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I wouldn't be surprised if the majority of meat makes it to pets and livestock too.
I base that only on the easy supply of cow/pig/sheep/chicken feet/tendons/penises/cheeks/ears/gullets/stomachs that I buy for my dog.
Right, but lots of animals are omnivores. Left to the their own devices chickens and pigs eat meet.
Interestingly you can use blood for biogas production.
It's mostly grown as livestock feed. Comparatively little of it is eaten by humans.