How Much Are Antibiotics Used on Farms?

Eighty percent of the antibiotics sold in the U.S. are used in animal agriculture. The vast majority are for non-therapeutic purposes, such as promoting growth and compensating for the effects of unsanitary and overcrowded conditions. The amount of antibiotics used in animal agriculture is estimated to be more than four times the amount of drugs used to treat human illness.

https://www.foodsafetynews.com/2019/12/center-for-food-safety-petitions-for-more-accurate-drug-residue-testing/