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1968. Activity, concentration, and lumen-blood electrochemical potential difference of calcium in the intestine of the laying hen. J. Nutrition, 95: 647-654. Hurwitz, S., and S. Bornstein, 1966. The effect of high dietary calcium on the performance of laying hens fed rations of varying energy levels. Poultry Sci. 45: 805-809. Morris, B. A., and T. G. Taylor, 1968. The daily food consumption of laying hens in relation to egg formation. Brit. Poultry Sci. 8: 251-257. Mueller, W. J., R. Schraer and H. Schraer, 1964. Calcium metabolism and skeletal dynamics of laying pullets. J. Nutrition, 84: 20-26.

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