title: Relationship of fetal gonads to urinary estrogen excretion by the pregnant mare.
mesh_terms: D000034:Abortion, Veterinary / Q000209:etiology; D000818:Animals; D002369:Castration; D004967:Estrogens / Q000652:urine*; D005260:Female; D005333:Fetus / Q000502:physiology*; D006066:Gonads / Q000196:embryology / Q000502:physiology*; D006734:Horse Diseases / Q000209:etiology; D006736:Horses / Q000502:physiology*; D008297:Male; D008722:Methods; D011247:Pregnancy; D011270:Pregnancy, Animal
chemical_list: D004967:Estrogens