Quote (cialda @ Aug 4 2014 08:49pm)
Bourbon and oak barrels would provide their own strong flavors to the beer. if you are going for a sour, id imagine that they may be overpowering for the style of beer. wine barrels are oak as well, but should impart less flavor due to them previously been used.
I dont know about the microorganisms being inside prior to aging, but i believe a lot of breweries add in "wild" yeast for the sour process. The barrels themselves should assist in souring vs a carboy due to the dark, cool environment and also gain from the porousness of a barrel - lets oxygen, which is needed for souring.
i am more inclined to think that most microorganisms are pitched in due to the fact that a lot of breweries want to offer a consistent product. Also, they have access to "wild" yeast strains that can produce the desired outcome instead of doing it the alternative way.
as far as wine barrels, brewers yeast naturally occurs on grape skins, due to the poruous nature of the barrel this natural yeast is defiantly going to play a role in what ever you put in the barrel after the wine.
beyond that sour beers are a complex mix of microbes, barrels are often used for them because the pourous wood serves as a home for them even after a 180 water spray and scrub, in this way the barrel can be re-used and maintain the similar microbe mix.
also some of the lambic baterias don't really come to age for a while, brettameces lambicus takes 3 years before its well aged, in this way as you continue to reuse the barrel the bacteria's can properly mature.
I don't have a barrel so I use plastic buckets and put some pieces of oak in them.
This post was edited by Ylem122 on Aug 4 2014 10:26pm