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Experiments on the nutrition of the dairy heifer. XI. Further observations on the effect of energy intake on protein utilization

Published online by Cambridge University Press:  27 March 2009

W. H. Broster ,
T. Smith ,
J. W. Siviter ,
E. Schuller  and
Valerie J. Broster
W. H. Broster
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading RG2 9AT, England
T. Smith
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading RG2 9AT, England
J. W. Siviter
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading RG2 9AT, England
E. Schuller
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading RG2 9AT, England
Valerie J. Broster
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading RG2 9AT, England
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Summary

Five experiments were made to observe the effect on nitrogen (N) utilization by young cattle of supplements of sucrose, glucose monohydrate (dextrose), and maize starch when added to basal diets of concentrates and straw. The supplements provided about 12% of the total intake of air-dry food. Twenty-four yearling Friesian heifers were used in each of two randomized block experiments to measure live-weight gain, and 6, 10 and 10 yearling Friesian steers in three changeover design experiments to measure N retention.

Rates of live-weight gain and N retention were increased by all the supplements amongst which no order of superiority in benefit conferred could be established. The improvement in N retention was associated with a marked reduction in urinary N and a small increase in faecal N with supplemented rations.

The proportions of volatile fatty acids (VFA) in rumen fluid were not affected by starch supplementation. Both sugars, but glucose more than sucrose, decreased the ratio of acetic to propionic acid, measured 2 h after feeding.

Statistically significant multiple linear regression equations were observed between N retained and intakes of N and digestible organic matter (DOM), both as absolute amounts with live weight as a further independent variate, and as intakes/unit metabolic body size. N2 and DOM × N as additional variates did not benefit the fit of the equations over the range of intakes studied.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 91 , Issue 2 , October 1978 , pp. 399 - 413
Copyright
Copyright © Cambridge University Press 1978

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