Pregnancy diagnosis and detection of foetal life in sheep and pigs by an ultrasonic method.
D000818:Animals; D005260:Female; D005333:Fetus / Q000502:physiology*; D011247:Pregnancy; D011270:Pregnancy, Animal / Q000502:physiology*; D012756:Sheep / Q000502:physiology*; D013552:Swine / Q000502:physiology*; D014465:Ultrasonics / Q000295:instrumentation*; D014730:Veterinary Medicine / Q000295:instrumentation*