Explore more about milk protein types.

Casein is the largest group of proteins in milk, making up about 80% of total protein content..

A1 and A2 milk differ in their protein content, specifically the type of casein. There are several types of casein in milk. Beta-casein is the second most prevalent and exists in at least 13 different forms.

The two most common forms are: 1. A1 beta-casein: Milk from breeds of cows that originated in northern Europe is generally high in A1 beta-casein. These breeds include Holstein, Friesian, Ayrshire, and British Shorthorn.

A2 beta-casein: Milk that is high in A2 beta-casein is mainly found in breeds that originated in the Channel Islands and southern France. These include Guernsey, Jersey, Charolais, and Limousin cows

Among these two  A2 milk contains only A2 beta-casein, which does not produce BCM-7 and easy to digest . So A2 milk is preferred for its perceived digestive benefits

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