EDIT: here’s a source for that figure
Previous studies have estimated that 73% of all antimicrobials sold globally are used in animals raised for food
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7766021/pdf/antibiotics-09-00918.pdf
6 points
Sorry I’m too lazy to look up a source, but the way I’ve heard it explained is that while they might occasionally give them to sick animals as a sort of panacea, they often just give all of them a low dose. Apparently it like, makes their immune system not have to work as hard so they gain weight faster. Which is basically textbook how to make resistant bacteria.
