title: Proceedings: Role of progesterone in regulating the length of the oestroud cycle in sheep.
mesh_terms: D000818:Animals; D004971:Estrus; D005260:Female; D011247:Pregnancy; D011374:Progesterone / Q000502:physiology*; D012756:Sheep / Q000502:physiology*
chemical_list: D011374:Progesterone