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The nutritional value of poor proteins fed at high levels

2.* Species differences

Published online by Cambridge University Press:  09 March 2007

K. Anantharaman ,
K. J. Carpenter  and
M. C. Nesheim
K. Anantharaman
Affiliation:
School of Agriculture, University of Cambridge
K. J. Carpenter
Affiliation:
School of Agriculture, University of Cambridge
M. C. Nesheim
Affiliation:
Department of Poultry Science, Cornell University, USA
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Abstract

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1. The same six high-protein diets that were fed to rats (Carpenter & Anantharaman, 1968) have now been fed to chicks.

2. The net nitrogen retention by chicks, per 100 kcal consumed, was for each diet greater by 20–50% than the retention by rats. For a diet based on a mixture of commercial protein concentrates the NDpCal % was 19·1 (± 0·18); this value greatly exceeded the theoretical maximum of 14·6 obtained from the equations of Miller & Payne (1963).

3. Although groundnut protein plus lysine has a calculated chemical score of only 56, chicks receiving this at a high level retained N at the same rate (NDpCal % of 17·5–17·9) as those receiving a diet which included egg protein at the level (26% of the dietary ME) predicted to be optimal for them.

4. The ‘endogenous + metabolic’ losses of N were in almost the same proportion to metabolic size for chicks as for rats.

Type
Research Article
Information
British Journal of Nutrition , Volume 22 , Issue 2 , May 1968 , pp. 199 - 205
Copyright
Copyright © The Nutrition Society 1968

References

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