Cadaver Exquisito, known as Tender is the Flesh in English. I read it in the original Spanish.

It's about a future where a virus infects all animals and so they have to be culled. But people still want to eat meat, so they begin farming humans.

It's basically just standard factory farming stuff, but when it's from the point of view of humans you see how horrific some of it is. It makes you think a lot about how animals are treated in agriculture.