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Effects on mastitis of overmilking in conjunction with pulsation failure

Published online by Cambridge University Press:  01 June 2009

Graeme A. Mein ,
Murray R. Brown  and
David M. Williams
Graeme A. Mein
Affiliation:
Milking Research Centre, Institute of Dairy Technology, Werribe, Victoria 303, Australia
Murray R. Brown
Affiliation:
Milking Research Centre, Institute of Dairy Technology, Werribe, Victoria 303, Australia
David M. Williams
Affiliation:
Milking Research Centre, Institute of Dairy Technology, Werribe, Victoria 303, Australia
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Summary

Half-udder comparisons were made using 56 cows for 2 months, in an experiment involving high bacterial challenge, to assess the combined effects of 5 min overmilking and pulsation failure (resulting from the use of shortened teatcup liners) on teat condition and mastitis. Only three new infections were confirmed in over 12500 quarter milkings in quarters milked with control liners (of 148 mm effective length) indicating little or no effect of prolonged overmilking in these quarters. A 3·5-fold increase in the new infection rate (NIR) based on bacteriological diagnosis alone (P < 0·01), or a 9-fold increase in NIR based on bacteriological diagnosis plus raised cell count and/or N-acetyl-β-D-glucosaminidase (P < 0·01), occurred in quarters milked with the same liners shortened to an effective length of 120–130 mm. The mean interval to infection or teat canal colonization (41 ν. 60 milkings), and for a quarter infection to be confirmed by other diagnostic tests (45 ν. 79 milkings) was significantly less in quarters overmilked with short liners. The results confirm that NIR increases whenever pulsation fails. Overmilking may increase NIR when it is associated with pulsation failure.

Type
Original Articles
Information
Journal of Dairy Research , Volume 53 , Issue 1 , February 1986 , pp. 17 - 22
Copyright
Copyright © Proprietors of Journal of Dairy Research 1986

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References

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