title: SEASONAL VARIATION IN THE EFFECT OF PROGESTERONE ON OESTROUS CYCLES IN BEEF HEIFERS.
mesh_terms: D000818:Animals; D002417:Cattle; D002980:Climate; D004971:Estrus; D005260:Female; D010600:Pharmacology; D010828:Physiology, Comparative; D011374:Progesterone; D012106:Research; D012621:Seasons
chemical_list: D011374:Progesterone
keywords: CATTLE; ESTRUS; EXPERIMENTAL LAB STUDY; PHARMACOLOGY; PHYSIOLOGY, COMPARATIVE; PROGESTERONE; SEASONS