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What is A1 and A2 and What is the Difference?

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

There are several types of casein in milk, and beta-casein is the second most common. Beta-casein exists in at least 13 different forms.

The two most common forms of beta-casein are:

  • A1 beta-casein: Milk from breeds of cows that originated in northern Europe is generally high in A1 beta-casein. A1 milk comes from breeds like the 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, Southern France and a few other places. The common breeds in India with A2 milk are Gir, Sahiwal, Raathi, Sindhi and a few more.



Difference between A1 & A2 Milk




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