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Factors associated with the presence and prevalence of contagious ovine digital dermatitis : a 2013 study of 1136 random English sheep flocks

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Dickins, Alan, Clark, Corinna C. A., Kaler, Jasmeet, Ferguson, Eamonn, O'Kane, Holly and Green, Laura E. (2016) Factors associated with the presence and prevalence of contagious ovine digital dermatitis : a 2013 study of 1136 random English sheep flocks. Preventive Veterinary Medicine, 130 . pp. 86-93. doi:10.1016/j.prevetmed.2016.06.009 ISSN 0167-5877.

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Official URL: http://dx.doi.org/10.1016/j.prevetmed.2016.06.009

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Abstract

In 2013, a questionnaire was used to gather data on risks for introduction, and factors associated with prevalence, of contagious ovine digital dermatitis (CODD). There were 1136 (28.4%) usable responses from 4000 randomly selected sheep farmers in England. CODD was present in 58% (662) of flocks, with a reported prevalence of CODD lesions of 2.3%. The geometric mean period prevalence of all lameness was 4.2% and 2.8% in CODD positive and negative flocks respectively. Factors associated with a greater risk of presence of CODD were purchasing replacement ewes, not always checking the feet of sheep before purchase, not isolating purchased sheep, foot bathing returning ewes, foot trimming the flock more than twice in the year all compared with not doing these activities and increasing log10 flock size. Farmers who vaccinated sheep with Footvax™ were less likely to report presence of CODD. Factors associated with increasing prevalence of CODD lesions were not always checking the feet of purchased sheep, flocks that mixed with other flocks and sheep that left the farm for summer grazing and later returned. In addition, flocks where farmers followed the current recommended managements for control of footrot, had a lower prevalence of CODD whilst those who used foot bathing and where feet bled during routine foot trimming had a higher prevalence of CODD. The prevalence of CODD decreased with each log10 increase in flock size. We conclude that CODD is an infectious cause of lameness in sheep of increasing importance in GB. Introduction is linked to poor biosecurity with one likely source of the pathogen being introduction of or mixing with infected sheep. As with footrot, prevalence of CODD was lower in flocks where farmers focused on individual treatment to manage lameness and avoided foot bathing and trimming feet. We conclude that most of the currently recommended biosecurity and treatment approaches to control footrot in GB are also effective for control of CODD.

Item Type: Journal Article
Subjects: S Agriculture > SF Animal culture
Divisions: Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- )
Library of Congress Subject Headings (LCSH): Sheep -- Diseases -- Prevention -- Great Britain, Livestock -- Health aspects, Lameness in sheep -- Questionnaires, Footrot in sheep -- Questionnaires
Journal or Publication Title: Preventive Veterinary Medicine
Publisher: Elsevier
ISSN: 0167-5877
Official Date: 16 June 2016
Dates:
DateEvent
16 June 2016Available
14 June 2016Accepted
24 November 2015Submitted
Volume: 130
Page Range: pp. 86-93
DOI: 10.1016/j.prevetmed.2016.06.009
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 14 June 2016
Date of first compliant Open Access: 16 June 2017
Funder: Great Britain. Department for Environment, Food and Rural Affairs (DEFRA), Biotechnology and Biological Sciences Research Council (Great Britain) (BBSRC), AHDB Beef & Lamb (Great Britain)
Grant number: AW0512 (DEFRA), BB/M012980/1, BB/M012964/1 (BBSRC)
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