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Sheep blowfly strike: the cost of control in relation to risk

Published online by Cambridge University Press:  07 May 2019

K. Lihou Open the ORCID record for K. Lihou [Opens in a new window]  and
R. Wall
K. Lihou*
Affiliation:
Veterinary Parasitology and Ecology Group, School of Biological Sciences, University of Bristol, Bristol BS8 1UG, UK
R. Wall
Affiliation:
Veterinary Parasitology and Ecology Group, School of Biological Sciences, University of Bristol, Bristol BS8 1UG, UK
*
†E-mail: [email protected]
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Abstract

Sheep blowfly strike (ovine cutaneous myiasis) is a widespread economic and welfare problem in sheep husbandry in many parts of the world. Strike incidence is determined by a complex interaction of fly abundance, host susceptibility and climate, combined with farmer husbandry and intervention strategies. Sheep farmers adopt a range of approaches to the type and timing of the management used for the control of blowfly strike, the rational basis for which is often not robust. Here a deterministic model, based on existing data relating to fly abundance, seasonal risk and strike incidence, is used to compare the variable costs associated with different strike management strategies. The model shows that not employing prophylactic treatment is the lowest cost strategy only where strike risk is low. In all other circumstances, prophylactic treatment incurs lower costs than not doing so, because the deaths associated with strike outweigh the costs of prophylactic treatment. Lamb treatment, in particular, has a substantial effect on strike and cost reduction, since lambs are the most abundant age-class of animals and are at the highest risk over the period when fly abundance is the greatest. Early-season treatment of ewes before shearing is also an important component of the lowest cost strategies, particularly when the blowfly season is extended. While the rational choice of the most appropriate strike management strategy is essential in the context of farm economics, welfare considerations lend added importance to treatment decisions that reduce strike incidence.

Keywords

myiasiscost-effectivediseaselivestockectoparasite
Type
Research Article
Information
animal , Volume 13 , Issue 10 , October 2019 , pp. 2373 - 2378
Copyright
© The Animal Consortium 2019 

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References

Agriculture and Horticulture Development Board 2016. Stocktake report 2016. Retrieved on 5 November 2018 from http://beefandlamb.ahdb.org.uk/wp-content/uploads/2016/11/Beef-Lamb-Stocktake-Report-2016-281116.pdf Google Scholar
Agriculture and Horticulture Development Board 2017. Seasonal increase in cull ewe price. Retrieved on 5 November 2018 from http://beefandlamb.ahdb.org.uk/market-intelligence-news/seasonal-increase-cull-ewe-price/ Google Scholar
Agriculture and Horticulture Development Board 2018. Deadweight sheep prices. Retrieved on 5 November 2018 from http://beefandlamb.ahdb.org.uk/markets/deadweight-price-reports/deadweight-sheep-price-reporting/ Google Scholar
Bates, PG 2004. Therapies for ectoparasitism in sheep. In Practice Nov/Dec 26,538–547.CrossRefGoogle Scholar
Bisdorff, B, Milnes, A and Wall, R 2006. Prevalence and regional distribution of scab, lice and blowfly strike in sheep in Great Britain. Veterinary Record 158, 749–752.CrossRefGoogle ScholarPubMed
Bisdorff, B and Wall, R 2008. Sheep blowfly strike risk management in Great Britain: a survey of current practice. Medical and Veterinary Entomology 22, 303–308.CrossRefGoogle ScholarPubMed
Broughan, JM and Wall, R 2007a. Fly abundance and climate as determinants of sheep blowfly strike incidence. Medical and Veterinary Entomology 21, 231–238.CrossRefGoogle ScholarPubMed
Broughan, JM and Wall, R 2007b. Faecal soiling and gastrointestinal helminth infection in lambs. International Journal of Parasitology 37, 1255–1268.CrossRefGoogle ScholarPubMed
Chivers, CA, Rose Vineer, H and Wall, R 2018. The prevalence and distribution of sheep scab in Wales: A farmer questionnaire survey. Medical and Veterinary Entomology 32, 244–250.CrossRefGoogle Scholar
Department for Environment, Food and Rural Affairs 2018. United Kingdom slaughter statistics –- October 2018. Retrieved on 16 November 2018 from https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/756269/slaughter-statsnotice-15nov18.pdf Google Scholar
Department of Agriculture, Environment and Rural Affairs 2018. Agricultural rates of pay, orders and reports. Retrieved on 19 November 2018 from https://www.daera-ni.gov.uk/articles/awb-agricultural-rates-pay-orders-and-reports Google Scholar
Environment Agency 2009. How to comply with your environmental permit. Additional guidance for: the textile sector (EPR 6.05), Environment Agency, Bristol, UK.Google Scholar
French, NP, Wall, R, Cripps, PJ and Morgan, KL 1992. Prevalence, regional distribution and control of blowfly strike in England and Wales. Veterinary Record 131, 337–342.CrossRefGoogle ScholarPubMed
French, NP, Wall, R and Morgan, KL 1994. Ectoparasite control on sheep farms in England and Wales; the method, type and timing of insecticide application. Veterinary Record 135, 35–38.CrossRefGoogle Scholar
French, NP, Wall, R and Morgan, KL 1995. The seasonal pattern of sheep blowfly strike in England and Wales. Medical and Veterinary Entomology 9, 1–8.CrossRefGoogle ScholarPubMed
French, NP and Morgan, KL 1996. Role of neonatal and maternal risk factors in the faecal soiling of lambs. Veterinary Record 139, 460–465.CrossRefGoogle ScholarPubMed
Graf, JF 1993. The role of insect growth regulators in arthropod control. Parasitology Today 9, 471–474.CrossRefGoogle ScholarPubMed
Morgan, ER and Wall, R 2009. Climate change and parasitic disease: farmer mitigation? Trends in Parasitology 25, 308–313.CrossRefGoogle ScholarPubMed
Pitts, KM and Wall, R 2005. Winter survival of larvae and pupae of the blowfly, Lucilia sericata (Diptera: Calliphoridae). Bulletin of Entomological Research 95, 179–186.CrossRefGoogle Scholar
Pitts, KM and Wall, R 2006. Cold shock and cold tolerance in larvae and pupae of the blowfly, Lucilia sericata. Physiological Entomology 31, 57–62.CrossRefGoogle Scholar
Rose, H and Wall, R 2011. Modelling the impact of climate change on spatial patterns of disease risk: sheep blowfly strike in Great Britain. International Journal of Parasitology 41, 739–746.CrossRefGoogle ScholarPubMed
Smith, KE and Wall, R 1998. Estimates of population density and dispersal in the blowfly Lucilia sericata (Diptera: Calliphoridae). Bulletin of Entomological Research 88, 65–73.CrossRefGoogle Scholar
Snoep, JJ, Sol, J, Sampimon, OC, Roeters, N, Elbers, ARW, Scholten, HW and Borgsteede, FHM 2002. Myiasis in sheep in The Netherlands. Veterinary Parasitology 106, 357–363.CrossRefGoogle ScholarPubMed
Wall, R, French, NP and Morgan, K 1992a. Blowfly species composition in sheep myiasis in Britain. Medical and Veterinary Entomology 6, 177–178.CrossRefGoogle ScholarPubMed
Wall, R, French, N and Morgan, KL 1992b. Effects of temperature on the development and abundance of the sheep blowfly Lucilia sericata (Diptera, Calliphoridae). Bulletin of Entomological Research 82, 125–131.CrossRefGoogle Scholar
Wall, R and Ellse, L 2011. Climate change and livestock disease: integrated management of blowfly strike in a warmer environment. Global Change Biology 17, 1770–1777.CrossRefGoogle Scholar
Wall, R and Lovatt, F 2015. Blowfly strike: biology, epidemiology and control. In practice 37, 181–188.CrossRefGoogle Scholar