Field trials with closantel and Haemonchus contortus in sheep in Papua New Guinea |
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Authors: | I L Owen |
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Institution: | National Veterinary Laboratory, Department of Agriculture & Livestock, Boroko, Papua New Guinea. |
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Abstract: | Sheep treated once with closantel at 7.5 or 15.0 mg/kg and grazing with untreated sheep remained free of Haemonchus contortus for at least 4 to 5 weeks and 6 to 7 weeks respectively after treatment. When the whole flock was treated with 15.0 mg/kg, H. contortus began to become re-established 7 to 8 weeks later. Maximum benefit of the residual anthelmintic effect of closantel against H.contortus was obtained only when all sheep in the flock were treated; it took 10 weeks longer for H.contortus to form 50% of larval cultures when the whole flock was treated than when only a part of the flock was treated. |
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