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An assessment of barley straw and oat hulls as energy sources for yearling cattle

Published online by Cambridge University Press:  27 March 2009

T. Smith ,
W. H. Broster  and
J. W. Siviter
T. Smith
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading, RO2 9 AT
W. H. Broster
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading, RO2 9 AT
J. W. Siviter
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading, RO2 9 AT
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Summary

Three experiments, each consisting of a feeding trial plus a digestibility and nitrogen retention study, compared long barley straw with rolled barley as basal diets and oat hulls with maize starch as energy supplements for yearling dairy cattle. The protein ontent of the diets was varied by the addition of flshmeal.

Growth rates were reduced by the dietary combination of high fibre and low protein, so that diets rich in straw, or containing a supplement of oat hulls, gave a large response to a supplement of fishmeal compared with low straw or maize starch supplemented diets. The data suggest a crude protein concentration of 115 g/kg dry matter as a requirement for high fibre diets supplemented with fishmeal, when fed to yearling cattle. Retention of nitrogen reflected the pattern of live-weight gain. Molar proportions of VFA were affected by changes in the roughage: concentrates ratio, except where energy and protein intakes were both low.

Barley straw was of a higher nutritive value than oat hulls.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 95 , Issue 3 , December 1980 , pp. 677 - 686
Copyright
Copyright © Cambridge University Press 1980

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