Journal of Nutrition

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Journal of Nutrition Vol. 79 No. 2 February 1963, pp. 205-210
Copyright © 1963 by American Society for Nutrition
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Growth and Development of Chick Embryos Supplied with Various Concentrations of Yolk1

Norman E. Walker and C. R. Grau

Department of Poultry Husbandry, University of California, Davis, California

When small amounts of yolk were supplied to chick embryos deprived of their own yolk after three days of incubation, survival, developmental stage, and body weight, measured at 8 or 9 days, were related directly to the amount of yolk provided. Embryos that were sacrificed, or that died of yolk exhaustion, show no characteristic abnormalities except for some edema among those of 11 to 13 days' incubation. Body weights of embryos sacrificed at 8 days were found to have increased as yolk increased to a maximum at 1 ml/embryo; for normal weight at 9 days, 2 ml of yolk were required. Yolk concentration affected allantoic development and the Na/K ratio in the amniotic fluid of 8-day embryos.

1 These studies were supported in part by National Science Foundation grant G-9836.

Manuscript received 7 August 1962.




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