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Stochastic modelling to assess economic effects of treatment of chronic subclinical mastitis caused by Streptococcus uberis

Published online by Cambridge University Press:  09 October 2007

Wilma Steeneveld ,
Jantijn Swinkels  and
Henk Hogeveen
Wilma Steeneveld*
Affiliation:
Business Economics, Wageningen University, Wageningen, The Netherlands
Jantijn Swinkels
Affiliation:
Innovet Bovine Herd Health Consultancy, Noordbeemster, 1463 PJ, The Netherlands
Henk Hogeveen
Affiliation:
Business Economics, Wageningen University, Wageningen, The Netherlands Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands
*
†For correspondence; e-mail: w.steeneveld@uu.nl
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Abstract

Chronic subclinical mastitis is usually not treated during the lactation. However, some veterinarians regard treatment of some types of subclinical mastitis to be effective. The goal of this research was to develop a stochastic Monte Carlo simulation model to support decisions around treatment of chronic subclinical mastitis caused by Streptococcus uberis. Factors in the model included the probability of cure after treatment, probability of the cow becoming clinically diseased, transmission of infection to other cows, and physiological effects of the infection. Using basic input parameters for Dutch circumstances, the average economic costs per cow of an untreated chronic subclinical mastitis case caused by Str. uberis in a single quarter from day of diagnosis onwards was €109. With treatment, the average costs were higher (€120). Thus, for the average cow, treatment was not efficient economically. However, the risk of high costs was much higher when cows with chronic subclinical mastitis were not treated. A sensitivity analysis showed that profitability of treatment of chronic subclinical Str. uberis mastitis depended on farm-specific factors (such as economic value of discarded milk) and cow-specific factors (such as day of diagnosis, duration of infection, amount of transmission to other cows and cure rate). Therefore, herd level protocols are not sufficient and decision support should be cow specific. Given the importance of cow-specific factors, information from the current model could be applied to automatic decision support systems.

Keywords

Subclinical mastitisantibiotic treatmenteconomicdairy cattleStreptococcus uberis
Type
Research Article
Information
Journal of Dairy Research , Volume 74 , Issue 4 , November 2007 , pp. 459 - 467
Copyright
Copyright © Proprietors of Journal of Dairy Research 2007

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