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Further field comment on anthelmintic resistance in sheep nematodes

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As a rural practitioner I would like to record my concern regarding the problem of benzimidazole (BZ) drench resistance in sheep. During this last autumn I have been involved in a number of investigations of suspected drench resistance which were confirmed by a faecal egg count depression (F.E.C.D.) test. The number of properties in my practice diagnosed as having BZ drench resistance by this method doubled as a result of this season`s investigations. There is now 6% of the Taihape practice sheep and beef farmers with recognised resistance. The total sheep population involved would be at least this 6% figure as some substantial properties are included. Moreover, the-faecal egg count reductions following BZ use on problem properties were commonly in the order of 20-50%. The properties were investigated only after requests from the owners who were experiencing clinical…

Keywords: Anthelmintic resistance; Gastrointestinal; Nematodes; Parasitology - internal; Sheep

Document Type: Regular Paper

Publication date: September 1, 1988

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