A tremendous variety of additives appear in commercial livestock feed. Feed makers add a variety of antibiotics, such as bacitracin, chlortetracycline, erythromycin, lincomycin, neomycin sulfate, oleandomycin, oxytetracycline, procaine penicillin, streptomycin, tylosin, virginiamycin, and the bambermycins to animal feed to increase growth. These antibiotics usually do not prevent any particular animal disease, but they do increase […]