A field trial with a new anthelmintic oxfendazole in naturally infected calves.

In a field trial on a series of 10 farms involving 116 calves the activity of oxfendazole at a dose rate of 2.5 mg/kg against gastro-intestinal helminths was assessed. On the basis of egg counts and larval differentiation before and after treatment it was shown that the compound had excellent activity against the most common nematodes. Although not proven in this trial, there were indications of some activity against inhibited stages of Ostertagia. Activity against Strongyloides was lower, while for Trichuris and Moniezia the infection rates before treatment were too low to draw any definitie conclusions about the activity of oxfendazole against these parasites.