Honestly with the term animal abuse a guideline for it is needed. Because there is things some farmers do that outsiders call abuse when in reality it's not, in our case we disbud goats and typically bottle raised the kids. Why? Well disbudding keeps both us and them safe, I have personally lost a few to hanging themselves in the fence when we didn't get them disbudded right (hence why we have spent money to have the vet dehorn if needed). I have also seen a doe kill a kid and another literally chew a kid's tail off (that doe will be with us till she dies, the tailless one). Also have seen first hand kids utterly destroy their mother's udder by how brutal they nurse.
But by choosing to bottle raise the kids and disbud them I been called a abuser.
AIing animals is another hot topic, and honestly I'm all for it because I have been attacked by aggressive bucks. It not pretty, also have seen farmer's lives lost to bulls. AI also ensures animal STDs aren't passed (yes real thing) and can save breeds as you can get genetics to your animals that may be thousands of miles away.
I agree there are some shitty farmers out there, Poultry farms alot that is because of the industry and how it's build. Beef cattle is more of a grey zone within the US as 90% of the cattle are grown on family operations who typically do pasture raise with heavy supplements, the 10% is feed lots that often times the 90% has cows sent there because of the contracts. Dairy farms within the US that are USDA cert and everything typically have the least offensive methods and what developed is for the animal's safety.
Pig farms, having raised them myself certain things like farrow pens make sense. Animal mothers can be downright evil unfortunately. Then again I refuse to eat pigs even if I wasn't converting to a religion that bans them off the menu they down right scare me.
I agree that animal welfare is needed, but like I said often times what people define as abuse for a animal is far from the truth.
Though like I said, much of current agriculture is being developed because of the consumer. Many farmers (within the US) who do work in commercial end up having to become serfs to metacorperations because the Laws are not in the favor of small time producers, and if you don't follow what the corporation wants on method of raising you don't get paid.