Journal
VETERINARY RECORD
Volume 156, Issue 4, Pages 105-109Publisher
BRITISH VETERINARY ASSOC
DOI: 10.1136/vr.156.4.105
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Control of a benzimidazole-, levamisole- and ivermectin-resistant population of Teladorsagia circumcincta was attempted using moxidectin administered orally at the manufacturer's recommended dose rate of 200 mug/kg bodyweight. Ewes were dosed after lambing with the aim of controlling their periparturient rise in faecal egg output and lambs were dosed at six-week intervals throughout the summer. This regimen failed to suppress the establishment of significant numbers of infective helminth larvae on the pasture, resulting in unsatisfactory lamb production. oral dosing with moxidectin was effective in removing adult female burdens of ivermectin-resistant T circumcincto, but the effect of the drug did not persist against the resistant helminth population.
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