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The crude protein requirement of the early-weaned calf given urea, meat meal or soya bean meal with and without sulphur supplementation

Published online by Cambridge University Press:  02 September 2010

Jane Leibholz  and
H. S. Kang
Jane Leibholz
Affiliation:
M. C. Franklin Laboratory, University of Sydney Farms, Camden N.S.W. 2570, Australia
H. S. Kang
Affiliation:
M. C. Franklin Laboratory, University of Sydney Farms, Camden N.S.W. 2570, Australia
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Summary

Two experiments were conducted with 84 male British Friesian calves to estimate their nitrogen and sulphur requirements between 5 and 11 weeks of age. A basal 12 % crude protein (CP) diet was supplemented with meat meal, soya bean meal or urea to 15 or 18 % CP, and with sulphur to reduce the nitrogen to sulphur ratios of the diets to about 10 to 1.

The weight gains and feed conversion ratios of the calves given the 12% CP diets were significantly poorer than those of the calves fed on the diets containing 15 or 18% CP, irrespective of the CP supplement used. The supplementation of the urea-containing diets with sulphur caused a significant increase in feed intake and weight gain.

The digestibility of nitrogen and dry matter increased with increasing CP content of the diets and was greater for the diets supplemented with urea than for those supplemented with meat meal or soya bean meal. Sulphur additions also increased the nitrogen digestibility. The retention of nitrogen, when corrected for feed intake, was greater in the calves fed on the diets containing 18% CP than in those fed on the 15% and 12% CP diets.

The supplementation of the diets with sulphur increased the digestibility of sulphur, its excretion in urine and its retention. The concentration of urea in the blood plasma increased with increasing dietary CP content, and was higher in calves given urea.

Type
Research Article
Information
Animal Production , Volume 17 , Issue 3 , December 1973 , pp. 257 - 265
Copyright
Copyright © British Society of Animal Science 1973

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