Question: are all guernsey cows a2?
Answer: A2 milk is cow's milk that contains only the A2 variant of beta-casein protein. ... The most common variants among Western cattle are A1, A2, and B. In general, milks from Guernsey, Jersey, Asian herds, human milk, and others (sheep, goat, donkeys, yaks, camel, buffalo, sheep, etc.) contain mostly A2 beta casein.