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Influence of pulsationless milking on teat canal keratin growth and turnover

Published online by Cambridge University Press:  01 June 2009

S. Jane Lacy-Hulbert ,
J. Eric Hillerton  and
Murray W. Woolford
S. Jane Lacy-Hulbert
Affiliation:
Dairying Research Corporation Ltd, Private Bag 3123, Ruakura, Hamilton, New Zealand
J. Eric Hillerton
Affiliation:
Institute for Animal Health, Compton Laboratory, Compton, Newbury RG20 7NN, UK
Murray W. Woolford
Affiliation:
Dairying Research Corporation Ltd, Private Bag 3123, Ruakura, Hamilton, New Zealand
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Summary

In two separate experiments, the effects of pulsationless milking and milking vacuum on the rate of keratin removal from the teat canal were determined. Sixteen cows were milked with or without pulsation for either a single milking or for eight milkings. Milking without pulsation removed 10% of keratin present before milking, significantly less than milking with pulsation, which removed 32%. After eight milkings (4 d) without pulsation, up to 20% more keratin had accumulated within the teat canal but the rate of keratin regeneration reduced significantly upon return to pulsation milking. In a second experiment, ten cows were milked at 45 or 55 kPa and with or without pulsation. Only the absence of pulsation significantly reduced keratin loss during milking. Keratin loss during milking appears to be controlled by liner compression rather than by the rate of milk flowing through the teat canal. Pulsationless milking may increase penetrability of the teat canal to bacteria by reducing the natural rate of keratin removal during milking and reducing the rate of keratin regeneration.

Type
Original Articles
Information
Journal of Dairy Research , Volume 63 , Issue 4 , November 1996 , pp. 517 - 524
Copyright
Copyright © Proprietors of Journal of Dairy Research 1996

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