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215. The value of indirect methods for the detection of mastitis

Published online by Cambridge University Press:  01 June 2009

S. J. Rowland  and
M. Zein-El-Dine
S. J. Rowland
Affiliation:
Department of Agricultural Chemistry, University of Reading
M. Zein-El-Dine
Affiliation:
Department of Agricultural Chemistry, University of Reading
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Extract

The following indirect tests for the detection of subclinical mastitis were applied, under bacteriological control, to a series of milk samples from the individual quarters of cows in full milk: presence of clots, reaction to bromcresol-purple, reaction to brom-thymol-blue, amount and character of centrifuge deposit, catalase content, chloride content, casein number and solids-not-fat content.

These tests detected 12, 61, 14, 55, 49, 77, 91, and 63% respectively of the infected quarters, and diagnosed 0, 16, 0, 3, 34, 0, 8, and 9% of the uninfected quarters as infected.

For each indirect test the mean square contingency was calculated as a measure of agreement between it and the direct bacteriological method. The tests were placed in the descending order of their value for diagnosis thus: casein number, chloride content, centrifuge deposit, solids-not-fat content, brom-cresol-purple reaction, brom-thymol-blue reaction, presence of clots, catalase content.

Type
Original Articles
Information
Journal of Dairy Research , Volume 10 , Issue 1 , January 1939 , pp. 108 - 113
Copyright
Copyright © Proprietors of Journal of Dairy Research 1939

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References

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