So called “Chalav Stam” is indeed dangerous territory.
About 15% of all cows in the USA have had their stomachs stapled to help them avoid the painful stress that the gas produced by feeding them cheap animal feed causes. This stress can reduce milk output.
Problem is that almost all Poskim consider these cows to be Treif since they have a puncture in the stomach.
If they are Treif, that means that the huge dairy cooperatives that supply milk in the USA are producing a product that has Chalav Treifa (much worse than Chalav Akum – it is Min HaTorah) in large amounts that is not Battel.
Only the small supervised Chalav Yisrael dairy farms avoid this problem.
If the farmers would be willing to spend money for better feed, this surgery would not be needed.
So it’s only money. The farmer is cheap. And you are also cheap – trying to save money that Chalav Yisrael must charge.
In the process, you transgress an Issur D’Oraisa.
Pretty dangerous, no?