The EEC and growth promotants.
D000822:Animal Husbandry; D000818:Animals; D002417:Cattle; D004338:Drug Combinations / Q000008:administration & dosage; D004958:Estradiol / Q000008:administration & dosage* / Q000031:analogs & derivatives*; D005062:European Union; D008460:Meat; D011374:Progesterone / Q000008:administration & dosage*; D012926:Social Control, Formal; D013739:Testosterone / Q000008:administration & dosage*
D004338:Drug Combinations; C046521:estradiol benzoate, testosterone propionate drug combination; D013739:Testosterone; D011374:Progesterone; D004958:Estradiol; C025370:estradiol benzoate, progesterone drug combination