I agree this is a major and disgusting problem, however the article does mention this; albeit with a different assumed reason. >farmers have pumped cattle and

I agree this is a major and disgusting problem, however the article does mention this; albeit with a different assumed reason. >farmers have pumped cattle and chickens full of antibiotics because they plump up the animals (possibly because the antibiotics kill benign gut bacteria that usually take some of the creatures’ daily calories for themselves).