title: Density-dependent survival in populations of Ostertagia ostertagi.
mesh_terms: D000818:Animals; D002417:Cattle; D007814:Larva / Q000254:growth & development; D008954:Models, Biological; D010029:Ostertagiasis / Q000469:parasitology*; D011157:Population Dynamics; D014251:Trichostrongyloidea / Q000254:growth & development*; D014252:Trichostrongyloidiasis / Q000469:parasitology*