title: Synchronization of oestrus in heifers with implants of progesterone.
mesh_terms: D000818:Animals; D002417:Cattle / Q000502:physiology*; D003307:Copulation; D003692:Delayed-Action Preparations; D004958:Estradiol / Q000008:administration & dosage / Q000494:pharmacology; D004971:Estrus / Q000187:drug effects*; D005260:Female; D005298:Fertility / Q000187:drug effects; D005306:Fertilization / Q000187:drug effects; D008297:Male; D011247:Pregnancy; D011374:Progesterone / Q000008:administration & dosage / Q000494:pharmacology*; D012826:Silicone Elastomers; D014659:Vasectomy
chemical_list: D003692:Delayed-Action Preparations; D012826:Silicone Elastomers; D011374:Progesterone; D004958:Estradiol