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A comparison of sources of supplementary nitrogen for young cattle receiving fibre-rich diets

Published online by Cambridge University Press:  27 March 2009

T. Smith ,
Valerie J. Broster  and
R. E. Hill
T. Smith
Affiliation:
National Institute for Research in Dairying, Shinfteld, Reading, Berks.
Valerie J. Broster
Affiliation:
National Institute for Research in Dairying, Shinfteld, Reading, Berks.
R. E. Hill
Affiliation:
National Institute for Research in Dairying, Shinfteld, Reading, Berks.
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Summary

Fishmeal, soya-bean meal and urea were compared as nitrogen sources in diets rich in fibre for yearling cattle, using feeding trials and digestibility and nitrogen retention studies. All animals were individually fed. Diets supplemented with fishmeal supported the highest rates of daily live-weight gain and nitrogen retention. There was no response in dry-matter intake and digestibility from extra nitrogen, either from fishmeal or urea, when the crude protein of the diet was 8·5% or over, and a small response in digestibility when soya-bean meal was used.

Molar proportions of VFA, rumen NH3-N concentrations and blood urea nitrogen concentrations were all affected by both amount and source of nitrogen supplementation. Multiple regression analysis showed the undegradable protein supply to be more critical with high than with low fibre diets.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 95 , Issue 3 , December 1980 , pp. 687 - 695
Copyright
Copyright © Cambridge University Press 1980

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