[Effect of fenbendazole (Panacur) in sheep naturally invaded by gastrointestinal and lung nemtaodes].

The paper presents the results of the clinical tests of fenbendazole (Panacur, produced by Hoechst, F. R. G.), a new antihelminthic preparation. The tests were performed in sheep naturally invaded by gastrointestinal and lung nematodes. Helminthological dissection performed 7 days after the application of 5 mg of fenbendazole per 1 kg of sheep weight proved 100% effectiveness on lungworms (Dictyocaulus filaria) and on the following gastrointestinal helminths: Ostertagia ostertagi, Haemonchus contortus, Bunostomum trigonocephalum, Strongyloides papilosus, Chabertia ovina, Oesophagostomum venulosum, Trichostrongylus spp., and Nematodirus filicollis. The effect on the Trichocephalus ovis species was low and statistically insignificant (37.8%). The tolerance to the chemical was good even in sheep in a very bad condition.