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  • Title: Failure of moxidectin to control benzimidazole-, levamisole- and ivermectin-resistant Teladorsagia circumcinda in a sheep flock.
    Author: Sargison ND, Jackson F, Bartley DJ, Moir AC.
    Journal: Vet Rec; 2005 Jan 22; 156(4):105-9. PubMed ID: 15704550.
    Abstract:
    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 microg/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. circumcincta, but the effect of the drug did not persist against the resistant helminth population.
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