A2 milk dairy herd in the United States. A1 and A2 are genetic variants of the beta-casein milk protein. Most cow milk is A1. Non-cow milk, including that of buffalo, camels, donkeys, goats, sheep, yaks and even human mothers are mostly A2, which limits exposure to "cow milk protein allergies, including lactose intolerance". It took over 12 years to build the A2 herd. With the established A2 herd, Braum’s is now producing only A2 milk for sale in its own Braum’s stores. References External links Encyclopedia of Oklahoma History and Culture – Braum's Dairy Nostalgia website C'mon Fwank pays tribute to Braum's Companies based in Oklahoma City Privately held companies based in Oklahoma Restaurants in Oklahoma Economy of the Western United States Regional restaurant chains in the United States Fast-food chains of the United States Restaurants established in 1968 Ice cream parlors in the United States 1968 establishments in Oklahoma Ice cream brands Dairy products companies of the United States Oklahoma culture