Proceedings: progesterone requirements for the maintenance of pregnancy in the ovariectomized ewe.
D000818:Animals; D002369:Castration; D004958:Estradiol / Q000494:pharmacology; D004971:Estrus / Q000187:drug effects; D005260:Female; D007273:Injections, Intramuscular / Q000662:veterinary; D010053:Ovary; D010063:Ovum / Q000637:transplantation; D011247:Pregnancy; D011270:Pregnancy, Animal; D011374:Progesterone / Q000008:administration & dosage / Q000494:pharmacology*; D012756:Sheep / Q000502:physiology*
D011374:Progesterone; D004958:Estradiol