title: Effect of exogenous progesterone on time of occurrence of the LH surge in heifers.
mesh_terms: D000818:Animals; D002417:Cattle / Q000502:physiology*; D004973:Estrus Synchronization / Q000187:drug effects*; D005260:Female; D007986:Luteinizing Hormone / Q000502:physiology*; D011247:Pregnancy; D011374:Progesterone / Q000008:administration & dosage / Q000494:pharmacology*; D013997:Time Factors
chemical_list: D011374:Progesterone; D007986:Luteinizing Hormone