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Composition of body-weight change during lactation in Hereford × British Friesian cows

Published online by Cambridge University Press:  27 March 2009

T. E. Trigg  and
J. H. Topps
T. E. Trigg
Affiliation:
Division of Agricultural Chemistry and Biochemistry, University of Aberdeen, 581 King Street, Aberdeen AB9 1 UD
J. H. Topps
Affiliation:
Division of Agricultural Chemistry and Biochemistry, University of Aberdeen, 581 King Street, Aberdeen AB9 1 UD
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Summary

Measurements were made of changes in body water, estimated by the dilution of deuterium oxide, in six Hereford x British Friesian lactating cows in their second lactation and in four of the same animals in their third lactation. The animals were subjected to a prolonged period of underfeeding followed by a period of realimentation. Milk yields were measured twice daily whilst measurement of live weight and certain blood constituents were made at 7-day intervals during the experimental periods in both years. During underfeeding milk yield differed markedly among the cows and it appeared that the cows with a higher milk potential maintained a higher yield but in doing so they incurred a greater loss of body weight. On refeeding there was little or no response in milk yield. Weight losses during the second lactation consisted mainly of body fat (calculated by difference) but the four higher yielding cows lost appreciable amounts of body water and probably significant amounts of body protein. In the third lactation all four cows lost less body fat but more body water and probably body protein than they did in the second lactation. On refeeding all animals in both years except the two lowest yielders in the second lactation gained substantial amounts of body water and probably protein but relatively little or no body fat. Significant negative and positive correlations were obtained between plasma glucose and loss of body water and between plasma free fatty acids and loss of body fat respectively.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 97 , Issue 1 , August 1981 , pp. 147 - 157
Copyright
Copyright © Cambridge University Press 1981

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