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A note on the need for supplementary nitrogen in diets for fattening beef cattle

Published online by Cambridge University Press:  02 September 2010

M. Kay  and
A. Macdearmid
M. Kay
Affiliation:
The Rowett Research Institute, Bucksburn, Aberdeen, AB2 9SB
A. Macdearmid
Affiliation:
The Rowett Research Institute, Bucksburn, Aberdeen, AB2 9SB
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Summary

Thirty British Friesian steers were given either a pelleted diet of bruised barley and ground barley straw (70:30) containing 9·4% crude protein (N × 6·25) or a similar diet with urea or soya bean meal added to raise the crude protein content to 15·0%. Up to a live weight of 200 kg, the growth rate and feed conversion of steers were improved by supplementary nitrogen and urea provided this as effectively as soya bean meal. Beyond 200 kg there were no differences in growth rate or feed conversion between any of the experimental treatments.

Type
Research Article
Information
Animal Production , Volume 14 , Issue 3 , June 1972 , pp. 367 - 369
Copyright
Copyright © British Society of Animal Science 1972

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References

Agricultural Research Council. 1965. The Nutrient Requirements of Farm Livestock. No. 2, Ruminants. Agricultural Research Council, London.Google Scholar