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Variations in the susceptibility of lactating and non-lactating bovine udders to infection when infused with Escherichia coli

Published online by Cambridge University Press:  01 June 2009

A. J. Bramley
A. J. Bramley
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading, RG2 9AT
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Summary

Small numbers of Escherichia coli were infused into both lactating and non-lactating udders. Twelve of the 17 lactating quarters infused became infected, and all 12 showed clinical symptoms of udder disease. The 5 lactating quarters which did not become infected all had pre-infusion somatic cell counts > 300000 cells/ml milk, whilst all the quarters which became infected had cell counts < 300000 cells/ml milk. E. coli was subsequently recovered from only 6 of the 16 non-lactating quarters infused. In only 2 of these quarters did clinical infection follow, both quarters being in a cow infused 2 d before calving. The remaining 4 quarters from which E. coli was recovered were all negative within 5 d of infusion. These differences in susceptibility are discussed, particularly with reference to the frequent occurrence of coliform mastitis at and shortly after calving.

Type
Research Article
Information
Journal of Dairy Research , Volume 43 , Issue 2 , June 1976 , pp. 205 - 211
Copyright
Copyright © Proprietors of Journal of Dairy Research 1976

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References

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