Therapeutic efficacy of zeta-cypermethrin pour-on for the treatment of biting and sucking lice in cattle under field conditions

摘要

Five field trials were carried out in south-eastern Australia to assess the efficacy of zeta-cypermethrin pour-on to control cattle lice. Zeta-cypermethrin pour-on, deltamethrin pour-on and pour-on vehicle were applied to groups of 10 cattle. Lice were counted before treatment and 14, 28, 42 and 56 days after treatment. Zeta-cypermethrin pour-on given at 2.5 mg/kg was equivalent to, or marginally more effective than a deltamethrin pour-on at 0.75 mg/kg. It eliminated Bovicola bovis and Haematopinuseurysternus and gave good control of Linognathus vituli and Solenopotes capillatus. Zeta-cypermethrin at 1 mg/kg good control of B. bovis and H. eurysternus but was not satisfactory against L. vituli and S. capillatus. It is concluded that zeta-cypermethrin pour-on, given at 2.5 mg/kg, is an effective treatment for cattle lice control.