title: Proceedings: Progesterone and oestrogen requirements for the survival of embryos in the ovariectomized ewe.
mesh_terms: D000818:Animals; D002369:Castration; D004624:Embryo Transfer; D004958:Estradiol / Q000494:pharmacology*; D005260:Female; D011247:Pregnancy / Q000187:drug effects*; D011255:Pregnancy Maintenance / Q000187:drug effects*; D011374:Progesterone / Q000494:pharmacology*; D012756:Sheep
chemical_list: D011374:Progesterone; D004958:Estradiol