A1 and A2 refer to two variants of the beta-casein protein in milk. Some people report easier digestion of A2-only milk. Most modern dairy cows (Holstein, Friesian) produce a mix; some heritage breeds (Jersey can be either, Guernsey often A2, Brown Swiss often A2) produce predominantly A2. Breed and individual cow vary.
Livestock-breeds pages cover dairy breeds.
Related on Bield: Farm
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What is the difference between A1 and A2 milk and which breeds produce A2?
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