The efficacy of fenbendazole at a dosage rate of 5 mg/kg against nematode infestations in cattle.

The anthelmintic efficacy of fenbendazole, dosed to artificially infested cattle at 5 mg/kg live mass was determined against immature and adult Haemonchus placei. Ostertagia ostertagi, Cooperia spp., Bunostomum phlebotomum and Oesophagostomum radiatum. At this dosage rate, fenbendazole was more than 80% effective in more than 80% of the animals treated against the abovementioned nematodes. The only exception was against the third-stage larvae of B. phlebotomum when it fell to more than 60% effective in more than 60% of the animals treated.