Changes in the worm burden of lambs under continuous infection with Ostertagia circumcincta.
D000018:Abomasum / Q000469:parasitology; D000818:Animals; D010029:Ostertagiasis / Q000469:parasitology / Q000662:veterinary*; D012756:Sheep; D012757:Sheep Diseases / Q000469:parasitology*; D014252:Trichostrongyloidiasis / Q000662:veterinary*