A2A2 Milk

Pleasant Meadow Creamery’s 100% Guernsey herd has been tested for beta casein and the entire herd produces A2A2 milk.  We are the only committed Idaho A2A2 dairy in the Coeur D’Alene, Sandpoint, and Bonners Ferry area.

What is A2A2 milk?

There are two types of the important cow’s milk protein beta-casein that can be found in milk.  They are A1 and A2 beta-casein.

A2A2 is what all cows originally produced.

At some point in history, a genetic mutation occurred and A1 beta-casein appeared and began to be more prevalent.   A1 milk is implicated in heart disease, Type 1 diabetes, autism, and schizophrenia and can cause minor symptoms as general ill feelings (congestion, nausea, etc.).  Dr. Joseph Mercola has an excellent article on the subject:


Holstein cows, the most prevalent dairy cow today, produce almost 100% A1 milk.

Jerseys are about 50/50 (though this greatly depends on the individual cow).

Brown Swiss generally have 75-85% A2 and the remainder A1.