title: Internal parasitism of beef cattle on winter pastures: effects of initial level of parasitism on beef production.
mesh_terms: D000818:Animals; D001835:Body Weight; D002417:Cattle / Q000254:growth & development*; D002418:Cattle Diseases / Q000503:physiopathology*; D007814:Larva / Q000302:isolation & purification; D012621:Seasons; D014251:Trichostrongyloidea / Q000302:isolation & purification; D014252:Trichostrongyloidiasis / Q000503:physiopathology / Q000662:veterinary*; D014886:Weaning