The efficacy of levamisole and ivermectin against a morantel-resistant strain of Trichostrongylus colubriformis |
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| Authors: | PB McKenna |
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| Institution: | Palmerston North Animal Health Laboratory , P.O. Box 1654, Palmerston North |
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| Abstract: | A controlled slaughter trial was undertaken to evaluate the efficacy of ivermectin (0.2 mg/kg) and levamisole (8 mg/kg) against a morantel-resistant field strain of Trichostrongylus colubriformis in sheep. Mean worm count reductions of greater than 99% were recorded with both anthelmintics. The apparent contradiction between the high efficacy of levamisole and the common belief that resistance to levamisole and morantel is co-inherited, is discussed. |
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