andrew Rathband and Lars Garshol on MTF.]
* [https://docs.google.com/spreadsheets/d/1I4-xrQlr3bdBOcgfuCS92pg_3acNSvlraIxY_DiYZOM/edit#gid=0 Community spreadsheet tracking fermentation characteristics of many kveik cultures.]
* [http://ryanbrews.blogspot.com/2016/10/norwegian-table-beer-review.html Ryan Brews Blog; Norwegian Table Beer review using The Yeast Bay's Voss Kveik.]
* See also the [[Saccharomyces]] page for vendor tips.
* [https://www.facebook.com/groups/MilkTheFunk/permalink/2279294785432056/ Experiences with high ABV/braggots.]
* [https://www.facebook.com/groups/MilkTheFunk/permalink/2323341917694009/ Tips for using kveik in hoppy beers.]
 ===Svein Rivenes's Voss * Practical Guide to Kveik=== Brewer Svein Rivenes deposited a sample of kveik in 2009 via Håken Hveem. No bacterial contamination was found <ref name="kveik_testing"></ref>. Seven strains were isolated from the blend.and Other Farmhouse Yeast by author Mika Laitinen:* [https://catalogue.ncyc.co.uk/saccharomyces-cerevisiae-3545 NCYC 3545 - original sample of kveik containing seven strains of ''S. cerevisiae''.] * [https://cataloguewww.ncycbrewingnordic.co.ukcom/saccharomyces-cerevisiae-3546 NCYC 3546 farmhouse- 1st isolate in the 3545 blend.]* [https://catalogue.ncyc.co.ukales/saccharomycespractical-cerevisiaeguide-3547 NCYC 3547 to- 2nd isolate in the 3545 blend.]* [https://catalogue.ncyc.co.uk/saccharomyceskveik-cerevisiaefarmhouse-3547 NCYC 3548 yeast- 3rd isolate in the 3545 blend.]* [https:introduction//catalogue.ncyc.co.uk/saccharomyces-cerevisiae-3549 NCYC 3549 - 4th isolate in the 3545 blend."Introduction"]* [https://catalogue.ncyc.co.uk/saccharomyces-cerevisiae-3550 NCYC 3550 - 5th isolate in the 3545 blend.]* [https://catalogue.ncycwww.cobrewingnordic.ukcom/saccharomycesfarmhouse-cerevisiae-3551 NCYC 3551 - 6th isolate in the 3545 blend.]* [https:ales//catalogue.ncyc.co.uk/saccharomycespractical-cerevisiaeguide-3552 NCYC 3552 to- 7th isolate in the 3545 blend.] ===John Nornes's Voss Kveik=== Martin Warren collected a sample from brewer John Nornes in Voss in 2015. The kveik has been analyzed by NCYC, but the strains have not been assigned numbers yet. ===Stein Langlo's Stranda Kveik=== * [https://catalogue.ncyc.co.uk/saccharomyces-cerevisiaefarmhouse-4021 NCYC 4021 yeast- Only one strain of ''S. cerevisiae'' could be revived from this kveik.] <ref name="kveik_testing">[http:/fermentation/www.garshol.priv.no/blog/329.html "Kveik testingFermentation". Larsblog. 05/05/2014. Retrieved 01/20/2016.]</ref> ===Terje Raftevold's Hornindal Kveik=== Terje's kveik was mixed with 2-3 other kveiks. This probably explains the wider variety of isolated strains. It also contains bacteria, and these bacteria seem to be contributing positively to the aroma (and they don't sour the beer). See [http://www.garshol.priv.no/blog/329.html "Kveik testing"] and [http://www.garshol.priv.no/blog/343.html "Hornindal: interviews and collecting kveik"] on Larsblog for more information. * [https://catalogue.ncyc.co.uk/saccharomyces-cerevisiae-4051 NCYC 4051 - the original sample of kveik containing eight strains of ''S. cerevisiae''.] * [https://cataloguewww.ncycbrewingnordic.co.ukcom/saccharomycesfarmhouse-cerevisiae-4058 NCYC 4058 - 1st isolate in the 4051 blend.]* [https://catalogue.ncyc.co.ukales/saccharomycesfarmhouse-cerevisiae-4060 NCYC 4060 yeast- 2nd isolate in the 4051 blend.]* [https:descriptions//catalogue.ncyc.co.uk/saccharomyces-cerevisiae-4063 NCYC 4063 - 3rd isolate in the 4051 blend."Farmhouse Yeast Descriptions"]* [https://catalogue.ncyc.co.uk/saccharomyces-cerevisiae-4064 NCYC 4064 - 4th isolate in the 4051 blend.]* [https://cataloguewww.ncycbrewingnordic.co.ukcom/saccharomyces-cerevisiae-4067 NCYC 4067 farmhouse- 5th isolate in the 4051 blend.] * [https://catalogue.ncyc.co.ukales/saccharomycespractical-cerevisiaeguide-4068 NCYC 4068 to- 6th isolate in the 4051 blend.]* [https://catalogue.ncyc.co.uk/saccharomyceskveik-cerevisiaeand-4069 NCYC 4069 other- 7th isolate in the 4051 blend.]* [https://catalogue.ncyc.co.uk/saccharomycesfarmhouse-cerevisiaeyeast-4070 NCYC 4070 reusing- 8th isolate in the 4051 blend.] ===Olav Gausemel's Hornindal Kveik=== This is the kveik Terje Raftevold's kveik branched off from in the 1990s. Olav says he has mixed it with other kveiks 1-2 times in the meantime. It was collected for comparison purposes. Little is known about this kveik, but it is described in Rasmussen's thesis. ===The Lida kveik=== From Samuel Lien in Grodås, Hornindal. Collected by William Holden. Samuel got the kveik from Hans Øen, who moved from Hornindal from Faleide in Stryn, so the yeast is originally from Stryn. Øen is dead, but Lien is alive. Pitch temperature 30. ===Lars Andreas Tomasgard, Hornindal=== Lars Marius Garshol collected this from Lars Andreas at the Kornøl Festival. More information needed. ===Dagfinn Wendelbo's Lærdal kveik=== Arvid Solheim collected this kveik from Dagfinn Wendelbo at Ljøsne in Lærdal. Wendelbo lost his own kveik a couple of years ago, and got this from Per Gjermann. As far as I understand it originates with Gjermann, from the farm Stødno in Lærdal. ===Hans Haugse's Granvin kveik=== Originates from Hans Haugse from Granvin, Hardanger, via Einar Vestrheim and Lars Olav Muren. NCYC analysis indicates that it contains both Pichia and Saccharomyces. ===Sigurd Johan Saure's Sykkylven kveik=== Originates with brewer Sigurd Johan Saure, at Tormodgarden in Aurdal in Sykkylven. Sigurd says the yeast has definitely been reused since his great-greatmaintaining-grandfather's time. His great-grandfather mixed it with another yeast from a friend in the 1950s, after the yeast "got weak". Collected, but not sent Practical Guide to the NCYC yet.Kveik and Other Farmhouse Yeast: Reusing and Maintaining Yeast]
===Ebbegarden, Stordal===
Appears to have an unusual relationship with hops, so beware that this yeast may accentuate the hop bitterness in your beers. Jens says he only dry-hops himself. Richard Preiss from [[Escarpment Laboratories]] reported that sensory data on how bitter beer tastes with Ebbegarden kveik versus other yeast strains (Hornindal kveik and Conan strain) is that it produces a slightly more bitter beer, but the effect is not big <ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/2397563676938499/?comment_id=2399642916730575&comment_tracking=%7B%22tn%22%3A%22R%22%7D Richard Preiss. Milk The Funk Facebook group thread on the bitterness produced by Ebbegarden kveik. 12/04/2018.]</ref>.
===Framgarden, Stordal=== From Petter B Øvrebust at a neighbouring farm in Stordal. Collected by William Holden. Petter still brews raw ale, pitches at 30C, ferments 2-3 days. ===Midtbust, Stordal=== From Odd H Midtbust at a third farm in Stordal, collected by Lars Marius Garshol. Jens Aage Øvrebust says this yeast is pitched at 33C, and that it should be kept at this temperature during fermentation. Usually ferments about 3 days. Midtbust harvests the yeast from the top. ===Jarle Nupen, Eidsdal=== Jarle brought this kveik to the Kornøl Festival, where he gave it to Lars Marius Garshol. Jarle originally got the yeast from Tore Hjelle in Eidsdal in 1979-1980, so the yeast comes from Eidsdal. Jarle has kept the yeast ever since, and he says "I've watched it like gold." Jarle pitches at 31 degrees, and doesn't want the fermentation to go above 36 degrees. He ferments roughly 30 hours. ===Jakob Torp Årset, Geiranger=== Jakob brought this kveik to the Kornøl Festival, where he gave it to Lars Marius Garshol. More information needed. ===Eitrheim-kveiken, Hardanger=== Jakob Eitrheim, born 1920, has been using this kveik in Bleie since the 1950s. He says he got it from his grandfather, who lived at Eitrheim (now part of the town of Odda), but he doesn't know where it came from before that. So he claims to know the history of the yeast back to the late 19th century. Jacob ran out of yeast in the late 1950s, and got new yeast from his brother, who had the same kveik. The yeast is pitched at 37C, and harvested from the bottom. The Eitrheim family dry it and keep it in glasses. They usually ferment 3-4 days. ===Wollsæter=== Jørgen Wollsæter's kveik culture. ==Relevant Larsblog Posts and MTF ContentFarmhouse Brewing Resources==
===MTF "The Podcast"===
* [http://www.garshol.priv.no/blog/380.html "Kveik" - what does it mean?]
* [http://www.garshol.priv.no/blog/393.html How To Use Kveik.]
* [http://www.garshol.priv.no/download/farmhouse/kveik.html Kveik Farmhouse Yeast Registry.]
* [http://www.garshol.priv.no/blog/378.html A family tree of kveik] - Summary of Richard Preiss and Carolina Tyrawa's genetic research on kveik strains.
* [http://www.garshol.priv.no/blog/349.html Analysis of farmhouse yeast (kveik)] - overview of master thesis by Truls C. Rasmussen that characterizes several kveik yeast species/strains.
* [http://www.garshol.priv.no/blog/343.html Hornindal: interviews and collecting kveik] - An attempt by Lars to collect three more samples of kveik which would not grow in the lab.
* [http://www.garshol.priv.no/blog/329.html Kveik testing] - Lars brews using 5 different samples of kveik he's collected, and compares tasting notes.
* [https://brulosophy.com/podcasts/the-bru-lab/episodes-001-to-100/ The Brü Lab Episode 033 - Kveik History & Genetics w/ Lars Marius Garshol.]
* [https://brulosophy.com/podcasts/the-bru-lab/episodes-001-to-100/ The Brü Lab Episode 031 - Kveik Fermentation Temperatures w/ Dr. Richard Preiss.]
* [http://thebrulab.libsyn.com/episode-086-fermentation-times-in-traditional-farmhouse-brewing-w-lars-marius-garshol The Brü Lab Episode 086 - Kveik Fermentation Times w/ Lars Marius Garshol.]
===Raw Ale===
* [http://www.garshol.priv.no/blog/331.html Raw ale] - Definition of "raw ale", and the methods used to brew it in historical and traditional farmhouse brewing.
* [https://www.brewingnordic.com/new-nordic-beer/raw-ale/ "Brewing Modern Raw Ales," Brewing Nordic blog.]
 
===Norwegian Farmhouse Ale (Maltøl)===
* [http://www.garshol.priv.no/blog/402.html Garshol's English book, "Historical Brewing Techniques" in English, 2020.]
* [http://www.garshol.priv.no/blog/330.html Norway: climate and ingredients] - Survey analysis of the distribution of brewing malts in traditional Norwegian farmhouse ale.
* [https://www.facebook.com/groups/MilkTheFunk/permalink/1900931633268375/ MTF thread on species of juniper to use for farmhouse styles beers, and which are poisonous.]
* [https://www.brewingnordic.com/farmhouse-ales/heimabrygg-vossaol-farmhouse-homebrews-western-norway/ "Heimabrygg, Vossaøl, Hardangerøl and Sognøl – The Farmhouse Homebrews of Western Norway," by Mika Laitinen.]
===Farmhouse Ale in Other Countries===
* [http://www.garshol.priv.no/blog/394.html "How to Brew Keptinis", a Lithuanian style of farmhouse ale using baked bread our of mash grains.]
** See also this [https://www.facebook.com/groups/MilkTheFunk/permalink/2319796291381905/ MTF thread] on experiences of MTF members brewing this style of beer.
* Mika Laitinen's talk "Taari, Karelian Farmhouse Ale" at Kornølfestival 2022:
: <youtube>Z-G5v6FM380</youtube>
 
===General Farmhouse Brewing===
* [https://www.brewingnordic.com/new-nordic-beer/brewing-with-juniper-spruce-fir-pine "Brewing With Juniper, Spruce, Fir and Pine," by author Mika Laitinen Part 1] and [https://www.brewingnordic.com/new-nordic-beer/brewing-techniques-juniper-spruce-fir-and-pine/ Part 2].
* [https://www.facebook.com/groups/MilkTheFunk/posts/5245843675443804 MTF post from farmhouse brewer Jørund Geving on how to build a temporary såinn house (smoke house) for making traditional smoked Stjørdalsmalt.]
 
===Kornølfestival===
There is an annual festival created by the late William Holden celebrating the cultural traditions of European farmhouse brewing called the [https://www.norskkornolfestival.no/english/ Kornølfestival]. The festival is held in Hornindal, Norway in October with bus and hotel accommodations for visiting attendees.
 
* [https://www.crowdcast.io/e/norsk-kornlfestival-2020/1 Watch the 2020 Kornølfestival Session 1] and [https://www.crowdcast.io/e/norsk-kornlfestival-2020/2 Session 2].
** Youtube version: [https://www.youtube.com/watch?v=eTDX6fds7EU Session 1] and [https://www.youtube.com/watch?v=LNIbYj_J2QI Session 2].
** [https://medievalmeadandbeer.wordpress.com/2020/10/26/stig-seljeset-and-friends-brew-a-traditional-hornindal-kornol-as-part-of-the-norsk-kornolfestival-2020 Susan Verberg's informational highlights for the festival Part 1], [https://medievalmeadandbeer.wordpress.com/2020/10/27/roar-sandodden-and-friends-brew-a-stjordalsol-as-part-of-the-norsk-kornolfestival-2020/ Part 2], and [https://medievalmeadandbeer.wordpress.com/2020/10/30/kjetil-dale-and-friends-brew-vossaol-as-part-of-the-norsk-kornolfestival-2020/ Part 3].
 
* Chop n Brew interview with Lars Marius Garshol and Stig Jarle Seljeset about the festival:
: <youtube>1hwIJYvTnII</youtube>
 
* [https://www.youtube.com/watch?v=DT4V-f9dklw&list=PLl9aD1C8MmGEPPi25mtWiD3YGsq_b__vb 2021 Kornølfestival clips on Bård Romar Hoveid's YouTube channel.]
 
* Updates to Kveik research by Lars Marius Garshol at Kornølfestival 2022:
: <youtube>g_Qnkh6c1cU</youtube>
 
* 2023 Kornølfestival presentations in English:
: <youtube>AuaGT2wYxNw</youtube> <youtube>uLhHGAlWyQI</youtube> <youtube>GWkPvOwQmMc</youtube>
==General Videos==
* [https://www.facebook.com/notes/kveik/filmer-med-tradisjons-inspirasjonar/1554720841250054/ List of videos formerly maintained by the late William Holden in the Kveik Facebook group.]
* [https://www.facebook.com/pg/Vasstronde/videos/?ref=page_internal Ivar A. Geithung's historic family farmhouse (Vasstrond'e Småbryggjarlaug).]
* [https://vimeo.com/156659003 Terje Raftevold in Hornindal brewing raw farmhouse ale with kveik.]
* [https://tv.nrk.no/program/fola00000273/-drik-venner-kjaere-mitt-oel-velunt-skal-vaere-drikk-venner-kjaere "Drink friends old and dear, my ale shall bring good cheer". (video is about brewing traditional Norwegian Farmhouse beer in Hardanger, audio is in Norwegian)]
* [https://www.crowdcast.io/e/demystifying-kveik-yeast Richard Preiss's presentation and Q&A on kveik on the Doug Piper Crowdcast; 03/04/2020.]
* [https://www.crowdcast.io/e/kveik-lars-garshol Lars Marius Garshol's presentation and Q&A on kveik and farmhouse brewing on the Doug Piper Crowdcast; 04/15/2020.]
* [https://www.youtube.com/watch?v=2eTl2uK-eV8 Interview with Lars Marius Garshol on the Escarpment Labs youtube channel with Richard Preiss; 04/20/2020.]
* [https://www.crowdcast.io/e/n2kbq0af Lars Marius Garshol presentation on farmhouse brewing for the Brewers Association; May 2020.]
* [https://www.youtube.com/watch?v=Ifwdvsgi3qw&list=PL5OhY6FaSPwfVVyV1cfU4eDJCYi_vNjs4 Homebrewing Condor playlist on how to use kveik (in Italian).]
* Steps to making a Kornøl (Norwegian farmhouse ale) with Terje Raftevold (English subs):
: <youtube height="200" width="300">Cl9NZ7gV9so</youtube>
* Traditional farmhouse malting and brewing, from Aurland, Sogn (audio is in Norwegian, but the imagery is still worthwhile if you do not understand Norwegian):
: <youtube height="200" width="300">vvV6657b2NY</youtube>
* Brewing with the elusive Hornindal-strain, done old school, no boiling, 2 days fermenting:
: <youtube height="200" width="300">6InOfER2mic</youtube>
* Ivar A. Geithung making farmhouse ale at Vasstrond'e Småbryggjarlaug in Voss, Norway:
: <youtube height="200" width="300">jQdPR0oF-HI</youtube>* Traditional Latgalian STONE BEER With Brewer Jānis Maļkevičs, Dagda/Kraslava Municipality ([https://www.facebook.com/groups/MilkTheFunk/permalink/5369164439778393/ associated MTF thread]):: <youtube>XHlfKD5umnQ</youtube>
* RåØl (Raw Beer) Brewday with John Palmer at [https://www.facebook.com/eiktid/ EIK og TID]:
: <youtube height="200" width="300">ww0QAtCrirc</youtube>
* Presentation by Lars Marius Garshol (in Norwegian):
: <youtube height="200" width="300">cJXPxvm0UZc</youtube>
* Omega Yeast Labs presentation on farmhouse brewing and using kveik:
: <youtube height="200" width="300">7HVms3HSc9I</youtube>
* Presentation on kveik with Lance Shaner from Omega Yeast Labs, Damian Fagan, co-founder of Almanac Beer Co, and Chris Cohen:
: <youtube height="200" width="300">dkrHJlHT3cM</youtube>
* First ever North America presentation on kveik and farmhouse ales by Lars Marius Garshol at Burnt City Brewing in Chicago, 2019:
: <youtube height=>D2NXyUOhQhA</youtube>* Norwegian farmhouse brewer Ivar Geithung documents the brewing and fermentation of a traditional farmhouse brew that takes inspiration from other areas (Chop and Brew video; part 1 and 2):: <youtube>oY2NpSTh0ic</youtube> <youtube>fjlkCMY2Bn8</youtube>* Author Susan Verberg demonstrating farmhouse brewing with hot rocks:: <youtube>sRZnc-h0p5o</youtube>* The Ale Apothecary owner Paul Arney's documentary on Norwegian farmhouse brewing:: <youtube>7PRz0Sy3XmM</youtube>* Traditional Nordic Beer Drinking Vessels by author Mika Laitinen:: <youtube>l-8C_J4zU8s</youtube>* Jeff Alworth films Kjetil Dale, farmhouse brewer in Voss, Norway (click [https://www.beervanablog.com/beervana/2022/5/18/farmhouse-brewing-in-vos here] for main article). Dale also offers farmhouse [https://eldhuset-dale.no/en brewing demonstrations to the public] at his farmhouse in Voss:: <youtube>785Ys6_rb80</youtube>* Lars Marius Garshol on Doug Piper podcast: "200" width="300The Art & Science of Brewing: Norwegian Kveik and Farmhouse Traditions": <youtube>bREPI2p-d8g</youtube>* Norwegian farmhouse brewers Ivar Geithung and Johnny Pedersen visit Northern Brewer and Chop n Brew to brew four different traditional farmhouse brews:: <youtube>AgCkR6hG2uI</youtube> <youtube>Jf2sxucyXsM</youtube>* Lars Marius Garshol farmhouse ale presentation at EBCU:: <youtube>011OksAkGsM</youtube>* Lars Marius Garshol interview on Beer Ladies Podcast:: <youtube>D2NXyUOhQhAbloKZdukwbs</youtube>
==See Also==
===Additional Articles on MTF Wiki===
* [[Landrace Yeast]]
* [[Raw Ale]]
* [[Saccharomyces]]
* [[MTF Thread Highlights]] (search for 'kveik')
* [[Mead]]
* [[Regional Styles]]
===External Resources===
* [http://www.garshol.priv.no/download/historical-tech/ "Historical Brewing Techniques" by Lars Marius Garshol.]
* [https://en.wikipedia.org/wiki/Kveik "Kveik" page on Wikipedia.]
* [https://www.escarpmentlabs.com/single-post/2019/07/16/Using-Norwegian-Kveik-Old-Yeast-New-Tricks Escarpment Labs blog post giving an overview of kveik and farmhouse beer styles.]
* [https://www.facebook.com/groups/174036689779170/about/ Kveik Buy/Sell Group on Facebook.]
* [http://masterbrewerspodcast.com/102-kveik MBAA podcast interview with Richard Preiss of Escarpment Labs on Kveik.]
* [https://www.mbaa.com/publications/tq/tqPastIssues/2018/Pages/TQ-55-4-1211-01.aspx "How to Brew with Kveik" by Lars Marius Garshol and Richrad Richard Preiss; MBAA TQ Quarterly (MBAA member access only).]* [https://www.kveiktraining.com "Kveik Training" by Sigurd Johan Saure in Sykkylven Norway; in person training on how to brew traditional Norwegian farmhouse ale at a traditional farmhouse brewery.] See also [https://www.youtube.com/watch?v=aKFFa1NcT0w this interview] with Sigurd.* [https://eldhuset-dale.no/en/ "The Kveik Experience"; in person smokehouse and farmhouse brewing sessions by Kjetil Dale in Voss, Norway.]* [https://www.goodbeerhunting.com/blog/2019/7/22/a-fire-being-kindled-the-revolutionary-story-of-kveik-norways-extraordinary-farmhouse-yeast "A Fire Being Kindled — The Revolutionary Story of Kveik, Norway’s Extraordinary Farmhouse Yeast," by Claire Bullen; an in depth introductory article on kveik.]* [https://www.goodbeerhunting.com/gbh-podcast/2020/7/21/ol-010-claire-bullen-reads-a-fire-being-kindledthe-revolutionary-story-of-kveik-norways-extraordinary-farmhouse-yeast GBH Podcast: OL-011 Claire Bullen Reads "A Fire Being Kindled—The Revolutionary Story of Kveik, Norway’s Extraordinary Farmhouse Yeast".]* [https://www.goodbeerhunting.com/gbh-podcast/2020/10/20/ol-013-claire-bullen-reads-the-land-of-fire-and-kveik-farmhouse-brewing-at-the-crossroads-in-voss-norway GBH Podcast: OL-013 Claire Bullen Reads, "The Land of Fire and Kveik — Farmhouse Brewing at the Crossroads in Voss, Norway".]
==References==

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