title: Pregnancy rates in cows and heifers inseminated at predetermined times using progesterone-releasing intravaginal devices.
mesh_terms: D000818:Animals; D002417:Cattle; D005260:Female; D007314:Insemination; D011247:Pregnancy; D011270:Pregnancy, Animal; D011374:Progesterone; D013997:Time Factors; D014621:Vagina
chemical_list: D011374:Progesterone