title: Transuterine embryonal migration in sheep, anteroposterior orientation of pig and sheep fetuses and presentation of piglets at birth.
mesh_terms: D000818:Animals; D001722:Birth Order; D004622:Embryo, Mammalian / Q000502:physiology*; D005260:Female; D005333:Fetus / Q000502:physiology*; D005865:Gestational Age; D007746:Labor Presentation / Q000662:veterinary*; D010060:Ovulation; D011247:Pregnancy; D011272:Pregnancy, Multiple; D012756:Sheep / Q000502:physiology*; D013552:Swine / Q000502:physiology*; D014599:Uterus