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Effect of reaming the papillary duct of cows' teats on keratin removal and penetrability of the duct to implanted Escherichia coli endotoxin

Published online by Cambridge University Press:  01 June 2009

W. Donald Schultze  and
A. John Bramley
W. Donald Schultze
Affiliation:
Milk Secretion and Mastitis Laboratory, SEA, US Department of Agriculture, Beltsville, MD 20705USA
A. John Bramley
Affiliation:
†National Institute for Research in Dairying (University of Reading), Shinfield, Reading RG2 9AT, UK
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Summary

Penetrability of the bovine teat duct to Escherichia coli endotoxin solution was measured before and after reaming the duct with a polypropylene tube, a steel twist drill bit, or a fluted drill point. There was some evidence of a transient increase in penetrability for one or two milkings following reaming but most ducts were not rendered penetrable to endotoxin. Histological examination of ducts after reaming showed that although the loosely packed superficial keratin was effectively removed a continuous smooth keratin layer remained covering the epithelium. These observations are discussed with respect to the possible mechanisms responsible for maintaining the defensive barrier of the duct to bacterial penetration.

Type
Original Articles
Information
Journal of Dairy Research , Volume 52 , Issue 3 , August 1985 , pp. 361 - 368
Copyright
Copyright © Proprietors of Journal of Dairy Research 1985

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References

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