The occurrence of Ostertagia crimensis and O. pinnata in New Zealand sheep.
D000818:Animals; D009520:New Zealand; D012756:Sheep; D012757:Sheep Diseases / Q000453:epidemiology / Q000382:microbiology*; D013045:Species Specificity; D014251:Trichostrongyloidea / Q000302:isolation & purification*; D014252:Trichostrongyloidiasis / Q000453:epidemiology