2009•Haryana VeterinarianRequires access
STUDIES ON DEVELOPMENT OF REVERSION TO SUSCEPTIBILITY OF FENBENDAZOLE AND LEVAMISOLE RESISTANT HAEMONCHUS CONTORTUS STRAIN IN SHEEP
Satyavir Singh, Gupta Sk
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Abstract
SUMMARY by World Association for Advancement of Veterinary Parasitology. Portions of the individual faecal samples were also pooled within treatment and control groups before and after treatment for copro-cultures. The reduction in faecal egg counts of sheep treated with fenbendazole and levamisole was 78.9 and 79.7%, respectively and only Haemonchus contortus larvae were found on copro-culture. Anthelmintic resistance against fenbendazole and levarnisole was still present at the farm despite the history of withdrawal of these anthelmintics from the farm since 1995. In 1994-95, faecal egg count reduction for fenbendazole and levamisole was 42 and 24% which has now increased to 78.9 and 79.7%, respectively indicating partial reversion to susceptibility of fenbendazole and levamisole resistant strains of Haemonchus contortus.