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Influence of intramammary infection of a single gland in dairy cows on the cow's milk quality

Published online by Cambridge University Press:  02 July 2015

Dror Bezman ,
Liubov Lemberskiy-Kuzin ,
Gil Katz ,
Uzi Merin  and
Gabriel Leitner
Dror Bezman
Affiliation:
AfiMilk, Afikim 1514800, Israel
Liubov Lemberskiy-Kuzin
Affiliation:
AfiMilk, Afikim 1514800, Israel
Gil Katz
Affiliation:
AfiMilk, Afikim 1514800, Israel
Uzi Merin
Affiliation:
AfiMilk, Afikim 1514800, Israel
Gabriel Leitner*
Affiliation:
National Mastitis Reference Center, Kimron Veterinary Institute, P.O. Box 12, Bet Dagan 50250, Israel
*
*For correspondence; e-mail: [email protected]
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Abstract

Intramammary infection (IMI), comprises a group of costly diseases affecting dairy animals worldwide. Many dairy parlours are equipped with on-line computerised data acquisition systems designed to detect IMI. However, the data collected is related to the cow level, therefore the contribution of infected glands to the recorded parameters may be over estimated. The present study aimed at evaluating the influence of single gland IMI by different bacteria specieson the cow's overall milk quality. A total of 130 cows were tested 239 times; 79 cows were tested once and the others were examined 2–8 times. All of the analysed data refer to the number of tests performed, taking into account the repeated testing of the same cows. Of the cows tested ~50% were free of infection in all 4 glands and the others were infected in one gland with different coagulase negative staphylococci (CNS), Streptococcus dysgalactiae, or were post infected with Escherichia coli (PIEc), i.e., free of bacterial infection at the time of sampling but 1–2 months after clinical infection by E. coli. Overall, infection with bacteria had significant effects on somatic cell count (SCC) and lactose concentration. Examining each bacterium reveals that the major influence on those parameters was the sharp decrease in lactose in the PIEc and curd firmness in PIEc and Strep. Individual gland milk production decreased ~20% in Strep. dysgalactiae- and ~50% in PIEc-infected glands with respect to glands with no bacterial findings. Significant differences were found in lactose, SCC, rennet clotting time and curd firmness in the milk of infected glands and among those, these parameters were significantly higher in Strep. dysgalactiae and PIEc than in CNS infected cows. The current results using quarter-milking reinforces the importance of accurate IMI detection in relation to economic and welfare factors, and moreover, emphasises the need for technical sensing and constant reporting to the farmer about changes in the milk quality of every animal.

Keywords

Mammary glandcow milk qualityintramammary infectionautomatic sensing
Type
Research Article
Information
Journal of Dairy Research , Volume 82 , Issue 3 , August 2015 , pp. 304 - 311
Copyright
Copyright © Proprietors of Journal of Dairy Research 2015 

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