title: Attempts to determine the optimal time of artificial insemination in heifers.
mesh_terms: D000818:Animals; D002417:Cattle / Q000502:physiology*; D006063:Chorionic Gonadotropin / Q000494:pharmacology; D004958:Estradiol / Q000494:pharmacology; D005260:Female; D005298:Fertility; D007315:Insemination, Artificial; D008297:Male; D010060:Ovulation / Q000187:drug effects; D010906:Pituitary Hormone-Releasing Hormones / Q000494:pharmacology; D011374:Progesterone / Q000494:pharmacology; D013997:Time Factors
chemical_list: D006063:Chorionic Gonadotropin; D010906:Pituitary Hormone-Releasing Hormones; D011374:Progesterone; D004958:Estradiol