[Electrocardiographic control of the period of pregnancy in cows].
D000818:Animals; D002417:Cattle / Q000502:physiology*; D004562:Electrocardiography / Q000662:veterinary*; D005260:Female; D005318:Fetal Heart / Q000502:physiology; D011247:Pregnancy; D011270:Pregnancy, Animal
Elektrokardiograficheskiĭ kontrol' srokov stel'nosti u korov.