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An outbreak of haemonchosis associated with anthelmintic resistance in sheep
C L Yadav1, R P Uppal, S Kalra
1Department of Veterinary Parasitology, CCS Haryana Agricultural University, Hisar, India.
International Journal for Parasitology
|May 1, 1993
Abstract:
An outbreak of haemonchosis associated with anthelmintic resistance was recorded in a flock of 150 crossbred lambs. Closantel and ivermectin were 100% effective against Haemonchus contortus while fenbendazole and morantel reduced faecal egg counts by 87 and 29%, respectively. Levamisole showed an efficacy of 95%. At double the recommended dose (10 mg kg-1), fenbendazole had an efficacy of 99% against H. contortus infection. This appears to be the first report of an outbreak of haemonchosis associated with fenbendazole and morantel resistance in a strain of H. contortus in sheep.