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Physical characteristics of the bovine teat canal and their influence on susceptibility to streptococcal infection

Published online by Cambridge University Press:  01 June 2009

S. Jane Lacy-Hulbert  and
J. Eric Hillerton
S. Jane Lacy-Hulbert
Affiliation:
Institute for Animal Health, Compton Laboratory, Compton, Newbury RG16 0NN, UK
J. Eric Hillerton
Affiliation:
Institute for Animal Health, Compton Laboratory, Compton, Newbury RG16 0NN, UK
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Summary

Physical characteristics of the bovine teat canal were examined for their influence on susceptibility to intramammary infection. All quarters of 18 cows were inoculated with 2 × 105 cfu Streptococcus agalactiae (Trial 1) and 20 cows with 105 cfu Str. Uberis (Trial 2) 3–4 mm into the teat canal every 3 d for 12 d. Incidence of quarter infection was similar for both pathogens, 30/72 (42%) in Trial 1 and 32/80 (40%) in Trial 2. Logistic regression analysis showed that probability of infection by Str. Agalactiae increased significantly with an increase in quarter peak flow rate (P < 0·05) whereas probability of infection increased for Str. Uberis with a decrease in teat canal length (P < 0·05). A significantly higher (P < 0·001) incidence of infection by Str. Uberis was observed in quarters that contained a low wet weight (< 1·8 mg) of removable keratin compared with those that contained > 1·8 mg keratin, but there was no correlation between weight of keratin and length of the teat canal. Infections by Str. Uberis took significantly less (P < 0·05) time to show a rise in somatic cell count above 7·5 × 105 cells/ml than Str. agalactiae. The results provide evidence that these pathogens use different mechanisms to pass through the teat canal.

Type
Original Articles
Information
Journal of Dairy Research , Volume 62 , Issue 3 , August 1995 , pp. 395 - 404
Copyright
Copyright © Proprietors of Journal of Dairy Research 1995

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