Ostertagia spp. in lambs and pregnant ewes.
D000818:Animals; D005260:Female; D066298:In Vitro Techniques; D007411:Intestinal Diseases, Parasitic / Q000662:veterinary*; D011247:Pregnancy; D011248:Pregnancy Complications / Q000662:veterinary*; D012756:Sheep; D012757:Sheep Diseases; D013321:Strongyloides