title: Populations of strongyloid nematode infective stages in sheep pastures: comparison between direct pasture sampling and tracer lambs as estimators of larval abundance.
mesh_terms: D000818:Animals; D006189:Haemonchus / Q000254:growth & development; D010274:Parasitology / Q000379:methods; D012756:Sheep / Q000469:parasitology*; D012987:Soil; D014251:Trichostrongyloidea / Q000254:growth & development*
chemical_list: D012987:Soil