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  • Title: Reduced activity of levamisole against Ostertagia ostertagi in dairy calves.
    Author: Lyons ET, Tolliver SC, Drudge JH, Hemken RW, Button FS.
    Journal: Mod Vet Pract; 1981 Nov; 62(11):847-50. PubMed ID: 7038437.
    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.
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