title: Relation of number of embryos in domestic sows to sex steroid hormone changes during the first 28 days of pregnancy.
mesh_terms: D000818:Animals; D001344:Autopsy; D001947:Breeding; D004622:Embryo, Mammalian / Q000378:metabolism; D004971:Estrus; D005260:Female; D005313:Fetal Death / Q000662:veterinary; D005865:Gestational Age; D007986:Luteinizing Hormone / Q000097:blood*; D011247:Pregnancy; D011270:Pregnancy, Animal; D011276:Pregnanediol / Q000652:urine; D011278:Pregnanes / Q000652:urine; D011374:Progesterone / Q000097:blood* / Q000378:metabolism / Q000652:urine; D013552:Swine / Q000502:physiology*
chemical_list: D011278:Pregnanes; D011374:Progesterone; D007986:Luteinizing Hormone; D011276:Pregnanediol