[davidpaulyoung]

Jersey, Guernsey cows produce milk that only has the A2 protein naturally. No screening required. http://www.honeymoonbrands.com/milk and https://www.motherjones.com/environment/2014/03/a1-milk-a2-m...

[yorwba]

Your first link doesn't mention A1/A2 at all, and the second says "The A1 protein is much less prevalent in milk from Jersey, Guernsey, and most Asian and African cow breeds, where, instead, the A2 protein predominates." which doesn't support your claim that they only produce A2.