title: Population dynamics of Trichostrongylus colubriformis in sheep following anthelmintic treatment.
abstract: Three groups of five, three-and-a-half to four-month-old lambs were put to graze on three plots contaminated by Trichostrongylus colubriformis. One group (control) was free of parasites, while the other two were infected just before turning out with 3 X 700 third stage larvae. Depending on whether or not the lambs were treated with 50 mg kg-1 thiabendazole nine days after the first infection, the worm burden and the egg output increased or decreased during the grazing period when compared with the control group. In tracer animals put to graze on the same plots afterwards, it was found that the smaller the number of eggs excreted by the first lambs, the higher were the worm burdens of the tracer lambs.
mesh_terms: D000818:Animals; D005243:Feces / Q000469:parasitology; D010270:Parasite Egg Count / Q000662:veterinary; D012756:Sheep; D012757:Sheep Diseases / Q000188:drug therapy / Q000469:parasitology*; D013827:Thiabendazole / Q000627:therapeutic use*; D014252:Trichostrongyloidiasis / Q000662:veterinary*; D014253:Trichostrongylosis / Q000188:drug therapy / Q000662:veterinary*
chemical_list: D013827:Thiabendazole