Some context for the scale of this:

“[F]armed poultry today makes up 70% of all birds on the planet, with just 30% being wild. The picture is even more stark for mammals – 60% of all mammals on Earth are livestock, mostly cattle and pigs, 36% are human and just 4% are wild animals.”

https://www.theguardian.com/environment/2018/may/21/human-ra...