Efficacy of a pour-on formulation of doramectin against lice, mites, and grubs of cattle

Publication Type:Journal Article
Year of Publication:1999
Authors:K. A. Rooney, Illyes, E. F., Sunderland, S. J., Sarasola, P., Hendrickx, M. O., Keller, D. S., Meinert, T. R., Logan, N. B., Weatherley, A. J., Conder, G. A.
Journal:American Journal of Veterinary Research
Volume:60
Issue:4
Pagination:402 - 404
Date Published:1999
ISBN Number:0002-9645
Keywords:Administration, Topical, animals, Anoplura, anthelmintic, cattle, Cattle Diseases, Diptera, Hypodermyiasis, insecticide, Ivermectin/administration & dosage/analogs & derivatives/therapeutic use, Lice Infestations/drug therapy/veterinary, Mallophaga, Mite Infestations/drug therapy/veterinary, Sarcoptes scabiei, Treatment Outcome
Abstract:

OBJECTIVE: To determine effectiveness of a pour-on formulation of doramectin against Damalinia bovis, Haematopinus eurysternus, Linognathus vituli, Solenopotes capillatus, Chorioptes bovis, Sarcoptes scabiei, Hypoderma bovis, and Hypoderma lineatum. ANIMALS: Cattle of various ages with naturally acquired or artificial infestations with 1 or more species of lice, mites, or grubs. PROCEDURE: In 10 louse and 6 mite studies, cattle were treated with doramectin (500 microg/kg, topically) on day 0, and parasite counts were performed approximately weekly from days 0 to 35. In 6 grub studies, cattle expected to harbor Hypoderma spp were treated before emergence of warbles. After warbles began to emerge, they were counted every 2 weeks, and grubs were collected and identified by species. RESULTS: Burdens of D bovis, H eurystemus, L vituli, and S capillatus on doramectin-treated cattle were 0 by 28 days after treatment. Burdens of C bovis and S scabiei decreased to 0 in naturally infested cattle and approximately 0 in artificially infested cattle by day 14 to 15. In grub studies, 107 of 136 control cattle had warbles, whereas 2 of 136 doramectin-treated cattle had 1 warble each, which represented a cure rate of 98.5%. CONCLUSION AND CLINICAL RELEVANCE: One topical application of doramectin was highly efficacious against common species of lice, mites, and grubs known to affect performance, health, and appearance of cattle.

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