title: The effect of age on the development by sheep of resistance to Trichostrongylus colubriformis.
mesh_terms: D000367:Age Factors; D000818:Animals; D007110:Immunity, Active; D007814:Larva; D010270:Parasite Egg Count; D012756:Sheep; D012757:Sheep Diseases / Q000276:immunology* / Q000473:pathology; D014252:Trichostrongyloidiasis / Q000276:immunology / Q000473:pathology / Q000662:veterinary*