Determining fetal numbers in pregnant ewes.
D000650:Amnion / Q000033:anatomy & histology; D000818:Animals; D003338:Corpus Luteum / Q000033:anatomy & histology; D005260:Female; D005318:Fetal Heart / Q000502:physiology; D005333:Fetus / Q000033:anatomy & histology; D005865:Gestational Age; D006326:Heart Auscultation / Q000662:veterinary; D007813:Laparotomy / Q000662:veterinary; D010173:Palpation / Q000662:veterinary; D011247:Pregnancy; D011272:Pregnancy, Multiple; D012756:Sheep / Q000502:physiology*; D014463:Ultrasonography; D014599:Uterus / Q000033:anatomy & histology