title: Effect of rams on the duration of oestrous behaviour in ewes.
mesh_terms: D000818:Animals; D002369:Castration; D004958:Estradiol / Q000008:administration & dosage / Q000494:pharmacology; D004971:Estrus; D005260:Female; D008297:Male; D011247:Pregnancy; D011374:Progesterone; D012726:Sexual Behavior, Animal / Q000187:drug effects; D012756:Sheep / Q000502:physiology*; D013997:Time Factors
chemical_list: D011374:Progesterone; D004958:Estradiol