Emergence of anthelmintic resistance in ruminants of Chhattisgarh

In the present study ivermectin resistance could not be observed in all three selected agroclimatic zones but resistance against albendazole in Chhattisgarh Plain and levamisole resistance in Northern Hills Region was detected in nematode parasites of goats. Emergence of resistance and suspected resistance against albendazole and levamisole, respectively could be recorded in cattle only in Bastar Plateau while, nematode parasites of cattle of rest of the agroclimatic zones appeared to be susceptible. Larval composition of resistant population revealed Haemonchus spp. as the predominant worms exhibing resistance. ED₅₀ for egg hatch was 0.150 in goats of Chhattisgarh Plain and considered resistant, while those of Northern Hills Region and Bastar Plateau were susceptible. Observation on egg hatch assay corroborated with the results of faecal egg count reduction test (FECRT).