title: Field evidence of embryonic loss.
mesh_terms: D000818:Animals; D002417:Cattle; D004622:Embryo, Mammalian / Q000502:physiology*; D005260:Female; D005306:Fertilization; D011247:Pregnancy; D012756:Sheep; D013045:Species Specificity; D013223:Statistics as Topic; D013552:Swine