Synchronization of oestrus in heifers with norethisterone.
D000818:Animals; D002417:Cattle / Q000502:physiology*; D003276:Contraceptives, Oral / Q000494:pharmacology; D004971:Estrus / Q000187:drug effects*; D005260:Female; D005306:Fertilization / Q000187:drug effects; D009640:Norethindrone / Q000008:administration & dosage / Q000494:pharmacology*; D011247:Pregnancy; D012726:Sexual Behavior, Animal / Q000187:drug effects
D003276:Contraceptives, Oral; D009640:Norethindrone