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Journal of Nutrition Vol. 114 No. 1 January 1984, pp. 132-143
Copyright © 1984 by American Society for Nutrition
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Hormone and Lipogenic Enzyme Response of the Heterozygous dw Chick to Dietary Protein Level1

Pamela A. Stewart and Kenneth W. Washburn

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

The growth and lipogenic responses of broiler progeny from normal (D{omega}D{omega}male, D{omega}-female) and dwarf (D{omega}d{omega}male, D{omega}-*female) dams to high and low dietary protein were studied. Body weight gains for the D{omega}D{omega} compared to D{omega}d{omega} male progeny were greater from week 1 to 3, but less from week 7 to 8 and were similar for D{omega}-* and D{omega}- females. No significant effects of progeny genotype and no diet x genotype interactions were observed for feed conversion, carcass nitrogen or fat, abdominal fat, growth hormone, triiodothyronine (T3) or thyroxine (T4). Hepatic malic enzyme was elevated in D{omega}D{omega} male progeny compared to D{omega}d{omega} males, regardless of diet, and was greater in D{omega}- females than in D{omega}-* only in response to low dietary protein. Citrate cleavage enzyme was greater in D{omega}-* than in D{omega}- females. Low protein resulted in elevated lipogenic enzyme activities, which were more pronounced in progeny of normal dams. A positive relationship observed between malic enzyme activity and T3 levels for all progeny not carrying the dw gene suggests that although circulating levels of thyroid hormones did not differ between genotypes, the cellular response to these hormones was affected by the presence of the d{omega} gene.

KEY WORDS: • dwarfing gene • growth • lipogenic • growth hormone • T3 • T4 • malic enzyme • citrate cleavage enzyme • dietary protein

1 Supported by State and Hatch funds allocated to the Georgia Agricultural Experiment Stations of the University of Georgia.

Manuscript received 10 June 1983.




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