About A1 & A2 milk
A major protein component of cow’s milk is β-casein. A1 and A2 are specific proteins found in cow's milk, though in different proportions depending on the breed of cattle. A1 milk, which is the most commonly used milk and is abundantly available, is obtained from cows of Western origin like Holstein, Jersey etc. and yields a large quantity of milk. The A2 milk is the milk obtained by the cows of Indian origin like Gir, Sahiwal etc. Regular milk contains both A1 and A2 beta-casein, but A2 milk contains only A2 beta-casein.
A detailed differentiation of both milk types is presented below