title: Feedback basis of seasonal breeding: test of an hypothesis.
mesh_terms: D000780:Anestrus; D000818:Animals; D001947:Breeding; D002369:Castration; D003864:Depression, Chemical; D004958:Estradiol / Q000097:blood / Q000494:pharmacology*; D005246:Feedback; D005260:Female; D007986:Luteinizing Hormone / Q000378:metabolism*; D010060:Ovulation; D011247:Pregnancy; D011374:Progesterone / Q000097:blood; D012621:Seasons; D012756:Sheep / Q000502:physiology*
chemical_list: D011374:Progesterone; D004958:Estradiol; D007986:Luteinizing Hormone