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Persistent efficacy of doramectin and moxidectin against Cooperia oncophora infections in cattle
S M Taylor1, J P Le Stang, J Kenny
1Vetpar Services, 8 Grey Point, Helens Bay, BT19 1LE, Bangor, UK. stuart_m.taylor@virgin.net
Abstract:
Duplicate studies in France and Northern Ireland were carried out to determine the persistent efficacy of topical moxidectin and doramectin against natural infections of Cooperia oncophora. In each study, groups of 15 nematode-naïve calves were treated either with topical doramectin or moxidectin, and put out to graze on pasture contaminated with C. oncophora infective larvae. The persistent efficacy for preventing establishment of infection was assessed by the time to faecal egg excretion of C. oncophora eggs. It was found that the moxidectin treatment prevented infection for less than 10 days and the effect of doramectin lasted for 24 days.
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