Quantitative analysis of antibiotic usage in British sheep flocks

Davies, Peers and Remnant, John G. and Green, Martin J. and Gascoigne, Emily and Gibbon, Nick and Hyde, Robert and Porteous, Jack R. and Schubert, Kiera and Lovatt, Fiona and Corbishley, Alexander (2017) Quantitative analysis of antibiotic usage in British sheep flocks. Veterinary Record . ISSN 2042-7670

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Abstract

The aim of this study was to examine the variation in antibiotic usage between 207 commercial sheep flocks using their veterinary practice prescribing records. Mean and median prescribed mass per population corrected unit (mg/PCU) was 11.38 and 5.95, respectively and closely correlated with animal defined daily dose (ADDD) 1.47 (mean), 0.74 (median) (R2=0.84, P<0.001). This is low in comparison with the suggested target (an average across all the UK livestock sectors) of 50 mg/PCU. In total, 80 per cent of all antibiotic usage occurred in the 39 per cent of flocks where per animal usage was greater than 9.0 mg/PCU. Parenteral antibiotics, principally oxytetracycline, represented 82 per cent of the total prescribed mass, 65.5 per cent of antibiotics (mg/PCU) were prescribed for the treatment of lameness. Oral antibiotics were prescribed to 49 per cent of flocks, 64 per cent of predicted lamb crop/farm. Lowland flocks were prescribed significantly more antibiotics than hill flocks. Variance partitioning apportioned 79 per cent of variation in total antibiotic usage (mg/PCU) to the farm level and 21 per cent to the veterinary practice indicating that veterinary practices have a substantial impact on overall antimicrobial usage. Reducing antibiotic usage in the sheep sector should be possible with better understanding of the drivers of high usage in individual flocks and of veterinary prescribing practices.

Item Type: Article
Additional Information: © British Veterinary Association (unless otherwise stated in the text of the article) 2017
Schools/Departments: University of Nottingham, UK > Faculty of Medicine and Health Sciences > School of Veterinary Medicine and Science
Identification Number: 10.1136/vr.104501
Depositing User: Eprints, Support
Date Deposited: 30 Oct 2017 10:54
Last Modified: 01 Nov 2017 19:28
URI: http://eprints.nottingham.ac.uk/id/eprint/47659

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