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A note on the influence of stage of lactation on the response in the lactose content of milk to a change of plane of energy nutrition in the cow

Published online by Cambridge University Press:  01 June 2009

R. R. Dawson  and
J. A. F. Rook
R. R. Dawson
Affiliation:
Department of Agricultural Sciences, The University of Leeds, Leeds LS2 9JT
J. A. F. Rook
Affiliation:
Department of Agricultural Sciences, The University of Leeds, Leeds LS2 9JT
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Summary

Three groups of Friesian cows, one of cows in early lactation, one of cows in mid-lactation and one of cows in late lactation, received over successive 4-week periods according to a double changeover Latin square design, rations providing a low, a normal and a high plane of energy nutrition. With the group of cows in early lactation the treatments were repeated again in mid-lactation and in late lactation.

In all experimental groups there were increases and decreases in the treatment mean values for milk yield and solids-not-fat, protein and lactose contents, in response respectively to overfeeding and to underfeeding. The responses in lactose content in early and mid-lactation were small (overfeeding, 0·00 to +0·06 percentage units; underfeeding, −0·01 to −0·08 percentage units) and less than those in protein content, whereas in late lactation they were larger (overfeeding, +0·09 to +0·14 percentage units; underfeeding, −0·13 to −0·19 percentage units) and of the similar size to those in protein content.

Type
Research Article
Information
Journal of Dairy Research , Volume 39 , Issue 1 , February 1972 , pp. 107 - 111
Copyright
Copyright © Proprietors of Journal of Dairy Research 1972

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References

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