Yytz, you are not allowed to neuter an animal or even ask a goy to do it, but I’m pretty sure you are permitted to purchase a neutered animal. Also, if Rav Moshe Feinstein held it was assur to raise veal in such a manner and even to eat it when you weren’t the one who raised it, then why did he teach the less machmir case? That’s called a “diyo”. Let him say the more chamur case of eating, and I would have learned the obvious case of raising it. Must be that it’s muttar to eat. That’s a very basic step in limud haTorah.
Also, there is a chiluk between stolen and abused. Think about it this way, the agriculture market has a certain amount of heads of cattle and each head is sold to the highest bidder, not one by one, but in batch auctions nonetheless. It’s not like cows are released into the wild if they aren’t sold, they are slaughtered when they get to a certain weight and age and are either consumed here or slaughtered and exported. Us refraining from eating a cow is just condemning them to a mundane death and depriving their ruach of the zchus of being eaten in a kosher way. Unless you have a dramatic impact on demand you won’t cause ranchers to curb their supplies. They aim to breed as many heads as possible. More heads=more $$. All you are doing is letting them die for naught, when you could have gotten one more cow to Gan Eden, so to speak. A stolen animal on the other hand is a different issue altogether, you are buying a cow that doesn’t belong to the person you are buying it from. That’s not really related