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A regional model of sheep lice management practices for predicting the impact of treatment for lice when no lice are detected


Horton, BJ and Bailey, A and Carew, AL, A regional model of sheep lice management practices for predicting the impact of treatment for lice when no lice are detected, Animal Production Science, 56, (1) pp. 24-32. ISSN 1836-0939 (2016) [Refereed Article]

Copyright Statement

Copyright 2015 CSIRO

DOI: doi:10.1071/AN14474


A model of sheep lice management incorporating different assumed levels of lice prevalence in different regions of Australia was used to determine the conditions under which it would be cost-effective to treat sheep for lice at shearing when no lice had been detected. The probability that a flock might be infested was calculated from the probability that the previous treatment had failed to eradicate lice, purchased sheep may have introduced lice, or lice may have entered on straying sheep. The model showed that a flock should be treated if the probability of infestation is greater than 10%. It was projected that acceptance of a risk level greater than 10% would reduce treatment of flocks where no lice were present, thus reducing treatment costs. This higher risk level, however, would increase the proportion of louse-infested flocks that remained untreated, resulting in increased direct lice costs and an increase in the regional prevalence of lice, but little overall change in costs to the sheep industry. The model indicated that treatment of sheep at lower levels of risk (less than 10%) would incur unnecessary costs due to treatment of flocks where no lice were present and would not reduce the regional prevalence of lice more effectively than a 10% intervention level. The model suggested that more accurate methods of detecting lice at shearing would allow higher levels of risk, reduce the use of treatment and hence reduce overall costs associated with managing lice, without increasing the prevalence of lice.

Item Details

Item Type:Refereed Article
Keywords:intervention, lice detection, lice infested, risk
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Animal production
Research Field:Animal management
Objective Division:Animal Production and Animal Primary Products
Objective Group:Livestock raising
Objective Field:Sheep for wool
UTAS Author:Horton, BJ (Dr Brian Horton)
UTAS Author:Bailey, A (Mr Andrew Bailey)
UTAS Author:Carew, AL (Dr Anna Carew)
ID Code:100660
Year Published:2016
Web of Science® Times Cited:2
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2015-05-25
Last Modified:2018-02-02

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