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Impact force as a possible cause of mechanical transfer of bacteria to the interior of the cow's teat

Published online by Cambridge University Press:  01 June 2009

C. C. Thiel ,
Carol L. Thomas ,
D. R. Westgarth  and
B. Reiter
C. C. Thiel
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading
Carol L. Thomas
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading
D. R. Westgarth
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading
B. Reiter
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading
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Summary

Using bacterial endotoxin as a tracer material, it has been shown that a jet of liquid impinging on the end of the teat for 1 min after milk flow had ceased during machine milking could force material past the barrier of the streak canal. Positive results were obtained when the maximum pressure at the centre of the impact area was about 0·25 bar, with a considerably higher frequency of positives at 0·3–0·5 bar. It seems possible that such impact pressures might occur during milking and cause transfer of infective material to the teat sinus. Impact force could arise when milk returned to the teatcup liner as the result of local or general conditions of instability in the milking machine vacuum.

Type
Original Articles
Information
Journal of Dairy Research , Volume 36 , Issue 2 , June 1969 , pp. 279 - 297
Copyright
Copyright © Proprietors of Journal of Dairy Research 1969

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References

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