title: Corpus luteum removal and steroid treatment of heifers in four consecutive estrous cycles: effects on frequency of cystic ovaries and expression of estrus.
mesh_terms: D000818:Animals; D002369:Castration; D002417:Cattle; D002418:Cattle Diseases / Q000209:etiology*; D003338:Corpus Luteum / Q000033:anatomy & histology / Q000502:physiology* / Q000601:surgery; D004958:Estradiol / Q000008:administration & dosage / Q000494:pharmacology*; D004971:Estrus / Q000187:drug effects; D005260:Female; D012739:Gonadal Steroid Hormones / Q000494:pharmacology*; D007273:Injections, Intramuscular; D009929:Organ Size; D010048:Ovarian Cysts / Q000209:etiology / Q000473:pathology / Q000662:veterinary*; D011247:Pregnancy; D011374:Progesterone / Q000008:administration & dosage / Q000494:pharmacology*
chemical_list: D012739:Gonadal Steroid Hormones; D011374:Progesterone; D004958:Estradiol