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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

REFERENCES

Adams, E. W. & Rickard, C. G. 1963 The antistreptococcic activity of bovine teat canal keratin. American Journal of Veterinary Research 24 122–135Google Scholar
Bramley, A. J. & Higgs, T. M. 1974 Growth of bacteria through the streak canal of unmilked cows. 19th International Dairy Congress, New Delhi 1E 134Google Scholar
Forbes, D. 1968 The passage of staphylococci through the bovine teat canal. Journal of Dairy Research 35 399–406CrossRefGoogle Scholar
Hibbitt, K. G., Cole, C. B. & Reiter, B. 1969 Antimicrobial proteins isolated from the teat canal of the cow. Journal of General Microbiology 56 365–371Google Scholar
McDonald, J. S. 1970 Microscopic observations of teat canals from susceptible and resistant bovine mammary glands: a preliminary report. 6th International Conference on Cattle Diseases, Philadelphia, PA pp. 97–103 (Ed. McFeeley, R. A., Morse, G. E. and Williams, E. I.). Oklahoma: American Association of Bovine PractitionersGoogle Scholar
Morse, G. E., Hubben, K. & Mitchell, K. F. 1970 The teat canal as a natural barrier to udder infection. 6th International Conference on Cattle Diseases, Philadelphia, PA pp. 108–121 (Ed. McFeeley, R. A., Morse, G. E. and Williams, E. I.). Oklahoma: American Association of Bovine PractitionersGoogle Scholar
Murphy, J. M. 1959 The effect of certain mild stresses to the bovine teat canal on infection with Streptococcuc agalactiae. Cornell Veterinarian 49 411–421Google Scholar
Pounden, W. D. & Grossman, J. D. 1950 Wall structure and closing mechanisms of the bovine teat. American Journal of Veterinary Research 11 349–354Google Scholar
Schultze, W. D. 1981 Assay of penetrability of bovine papillary duct implanted with Escherichia coli endotoxin. American Journal of Veterinary Research 42 1993–1998Google ScholarPubMed
Williams, D. M. 1984 A study of the epithelium of the bovine teat canal. Ph.D. thesis, University of Melbourne.Google Scholar
Williams, D. M. & Mein, G. A. 1980 Effects of pulsation and pulsation failure on the bovine teat canal. In Proceedings of the International Workshop on Machine Milking and Mastitis pp. 73–81 (Ed. O'Shea, J.) Moorepark, Fermoy, Co. Cork, Irish Republic: An Foras TalúntaisGoogle Scholar