Journal of Nutrition

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Journal of Nutrition Vol. 105 No. 6 June 1975, pp. 726-732
Copyright © 1975 by American Society for Nutrition
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Influence of Genetic Differences in Feed Efficiency of Young Chickens on Derivation of Metabolizable Energy from the Diet and Nitrogen Retention

K. W. Washburn, R. A. Guill and H. M. Edwards, Jr.

Department of Poultry Science, University of Georgia, Athens, Georgia 30602

The relationship of efficiency of feed utilization with metbolizable energy derived from the diet and nitrogen retention was studied in broiler strains and in lines selected for divergence in feed conversion ratio. Individual feed conversion (g feed/g gain) and metabolizable energy derived from the diet and nitrogen retention (determined by chromic oxide method) of these strains and lines were measured, and correlations were determined at various intervals from 4 to 9 weeks of age to determine the effects of age, sex, strain, feed conversion, growth, and feed consumption on the metabolizable energy derived from the diet and nitrogen retained. Although there were significant differences in feed conversion between sexes, strains, and lines selected for divergence in feed conversion, there were no associated differences in metabolizable energy derived from the diet or in nitrogen retention. There were no significant correlations of consumption, growth, or feed conversion with metabolizable energy derived from the diet or nitrogen retention. Nitrogen retention of the White Plymouth Rock strain was significantly higher for all ages. These results show that differences observed in growth, consumption, or feed conversion do not influence derivation of metabolizable energy from the diet or nitrogen retention.

KEY WORDS: • feed efficiency • metabolizable energy • nitrogen retention • chicken

Manuscript received 7 October 1974.




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