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The diagnosis of subclinical mastitis by redefinition of the interquarter ratio and definition of the interquarter variation using analysis of variance methods

Published online by Cambridge University Press:  01 June 2009

Kim Knudsen  and
Niels Einar Jensen
Kim Knudsen
Affiliation:
Statistical Research Unit, University of Copenhagen, 3 Blegdamsvej, DK-2200 Copenhagen N, Denmark
Niels Einar Jensen
Affiliation:
National Veterinary Laboratory, Aarhus, 2 Hangøvej, DK-8200 Aarhus N, Denmark
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Summary

A definition is proposed for the interquarter ratio of markers of inflammation in the bovine mammary gland which in contrast to present measurement procedures has well-defined distributional properties and thus facilitates statistical analysis. Our proposal of an interquarter ratio is equally applicable to evaluation of both single and multi-sample experiments. Finally, we define a new index for diagnosis of subclinical mastitis at the cow level, the interquarter variation, which assesses the degree of dispersion of the four quarter levels for values of any continuous inflammatory marker.

Type
Original Articles
Information
Journal of Dairy Research , Volume 57 , Issue 3 , August 1990 , pp. 325 - 330
Copyright
Copyright © Proprietors of Journal of Dairy Research 1990

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References

REFERENCES

International Dairy Federation 1987 Bovine mastitis, definition and guidelines for diagnosis. International Dairy Federation Bulletin Document 211Google Scholar
Mattila, T. 1985 Diagnostic problems in bovine mastitis. Dissertation, Department of Pharmacology and Toxicology, College of Veterinary Medicine, Helsinki, FinlandGoogle Scholar