title: Effect of exogenous progesterone on estrous cycle length.
mesh_terms: D000818:Animals; D002417:Cattle / Q000502:physiology*; D003338:Corpus Luteum / Q000187:drug effects; D004971:Estrus / Q000187:drug effects*; D005260:Female; D006168:Guinea Pigs; D011247:Pregnancy; D011374:Progesterone / Q000494:pharmacology*; D012756:Sheep / Q000502:physiology*; D013045:Species Specificity; D013552:Swine / Q000502:physiology*
chemical_list: D011374:Progesterone