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Journal of Nutrition Vol. 113 No. 10 October 1983, pp. 2078-2084
Copyright © 1983 by American Society for Nutrition
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Temporal Effect of Change in Diet Composition on Plasma Estradiol and Thyroxine Concentrations and Hepatic Lipogenesis in Laying Hens1

Yukio Akiba2 and Leo S. Jensen3

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

Temporal effects of feeding isocaloric and isonitrogenous diets with and without 10% menhaden fish meal (FM) on plasma estradiol and thyroxine concentrations, hepatic fatty acid synthetase activity and lipid content were significantly increased Hepatic fatty acid synthetase activity and lipid content were significantly increased at 7 days and 14 days, respectively, after feeding the corn-soybean meal (CS) diet. Plasma thyroxine concentration was significantly reduced at 3 days after feeding the FM diet. Plasma estradiol concentration was immediately and gradually elevated after feeding the CS diet and reduced after changing from the CS to the FM diet. A significant positive correlation was observed between plasma estradiol, but not plasma thyroxine, and hepatic fatty acid synthetase activity. These findings suggest that tissue estradiol concentration responds early to dietary changes followed by stimulated hepatic lipogenesis, and steatosis in laying hens.

KEY WORDS: • estradiol • fatty acid synthetase • fatty liver • fish meal • temporal effect

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

2 Current address is Department of Animal Science. Faculty of Agriculture, Tohoku University, Sendai 980, Japan.

3 To whom reprint requests should be sent.

Manuscript received 21 April 1983.




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