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Possible labile inhibition of the growth of Streptococcus uberis in milk from cows free from mastitis

Published online by Cambridge University Press:  02 October 2002

KIRSTY E. KLIEM  and
J. ERIC HILLERTON
KIRSTY E. KLIEM
Affiliation:
Institute for Animal Health, Newbury, Berkshire, RG20 7NN, UK
J. ERIC HILLERTON
Affiliation:
Institute for Animal Health, Newbury, Berkshire, RG20 7NN, UK
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Abstract

Milk from dairy cows never known to have had an intramammary infection with Streptococcus uberis can inhibit growth of Str. uberis for up to 7 h. This inhibition is abolished if milk is heated to 80 °C. Inhibition appears not to be related to immune defences as it occurs in skimmed milk (cell free), is unrelated to the concentration of immunoglobulin and survives heating to 56 °C. The effect is partly overcome by addition of selected amino acids and vitamins. It is suggested that the inhibition is caused by a restriction in the supply of essential nutrients part of which may require the conversion of plasminogen to plasmin.

Keywords

Streptococcus uberismilkmastitiscow
Type
Research Article
Information
Journal of Dairy Research , Volume 69 , Issue 3 , August 2002 , pp. 375 - 382
Copyright
Proprietors of Journal of Dairy Research 2002

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