Livestock have to live through horrible agony, like the worst kind of torture. This means (by biomass, which some people correlate indirectly with moral worth), at least 60% of mammals on Earth undergo horrible torture. Bentham's Bulldog, "Factory Farming is Literally Torture."

Excess pigs were roasted to death. Specifically, these pigs were killed by having hot steam enter the barn, at around 150 degrees, leading to them choking, suffocating, and roasting to death. It’s hard to see how an industry that chokes and burns beings to death can be said to be anything other than nightmarish, especially given that pigs are smarter than dogs.

Ozy Brennan: the subjective experience of animal's suffering 10/10 intense agony is likely the same as the subjective experience of a human suffering such agony. (~6 paragraph article, well worth a read.)