Realistically, misuse and overuse of antibiotics in food-producing animals is just as much of a contributor to antibiotic resistance as misues and overuse of antibiotics in humans.

While therapeutic use makes sense and prophylactic use is often times defensible, the main issue is production use—feeding health food-producing animals antibiotics for the main purpose of increasing the weight gain.

National Antimicrobial Resistance Monitoring System for Enteric Bacteria • Antibiotic Use in Food-Producing Animals • CDC