title: The validity of the "ultra-sonic method" for pregnancy diagnosis in ewes and goats.
mesh_terms: D000818:Animals; D005260:Female; D006041:Goats; D011247:Pregnancy; D011258:Pregnancy Tests / Q000662:veterinary*; D011270:Pregnancy, Animal; D011272:Pregnancy, Multiple; D012756:Sheep; D014463:Ultrasonography