Therapeutic efficacy of zeta-cypermethrin pour-on for the treatment of biting and sucking lice in cattle under field conditions.
OBJECTIVE
To assess the efficacy of zeta-cypermethrin pour-on to control cattle lice.


METHODS
Five field trials in south-eastern Australia.


METHODS
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.


RESULTS
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 B bovis and H eurysternus and gave good control of L vituli and S capillatus. Zeta-cypermethrin at 1 mg/kg gave good control of B bovis and H eurysternus but was not satisfactory against L vituli and S capillatus.


CONCLUSIONS
Zeta-cypermethrin pour-on, given at 2.5 mg/kg, is an effective treatment for cattle lice control. Zeta-cypermethrin, and other synthetic pyrethroid pour-ons, are the treatment of choice to control B bovis.
D000279:Administration, Cutaneous; D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000188:drug therapy* / Q000517:prevention & control*; D007306:Insecticides / Q000008:administration & dosage / Q000627:therapeutic use*; D010373:Lice Infestations / Q000188:drug therapy / Q000517:prevention & control / Q000662:veterinary*; D008003:Phthiraptera; D011722:Pyrethrins / Q000008:administration & dosage / Q000627:therapeutic use*; D016896:Treatment Outcome