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Journal of Dairy Science Vol. 75 No. 2 606-614
© 1992 by American Dairy Science Association ®
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Electrical Conductivity of Milk: Measurement, Modifiers, and Meta Analysis of Mastitis Detection Performance

M. Nielen 1, H. Deluyker 1, Y. H. Schukken 1, and A. Brand 1

1 Department of Herd Health and Reproduction, University of Utrecht, Yalelaan 7, 3584 CL Utrecht, The Netherlands and The Upjohn Company, Genevestraat 10, 1140 Brussels, Belgium

The physics, physiology, and pathology of electrical conductivity of milk are described. Based on a meta analysis, the use of electrical conductivity as a mastitis detection tool is discussed. Most reports were based on subclinical mastitis data. The gold standards of the different reports are discussed. With an overall sensitivity of 66% and an overall specificity of 94%, the predictive value of a positive electrical conductivity test remains low in a low prevalence population. The use of on-line systems for clinical mastitis detection is discussed. Online systems that combine multiple data and perform multifactorial analyses will be of interest to the dairy industry.

Key Words: electrical conductivity • bovine mastitis • detection • meta analysis

Submitted on July 10, 1991
Accepted on September 23, 1991




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Copyright © 1992 by the American Dairy Science Association ®.