title: Reduced activity of levamisole against Ostertagia ostertagi in dairy calves.
abstract: Levamisole bolus formulation was administered in single doses, at rates of 5.8 to 8.1 mg/kg body weight, in 3 controlled tests in male dairy calves (n = 22) in Kentucky. Removals of natural infections of adult Ostertagia ostertagi were 70% and 76% for calves from a hear with a history of regular treatments with levamisole and 85% for calves from a herd receiving levamisole occasionally. Activity against other abomasal nematodes and lungworms was also evaluated.
mesh_terms: D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000188:drug therapy*; D002986:Clinical Trials as Topic; D007978:Levamisole / Q000008:administration & dosage / Q000627:therapeutic use*; D008297:Male; D010029:Ostertagiasis / Q000188:drug therapy / Q000469:parasitology / Q000662:veterinary*; D014251:Trichostrongyloidea / Q000187:drug effects; D014252:Trichostrongyloidiasis / Q000662:veterinary*
chemical_list: D007978:Levamisole