The seasonal fluctuations of the larval populations of four species of trichostrongylid nematode on pasture herbage.
D000818:Animals; D007814:Larva; D010270:Parasite Egg Count; D006109:Poaceae; D012621:Seasons; D012756:Sheep; D012757:Sheep Diseases; D014251:Trichostrongyloidea / Q000302:isolation & purification*; D014252:Trichostrongyloidiasis / Q000662:veterinary