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No Evidence for Resistance to Fenbendazole in Trichostrongylus tenuis,a Nematode Parasite of the Red Grouse |
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| Authors: | Ruth Cox David Newborn David Baines Christopher J Thomas Thomas N Sherratt |
| Institution: | 1. The Game and Wildlife Conservation Trust, The Gillett, Forest-in-Teesdale, County Durham DL12 0HA, United Kingdom;2. Department of Biological and Biomedical Sciences, University of Durham, South Road, Durham DH1 3LE, United Kingdom
Institute of Rural Sciences, University of Wales, Llanbadarn Fawr, Aberystwyth, Ceredigion SY23 3AL, Wales, United Kingdom;3. Department of Biology, Carleton University, 1125 Colonel By Drive, Ottawa, ON K1S 5B6, Canada |
| Abstract: | ABSTRACT The parasitic nematode Trichostrongylus tenuis has a detrimental effect on red grouse (Lagopus lagopus scoticus) at the individual and population levels. Treatment using grit coated with the anthelmintic fenbendazole hydrochloride reduces parasite infection and increases grouse density. However, a frequent and low dose of anthelmintic increases selection pressure for parasite resistance, a serious practical and economic problem. We used an egg hatch assay to test resistance of T. tenuis from 12 moors in northern England, which differed in grit treatment intensity. The anthelmintic concentration that prevented 50% and 95% of T. tenuis eggs from hatching (ED50 and ED95, respectively) did not differ among moors and were not related to treatment. We suggest annual monitoring and responsible anthelmintic use to prevent resistance so that medicated grit continues to enhance red grouse management. |
| Keywords: | anthelmintic resistance fenbendazole medicated grit nematode red grouse Trichostrongylus |