That’s right. They put in the pig’s milk in Mexico and then export it to the US. “
Is this potentially considered loshon hara/ motzi shem ra?
100% USDA Grade A milk is not permitted to contain anything other than cow’s milk. In any case, if one is makpid to only drink cholov Yisroel, he/she should not be eating products that are milchig but come from cholov stam. If you like ben and Jerry’s (who doesn’t?) and are eating it, then you are not makpid in Cholov Yisroel Not judging you, and also I don’t believe you are getting stomach aches from cholov stam. If it happens when you drink or eat CH”S products here in the USA, maybe something the cows are eating here is a slightly different version of the grains fed where you live, and it affects the structure of the milk, resulting in the reaction you describe.
When my daughter nurses the baby, if she has first eaten broccoli or cauliflower or the like, the baby is fussier than if she ate other things that are not gassy foods. Why should it be any different with cow’s milk?