I never saw exclusivly any animal killing or slaughtering in factory farms , but I was aware something is just not right about it. Everything is kept so much hidden from people that they dont actually see or realise it. And then I watched one video where a piglet was left consciously bleeding to death, was painfully crying a LOT just that sound touched my heart and I wished I could go and stop it, I felt really horrible.
And too many diseases. Mad cow disease is just another horror in meat industry, when I read about it I was very disgusted to hear that they even feed garbage of blood,carcass waste from slaughter industry, to herbivorous cattles eventually bringing diseases like MAD COW disease, you can check that out. . The government has tightened cattle-feed rules, but loopholes still permit cattle blood as a milk substitute and chicken waste as a protein supplement. If you live in U.S. or Canada you probably know that it remains common to include the blood, bone, and unwanted flesh of all types of farmed animals in the feed of chickens, turkeys, and pigs,etc which is illegal in Europe and Japan