A2 milk comes from cows with A2A2 genes. They inherited from their sire and dam the ability to produce a protein called beta-casein A2, present, for example, in breast milk.

Cows with A1A1 or A1A2 genes produce beta-casein A1 protein, which, according to some studies, releases a substance that can cause discomforts, such as stomach gas and bloat. This type of milk is the most widely sold in the markets. Casein 2, on the other hand, is easier to digest.

42% of CAMPO LONGLEY heifers are certified by Laboratorio Genexa as A2A2.