Efficiency of feeding Duddingtonia flagrans chlamydospores to grazing ewes on reducing availability of parasitic nematode larvae on pasture

摘要: Abstract Gastrointestinal nematodes are of concern in sheep production because and economic losses. Control these is primarily based on the use anthelmintic treatment pasture management. The almost exclusive has resulted development resistance which led to need for other parasite control options be explored. blood sucking abomasal parasitic nematode Haemonchus contortus causes severe losses small ruminant warm, humid sub-tropic tropics. This study evaluated effectiveness a trapping fungus, Duddingtonia flagrans, reducing availability larvae, specifically H. contortus, pasture. Chlamydospores D. flagrans were mixed with supplement feed was fed daily group crossbred ewes duration summer grazing season. A same without chlamydospores. reduction infective larval numbers observed fecal cultures fungus-fed group. Herbage samples from grazed by also showed larvae. There no significant (P>0.05) differences overall egg count, packed cell volume or animal weight between groups. Tracer animals placed pastures at end assess infectivity. Although tracer only two per group, those that had substantially reduced (96.8%) burdens as compared Results demonstrated fungus did have activity against larvae feces infectivity subsequently animals. ewes, an effective biological agent predominantly population