Looks like good old fashioned genetic screening. > A genetic test, developed by the a2 Milk Company, determines whether a cow produces A2 or A1 type protein in

Looks like good old fashioned genetic screening. > A genetic test, developed by the a2 Milk Company, determines whether a cow produces A2 or A1 type protein in its milk. The test allows the company to certify milk producers as producing milk that does not metabolise to β-casomorphin 7. https://en.wikipedia.org/wiki/A2_milk https://en.wikipedia.org/wiki/A2_milk