Abstract
The efficacy of the novel anthelmintic, monepantel (an amino-acetonitrile derivative), was investigated in sheep naturally infected with gastrointestinal nematodes in five studies in Argentina, Brazil, and Uruguay. Monepantel, administered at 2.5 mg/kg liveweight, was highly effective (>99.7%) against Haemonchus contortus, Teladorsagia (Ostertagia) circumcincta, Trichostrongylus axei, Trichostrongylus colubriformis, Cooperia curticei, Cooperia mcmasteri, Cooperia oncophora, Cooperia pectinata, Cooperia punctata, and Nematodirus spathiger, including strains resistant to the older broad-spectrum anthelmintics. Efficacy against C. mcmasteri, C. pectinata, and C. punctata is documented for the first time. The treatment with monepantel was well tolerated by the sheep.
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