title: A very early pregnancy test for mammals: its application to the cow, ewe and sow.
mesh_terms: D000818:Animals; D002417:Cattle / Q000502:physiology*; D003338:Corpus Luteum; D003345:Corticosterone; D005260:Female; D008722:Methods; D011247:Pregnancy; D011258:Pregnancy Tests / Q000662:veterinary*; D011374:Progesterone / Q000097:blood; D011485:Protein Binding; D012756:Sheep / Q000502:physiology*; D013552:Swine / Q000502:physiology*; D014316:Tritium
chemical_list: D014316:Tritium; D011374:Progesterone; D003345:Corticosterone