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HomePhilippine Journal of Veterinary and Animal Sciencesvol. 26 no. 2 (2000)

Benzimidazole Resistance of Some Nematodes in Small Ruminants

Patricio B. Ancheta | Rosita A. Dumilon

Discipline: Veterinary Medicine, Animal Science



The study estimated the extent of benzimidazole resistance of nematodes in small ruminants using larval development assay (LOA). F.ecal samples were collected from 120 sheep and goats infected with nematodes. Worm eggs contained in the sample were cultured for one week in the laboratory in the presence of benzimidazole. From 24 pooled samples obtained from sheep and goats, LOA yielded Haemonchus contortus (77%), Trichostrongylus (16%) and Ostertagia (7%). The efficacy of benzimidazole for native goats, Anglo-Nubian, Saanen, Boer, upgraded goats and native sheep was estimated at 35%, 30%, 52%, 65%, 40% and 40%, respectively. The results suggest that there is considerable resistance of nematodes of goats and sheep to benzimidazole.