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The effect of bacterial infections of the udder on the yield and composition of cow's milk

Published online by Cambridge University Press:  01 June 2009

J. V. Wheelock ,
J. A. F. Rook ,
F. K. Neave  and
F. H. Dodd
J. V. Wheelock
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading
J. A. F. Rook
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading
F. K. Neave
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading
F. H. Dodd
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading
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Summary

The effect of bacterial infections, produced by infusions of Streptococcus dysgalactiae and of Staphylococcus pyogenes into one quarter of the udder, on milk yield and composition in heifers has been investigated. After a quarter became infected there was invariably a decrease in the yield of milk and in the concentrations of lactose and potassium, while there was an increase in those of sodium, chloride and non-casein proteins. These effects persisted into the 2nd lactation if the infection was not eliminated. If the infection was eliminated during the 1st lactation or during the dry period before 2nd calving there was a complete recovery in the composition of the milk in the 2nd lactation, but the recovery in milk yield was not complete.

Type
Original Articles
Information
Journal of Dairy Research , Volume 33 , Issue 2 , June 1966 , pp. 199 - 215
Copyright
Copyright © Proprietors of Journal of Dairy Research 1966

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References

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