1) A company, A2 Corporation, was founded in New Zealand in the early 2000s to commercialize the test and market "A2 Milk" as a premium milk that is healthier due to the lack of peptides from A1. A2 Milk even petitioned the Food Standards Australia New Zealand regulatory authority to require a health warning on ordinary milk.
2) UNDOCUMENTED: Humans produce A2A2 milk only and those humans that are lactose intolerant are not lactose Beta casein A2 intolerant
3) A compelling reason to breed for and select for Beta casein A2:. "Approximately five thousand years ago, a mutation occurred in the amino acids of this protein, causing it to produce a peptide called BCM7. The mutation occurred predominantly in cows from Europe but not those from Asia and Africa. Almost all Holsteins, commonly associated with dairy cows (the famous black and-white cows seen in milk commercials), carry this peptide.
4) As quoted from http://www.a2a2milk.com/
Cows that carry the BCM7 peptide are known as A1 cows. Those that do not are referred to as A2 cows. In other words, the cows WITH the mutation are A1 cows. What’s important to know is that BCM7 has proinflammatory, opiate-like properties and has been shown to contribute largely to a wide variety of chronic diseases, including autoimmune conditions, heart disease, autism, schizophrenia and various neurological disorders. Injecting BCM7 into animals caused Type 1 diabetes to occur.
5a) Perhaps the best over view and description of the benefits of A2A2 Milk can be found on Semex's on line catalog.
5b) And/or that of the list of A2A2 sires of Alta Genetics as quoted, "If you focus in on the protein within milk, the major component of that milk protein is called casein. One type of casein within milk is beta casein. There are two different beta casein genes that cattle can have - A1 or A2. These two types of beta casein are found at two different locations, so any given bovine will be either A1A1, A1A2 or A2A2 for beta casein. Why does this matter? Studies have found that when a person drinks milk, digestive enzymes interact with A1 and A2 beta-casein proteins in different ways, so they are processed differently within the body. Some believe the A2 gene is more natural, and therefore more healthy. That has led to a recent consumer demand for A2A2 milk. True A2 milk can only be produced from cattle possessing the A2 gene at both locations. So the one and only determining factor determining whether milk is A1 or A2 lies in the genetic make-up of the animal producing the milk." Perhaps there should be a correction made here, for the location is the same, but on different chromosomes in the pair. One acquired from each parent.
Just for further clarification. There are 2 caseins Beta casein (primarily A1 and A2) and Kappa casein (primarily A, B and E), the cheese maker's. These 2 caseins are on 2 different locations on the same chromosome.
Interesting enough, there is a high correlation between the inferior Beta casein A1 and the inferior Kappa casein E.
A2A2 Milk Plus/Links
Raw milk/ Listeria test http://foodsafety.neogen.com/en/listeria-right-now