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Stimulation of Streptococcus thermophilus growth in mastitic milk

Published online by Cambridge University Press:  01 June 2009

Valerie M. Marshall  and
A. John Bramley
Valerie M. Marshall
Affiliation:
*National Institute for Research in Dairying (University of Reading), Shinfield, Reading RG2 9AT, UK
A. John Bramley
Affiliation:
*National Institute for Research in Dairying (University of Reading), Shinfield, Reading RG2 9AT, UK
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Summary

Growth of Streptococcus thermophilus was faster in mastitic milk, aseptically collected following intramammary infusion of Escherichia coli endotoxin, than in normal aseptically collected milk. The contribution of polymorphonuclear leucocytes (PMN), of plasma and plasmin to this stimulation has been investigated. Addition of plasmin to low cell count milk stimulated growth of the streptococcus to the same degree as mastitic milk. However, addition of plasma or PMN from blood or from milk were less stimulatory. The part played by these components in providing casein breakdown products for the weakly proteolytic Str. thermophilus in mastitic milk is discussed.

Type
Original Articles
Information
Journal of Dairy Research , Volume 51 , Issue 1 , February 1984 , pp. 17 - 22
Copyright
Copyright © Proprietors of Journal of Dairy Research 1984

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