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Effects of long wool insecticide treatment on lice members and wool damage on sheep

Citation

Campbell, NJ and James, PJ and Horton, BJ, Effects of long wool insecticide treatment on lice members and wool damage on sheep, Animal Production Science, 56, (1) pp. 33-37. ISSN 1836-0939 (2016) [Refereed Article]

Copyright Statement

Copyright CSIRO 2016

DOI: doi:10.1071/AN14426

Abstract

Merino sheep infested with lice (Bovicola ovis) and with 8 months’ wool were hand jetted with a commercial spinosad formulation or treated with an α-cypermethrin backline product to examine the effect of long wool treatment on lice numbers and wool damage, relative to untreated controls. Mean lice numbers were reduced significantly (P < 0.05) by treatment and then remained relatively constant until shearing 20 weeks later. Treatment with either product resulted in significant improvements in mean clean and greasy wool cut, yield, staple length, both visually assessed and measured colour, and the proportion of fleeces classed into the main fleece line. There was no significant difference between the two treatments in either efficacy in reducing louse numbers or on production characters. Wool rub score and cotting assessed on the sheep increased slightly after treatment and then did not change until shearing whereas both scores increased significantly in the untreated group. There was a strong relationship between the visual rub score and the loss of wool at shearing, indicating that rub score can be a good predictor of lice-induced reduction in fleece weights.

Item Details

Item Type:Refereed Article
Keywords:lice, insecticide, wool, sheep
Research Division:Agricultural and Veterinary Sciences
Research Group:Animal Production
Research Field:Animal Protection (Pests and Pathogens)
Objective Division:Animal Production and Animal Primary Products
Objective Group:Livestock Raising
Objective Field:Sheep - Wool
Author:Horton, BJ (Dr Brian Horton)
ID Code:106059
Year Published:2016
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2016-01-27
Last Modified:2017-04-12
Downloads:0

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