The efficacy of injectable and pour-on formulations of moxidectin against lice on cattle
1993
Chick, B. (Veterinary Health Research Pty Ltd, Armidale (Australia)) | McDonald, D. (Agrisearch Services Pty Ltd, Shepparton (Australia)) | Cobb, R. (Cyanamid Australia Pty Ltd, Baulkham Hills (Australia)) | Kieran, P.J. (Cyanamid International (Singapore)) | Wood, I. (American Cyanamid Co., Princeton (USA))
The efficacy of one administration of moxidectin against natural infestations of the 3 common species of cattle lice in Australia: Linognathus vituli, Damalinia bovis and Haematopinus eurysternus, was determined. A high degree of control of L vituli (the long-nosed sucking louse) was achieved with both the cattle injection (96.7 percent and 100 percent) at 0.2 mg per kg and the cattle pour-on formulation (94.6 and 100 percent) at 0.5 mg per kg on the 2 farms where this louse occurred. An injection of moxidectin at 0.2 mg per kg did not eliminate D bovis. In these trials efficacy ranged from nil to 85.2 percent. In contrast the pour-on formulation at 0.5 mg per kg provided consistently high efficacy (83.6 to 100 percent) against D bovis on 3 farms. Infestations of H eurysternus (the short-nosed sucking louse) were low and no significant difference was recorded between treatment groups in a single trial, however, lice persisted on 3 to 7 cattle in the untreated group at each inspection, whereas none were found on any animals in the 2 groups treated with moxidectin on inspection after treatment.
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