The Origins of a2 milk

There are two main forms of the important cows' milk protein beta casein found in the cows' milk that you drink. These two forms are known as A1 and A2 beta casein.

The A2 form of beta casein has been identified by scientific research to be the original form of beta casein that would have been produced by cows thousands of years ago.

At some point in history, owing to natural genetic mutation, the A1 form appeared in dairy cattle and was spread throughout dairy herds across Europe, becoming the common form of beta casein in many breeds of cows.

Traditional cattle breeds such as the zebu, the native Asian cattle and closely related animals such as the water buffalo and yak all still only produce the A2 form of beta casein.

Some dairy cows still only produce the A2 type of beta casein and these can be identified and milked to produce a2 milk.

by Professor Keith Woodford.
2007. Craig Potton Publishing (Christchurch)
"Devil in the Milk"

See A2Science.com for more information