“Breeding psychopathic cows seemed like a good idea until they took control” seems like a very weird comic book plot line or something :-)

That's something that I was also thinking about. Maybe because we can't fine tune cows stupid enough to not to feel remorse for slaughtering but intelligent enough to breed, eat, take care of the calfs? Probably, at scale, it's not viable to take care of animals who can't function independently.

can't help to think about Brave New World where they basically do that for inferior-cast humans. A great read. I recommend the sequel Brave New World Revisited

Those looks like to be the full texts (didn't verify):

https://www.huxley.net/bnw/index.html

https://www.huxley.net/bnw-revisited/