title: The ecology of the free-living stages of Ostertagia circumcincta.
mesh_terms: D000818:Animals; D004463:Ecology; D007814:Larva / Q000254:growth & development; D010029:Ostertagiasis / Q000469:parasitology / Q000662:veterinary; D012756:Sheep; D012757:Sheep Diseases / Q000469:parasitology; D014251:Trichostrongyloidea / Q000254:growth & development*