[Efficacy of levimasole and nilverm on gastrointestinal nematodes in cattle and their effect on milk yield]

Effect of Levamisole and Nilverm on gastrointestinal nematodes in cattle and on the milk yield. The effect of Levamisole--pure substance and the preparation Nilverm on the milk yield of cattle was experimentally tested, however, significant positive results were not recorded. Following Nilverm application and after the experiments had been terminated, t-test showed significant daily decrease (2.5 l) in milk yield in the treated animals when compared to the controls. This decrease was directly proportional to the resumed increase in the extensity of invasion with gastrointestinal nematodes recorded after the treatment had been terminated. Regarding that the possibility of reinvasion of animals in cow sheds could be excluded and that the extensity of invasion with gastrointestinal nematodes was higher in the treated cows than in the controls at the end of the experiments, we assume that following the eradication of adult nematodes with anthelmintics activation of hypobiotic worm larvae occurred in the mucosa.