EVERYDAY SCIENCE

Detailed explanation-1: -Casein and whey protein are the major proteins of milk.

Detailed explanation-2: -A1 and A2 are the two primary types of beta-casein (beta-casein is one of the three major casein proteins) present in milk. They are simply genetic variants of one another that differ in structure by one amino acid.

Detailed explanation-3: -The proteins of human milk are divided into the whey and casein fractions or complexes, with each comprised by a remarkable array of specific proteins and peptides. The most abundant proteins are casein, -lactalbumin, lactoferrin, secretory immunoglobulin IgA, lysozyme, and serum albumin.

Detailed explanation-4: -Milk is a good source of protein, with 8 grams in a cup-or about 1 gram of protein per ounce.

Detailed explanation-5: -A1 milk is obtained from cows of Western origin like Holstein Friesian, Jersey etc. and yields large quantities of milk. A2 milk, on the other hand, is obtained from cows of Indian origin like Gir, Sahiwal etc. which may give relatively lesser milk.