A small scale survey of ivermectin resistance in sheep nematodes using the faecal egg count reduction test on samples collected from Scottish sheep |
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Authors: | Bartley D J Donnan A A Jackson E Sargison N Mitchell G B B Jackson F |
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Affiliation: | Department of Parasitology, Moredun Research Institute, Pentland Science Park, Bush Loan, Penicuik EH26 0PZ, UK. dave.bartley@moredun.ac.uk |
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Abstract: | Thirty-eight sheep flocks, predominantly from the south/central Scotland, were examined using a faecal egg count reduction test (FECRT) for the presence of ivermectin (IVM) resistant nematodes. Efficacies of less than 95%, 14-17 days post-treatment, were identified in 6 of 17 naturally grazing flocks where pre-treatment faecal egg counts were in excess of 150 eggs per gram. Efficacies on these IVM resistant farms ranged from 66 to 92%. One other suspected cases of IVM resistance was also identified in returned material. The larvae detected in post-treatment coprocultures from resistant flocks were from the genera Teladorsagia (4 from 6) and Trichostrongylus (2 from 6). |
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