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Intensive beef production 4. The effect on nitrogen retention of all-concentrate diets containing different levels of fish meal

Published online by Cambridge University Press:  02 September 2010

H. B. Bowers ,
T. R. Preston ,
I. McDonald ,
N. A. MacLeod  and
Euphemia B. Philip
H. B. Bowers
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen
T. R. Preston
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen
I. McDonald
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen
N. A. MacLeod
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen
Euphemia B. Philip
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen
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Summary

1. All-concentrate diets given ad libitum and containing different levels of fish meal, and varying in crude protein content from 16 to 22% in dry matter were given to eight Friesian steers at 150 kg. and at 240 kg. live-weight.

2. At a mean live-weight of 150 kg., the retention of nitrogen increased significantly to a maximum of 41.5 g. per day on the diet having 22% crude protein in dry matter. At 240 kg. live-weight, the maximum retention of 37 g. per day was achieved at 20% crude protein in dry matter.

3. Faecal nitrogen excretion per unit of metabolic body weight was approximately constant at all protein levels and at both live-weights.

4. Urinary nitrogen excretion per unit of metabolic body weight increased with increasing crude protein level in the diet and for any crude protein level was higher at 240 kg. than at 150 kg. live-weight.

Type
Research Article
Information
Animal Production , Volume 7 , Issue 1 , January 1965 , pp. 19 - 25
Copyright
Copyright © British Society of Animal Science 1965

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References

REFERENCES

Preston, T. R., Whitelaw, F. G., Aitken, J. N., Macdearmid, A., & Charleson, E. B., 1963. Intensive beef production. 1. Performance of cattle given complete ground diets. Anim. Prod., 5: 47.Google Scholar
Whitelaw, F. G., & Preston, T. R., 1963. The nutrition of the early-weaned calf. III. Protein solubility and amino acid composition as factors affecting protein utilisation. Anim. Prod., 5: 131.Google Scholar
Whitelaw, F. G., Preston, T. R., & Dawson, G. S., 1961. The nutrition of the early-weaned calf. II. A comparison of commercial groundnut meal, heat-treated groundnut meal and fish meal as the major protein source in the diet. Anim. Prod., 3: 127.Google Scholar
Whitelaw, F. G., Preston, T. R., & Macleod, N. A., 1964. The nutrition of the early-weaned calf. VII. The relative value of four different fish meal products as the major protein source in the diet. Anim. Prod., 6: 25.Google Scholar