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The utilization of the metabolizable energy of diets of different protein content by the milk-fed lamb

Published online by Cambridge University Press:  27 March 2009

D. M. Walker  and
B. W. Norton
D. M. Walker
Affiliation:
Department of Animal Husbandry, University of Sydney, Sydney, NSW 2006, Australia
B. W. Norton
Affiliation:
Department of Animal Husbandry, University of Sydney, Sydney, NSW 2006, Australia
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Summary

Nineteen male cross-bred lambs, aged between 2 and 5 days, were allotted to each of three dietary treatments for an experimental period of 3 weeks. The protein contents of the diets (on a dry-matter basis) were 12·0% (diet A), 28·5% (diet B) and 45·5% (diet C). The diets were fed as artificial milks that contained 15% total solids, and the energy intakes of groups of lambs within each dietary treatment varied from below maintenance to ad lib.

Metabolizable energy (ME) as a percentage of the gross energy was constant for all diets, at all levels of energy intake, at 94·3 ± 0·3%. ME intake was linearly related to energy retention above maintenance with all diets. There was a significant linear decrease in the net efficiency of ME utilization as the protein content of the diet increased. However, the individual regressions did not differ significantly from the common regression coefficient of 0·686 ± 0·018, i.e. a net efficiency of 68·6 ± 1·8%. The individual coefficients were 0·740, 0·679 and 0·634 for diets A, B and C respectively.

The ME requirement for energy equilibrium (maintenance) of lambs given diet B (100·4± 11·7 kcal/kg0·73 day) was significantly lower than that of lambs given diet A (126·4 ± 14·3) or diet C (119·2 ± 15·6). The energy costs of fat and protein deposition, calculated by multiple regression analysis of the pooled data, were 11·1 kcal ME per g fat and 8·5 kcal ME per g protein respectively.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 77 , Issue 3 , December 1971 , pp. 363 - 369
Copyright
Copyright © Cambridge University Press 1971

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References

REFERENCES

Blaxter, K. L. (1962). The Energy Metabolism of Ruminants. London: Hutohinson.Google Scholar
Close, W. H. & Mount, L. E. (1971). Energy retention in the pig at several environmental temperatures and levels of feeding. Proc. Nutr. Soc. 30, 33–4A.Google Scholar
Jagusch, K. T., Norton, B. W. & Walker, D. M. (1970). Body composition studies with the milk-fed lamb. I. Chemical composition and calorific content of the body and organs of newly-born lambs. J. agric. Sci., Camb. 75, 273–7.CrossRefGoogle Scholar
Kielanowski, J. (1965). Energy Metabolism (ed. Blaster, K. L.), p. 13. London: Academic Press. (Proc. 3rd Symp. Energy Metab., Troon.) (EAAP Publ. No. 11.)Google Scholar
Kielanowski, J. & Kotarbińska, M. (1970). Energy Metabolism of Farm Animals (ed. Schürch, A. & Wenk, C.), p. 145. Zurich: Juris-Verlag. (Proc. 5th Symp. Energy Metab., Vitznau.) (EAAP Publ. No. 13.)Google Scholar
Kielanowski, J. & Lassota, L. (1960). Bilans przemiany energii u jagniat. Zesz. probl. Postep Nauk roln. 22, 173–5.Google Scholar
Kotarbińska, M. & Kielanowski, J. (1969). Energy Metabolism of Farm Animals (ed. Blaxter, K. L., Kielanowski, J. & Thorbek, G.), p. 299. Newcastle upon Tyne: Oriel Press Ltd. (Proc. 4th Symp. Energy Metab., Jablonna.) (EAAP Publ. No. 12.)Google Scholar
Ørskov, E. R. & McDonald, I. (1970). Energy Metabolism of Farm Animals (ed. Schürch, A. & Wenk, C.), p. 121. Zurich: Juris-Verlag. (Proc. 5th Symp. Energy Metab., Vitznau.) (EAAP Publ. No. 13.)Google Scholar
Oslage, H. J., Gädeken, D. & Fliegel, H. (1970). Energy Metabolism of Farm Animals (ed. Schürch, A. & Wenk, C.), p. 133. Zurich: Juris-Verlag. (Proc. 5th Symp. Energy Metab., Vitznau.) (EAAP Publ. No. 13.)Google Scholar
Schiemann, R. (1963). Die energetische Verwertung des Proteins. Deutsche AJcademie der Landw., Sitzungsberichte, Vol. XII, 4·3, 39–58.Google Scholar
Schiemann, R., Chudy, A. & Herceg, O. (1969). Der Energieaufwand für die Bildung von Körperprotein beim Wachstum nach Modellversuchen an Ratten. 1. Versuche mit Vollei als Nahrungsprotein. Arch. Tierernähr. 19, 395–407.CrossRefGoogle Scholar
Thorbek, G. (1970). Energy Metabolism of Farm Animals (ed. Schürch, A. & Wenk, C.), p. 129. Zurich: Juris-Verlag. (Proc. 5th Symp. Energy Metab., Vitznau.) (EAAP Publ. No. 13.)Google Scholar
Walker, D. M. & Jagusch, K. T. (1969). Energy Metabolism of Farm Animals (ed. Blaxter, K. L., Kielanowski, J. & Thorbek, G.), p. 187. Newcastle upon Tyne: Oriel Press Ltd. (Proc. 4th Symp. Energy Metab., Jablonna.) (EAAP Publ. No. 12.)Google Scholar
Walker, D. M. & Norton, B. W. (1970). Energy Metabolism of Farm Animals (ed. Schürch, A. & Wenk, C.), p. 125. Zurich: Juris-Verlag. (Proc. 5th Symp. Energy Metab., Vitznau.) (EAAP Publ. No. 13.)Google Scholar
Walker, D. M. & Norton, B. W. (1971). Nitrogen balance studies with the milk-fed lamb. 9. Energy and protein requirements for maintenance, liveweight gain and wool growth. Br. J. Nutr. 26, 15–29.Google Scholar