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Deterministic model to evaluate the impact of lactational treatment of subclinical mastitis due to coagulase-negative staphylococci

Published online by Cambridge University Press:  21 July 2011

Ricardo Bexiga ,
Kathryn A Ellis ,
Cristina L Vilela  and
Dominic J Mellor
Ricardo Bexiga*
Affiliation:
Faculdade de Medicina Veterinária, Universidade Técnica de Lisboa, Avenida da Universidade Técnica, 1300-477 Lisboa, Portugal
Kathryn A Ellis
Affiliation:
Scottish Centre for Production Animal Health and Food Safety, Large Animal Clinical Sciences and Public Health, School of Veterinary Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, Bearsden, Glasgow, G61 1QH, UK
Cristina L Vilela
Affiliation:
Faculdade de Medicina Veterinária, Universidade Técnica de Lisboa, Avenida da Universidade Técnica, 1300-477 Lisboa, Portugal
Dominic J Mellor
Affiliation:
Scottish Centre for Production Animal Health and Food Safety, Large Animal Clinical Sciences and Public Health, School of Veterinary Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, Bearsden, Glasgow, G61 1QH, UK
*
*For correspondence; e-mail: [email protected]
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Abstract

Coagulase-negative staphylococci (CNS) are the most frequently isolated bacteria from milk samples in several studies worldwide. Despite their relative frequency, specific measures aiming at their control are not well established. One possible measure to include in a control programme is lactational antimicrobial treatment. The decision to perform such treatment, as well as other actions on farm, should be based on the likelihood of financial return. A deterministic model was used to evaluate whether performing an antimicrobial treatment during the lactation for quarters infected with CNS was financially justifiable. Input variables for the impact of CNS on udder health were based on a previous study by the same authors and on available literature on the subject. Prices included in the model were based on 2009/2010 conditions in Portugal. The average result per antimicrobial treated quarter was a net loss of €38·74. Performing a sensitivity analysis to evaluate how systematic variation of the input variables of the model would lead to outcome changes showed that variation in input variables nearly always led to a negative outcome, with the greatest variation in losses observed for variation in the length of treatment and milk withdrawal period (−€46·26 to −€28·49). The situations in which a net benefit was to be expected included the bulk tank somatic cell count decreasing to a level corresponding to a premium payment or to penalties being avoided, and the prevention of transmission of CNS in the milking parlour when the possibility of transmission was at its highest level. For most situations, lactational treatment of CNS subclinical mastitis was not financially justifiable.

Keywords

Deterministic modelCNS mastitislactational therapy
Type
Research Article
Information
Journal of Dairy Research , Volume 78 , Issue 3 , August 2011 , pp. 318 - 325
Copyright
Copyright © Proprietors of Journal of Dairy Research 2011

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