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A study of growth in calves:III. Energy and nitrogen efficiencies of growth of carcass tissues

Published online by Cambridge University Press:  27 March 2009

W. J. Pryor  and
E. R. Johnson
W. J. Pryor
Affiliation:
Department of Animal Husbandry, University of Queensland
E. R. Johnson
Affiliation:
Department of Veterinary Anatomy, University of Queensland
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Summary

The gross energy and nitrogen contents of muscle, fat, and connective tissue of calves were determined, and from these data and feed analyses the gross energetic (GEE) and nitrogen efficiency (GNE) of growth, and the gross efficiencies of accretion since birth (GEA, GNA) were calculated.

The percentage range of actual efficiency values for calves were GEE 55·3–7·7, GEA 18·1–1·4, GNE 58·1–22·8, and GNA 28·1–7·3. Within each treatment group these values were higher in the heavier calves. An hypothesis for the apparent temporary rise in these values in the heavier calves is that a compensatory mechanism acts in calves on low energy and possibly low N intake to enable them better to utilize their food. The results were obtained in calves whose diet was comprised of a reconstituted milk of low-solid content which led to low growth rates.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 76 , Issue 3 , June 1971 , pp. 459 - 463
Copyright
Copyright © Cambridge University Press 1971

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References

REFERENCES

Association of Official Agricultural Chemists (1965). Official Methods of Analysis, 10th ed.Washington, D.C.: A.O.A.C.Google Scholar
Blaxter, K. L. (1962). The Energy Metabolism of Ruminants. London: Hutchinson.Google Scholar
Blaxter, K. L. (1967). Nutritional problems arising in intensive animal production—energy aspects. Proc. 2nd World Conf. Anim. Prod., paper no. 9, p. 73.Google Scholar
Blaxter, K. L. & Rook, J. A. F. (1953). The heat of combustion of the tissues of cattle in relation to their chemical composition. Br. J. Nutr. 7, 83.CrossRefGoogle ScholarPubMed
Blaxter, K. L. & Wood, W. A. (1951). The nutrition of the young Ayrshire calf—the endogenous nitrogen and basal energy metabolism of the calf. Br. J. Nutr. 5, 11.CrossRefGoogle Scholar
Brody, S. (1945). Bioenergetics and Growth. New York: Hafner.Google Scholar
Butterfield, R. M., Johnson, E. R. & Pryor, W. J. (1971). A study of growth in calves. I. Carcass tissues. J. agric. Sci., Camb. 76, 453.CrossRefGoogle Scholar
Butterfield, R. M. & Johnson, E. R. (1971). A study of growth in calves. II. Relative growth of muscles. J. agric. Sci., Camb. 76, 457.CrossRefGoogle Scholar
Gaines, W. L. & Davidson, F. A. (1923). The relation between percentage fat content and yield of milk. Bull. Ill. agric. Exp. Stn, no. 245.Google Scholar
Morris, J. G. & Moir, K. W. (1963). Methods of determining the chemical composition of dead animals. Aust. Agric. Council and Anim. Prod. Committee Handbook, paper no. 2.Google Scholar
Pryor, W. J. & Butterfield, R. M. (1967). Gross energetic efficiency of the edible carcase tissue growth of calves. Aust. vet. J. 43, 145.CrossRefGoogle ScholarPubMed
Raymond, W. F., Harris, C. E. & Kemp, C. D. (1955). Studies in the digestibility of herbage—the effect of level of herbage intake on the digestibility of herbage by sheep. J. Br. Grassld Soc. 10, 19.CrossRefGoogle Scholar
Roy, J. H. B., Gaston, Helen J., Shillan, K. W. G., Thompson, S. Y. & Stobo, I. J. F. (1964). The nutrition of the veal calf—the effect of anaemia and of iron and chlortetracycline supplementation on the performance of calves given large quantities of whole milk. Br. J. Nutr. 18, 467.CrossRefGoogle Scholar
Watson, D. M. S. (1943). Beef cattle in peace and war. Emp. J. exp. Agric. 11, 191.Google Scholar