Unstable penicillin in animal food.
D000821:Animal Feed; D000818:Animals; D002645:Chickens / Q000254:growth & development; D010400:Penicillin G / Q000008:administration & dosage*; D010402:Penicillin G Procaine / Q000008:administration & dosage*
D010402:Penicillin G Procaine; D010400:Penicillin G