Anthelmintic Efficacy of Tetramisole against Naturally and Experimentally Infecting Dictyocaulusviviparus in Calves

Upon 42 calves experimentally infected and 63 calves naturally infected with the lungworm, Dictyocaulus viviparus, the effects of both oral and intramusscular administration with dl- and l-tetramisole were examinaed. The high anthelmintic activity of tetramisole was revealed on lungworms more than 14 days of age.The efficacy of 12.5-15mg/kg of dl-tetramisole was equal to that of 7.5mg/kg of l-tetramisole. The efficacy did not differ between the two routes of administration. It included satisfactory body weight gain and alleviation of pneumonia.