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Machine-induced teat tissue reactions and infection risk in a dairy herd free from contagious mastitis pathogens

Published online by Cambridge University Press:  01 June 2009

Alfonso Zecconi ,
Jörn Hamann ,
Valerio Bronzo  and
Gianfranco Ruffo
Alfonso Zecconi
Affiliation:
Istituto di Malattie Infettive, Università degli Studi di Milano, Via Celoria 10, 20133 Milano, Italia
Jörn Hamann
Affiliation:
Institut für Hygiene, Bundesanstalt für Milchforschung, Hermann Weigmann Strasse, 12300 Kiel, Deutschland
Valerio Bronzo
Affiliation:
Istituto di Malattie Infettive, Università degli Studi di Milano, Via Celoria 10, 20133 Milano, Italia
Gianfranco Ruffo
Affiliation:
Istituto di Malattie Infettive, Università degli Studi di Milano, Via Celoria 10, 20133 Milano, Italia
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Summary

Machine-induced changes in teat thickness were measured in a randomly selected group of 22 cows from a commercial dairy herd consisting of 110 cows during an experiment lasting 1 year. Half the cows used were free from mastitis whereas the remainder had at least one quarter infected by environmental pathogens. Teats were classified according to a threshold change in teat end thickness of 5%. The relationships between quarter infection or teat duct colonization and teat end thickness changes induced by machine milking were investigated. Teats with > 5% change in thickness had significantly increased teat duct colonization and a slight, non-significant, increase in quarter infection. We conclude that machine-induced changes in teat end thickness are predisposing factors for teat duct colonization by environmental pathogens. This may provid: an increased new infection risk, especially when hygiene is poor.

Type
Original Articles
Information
Journal of Dairy Research , Volume 59 , Issue 3 , August 1992 , pp. 265 - 271
Copyright
Copyright © Proprietors of Journal of Dairy Research 1992

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References

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