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Journal of Nutrition Vol. 84 No. 1 September 1964, pp. 58-64
Copyright © 1964 by American Society for Nutrition
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Calcium, Strontium and Phosphorus Utilization by Chicks as Influenced by Nutritional and Endocrine Variations1

Paul E. Waibel and Frank R. Mraz

Agricultural Research Laboratory of the University of Tennessee, Oak Ridge, Tennessee2, and Department of Poultry Science, University of Minnesota, St. Paul, Minnesota

The effects of vitamin D, various energy sources, and hormone treatments on tibia deposition of orally and intramuscularly administered Ca45, Sr89, and P32, on serum calcium, phosphorus, and alkaline phosphatase, and on growth and calcification were investigated, using chicks. Vitamin D at 550 ICU/kg diet resulted in increased calcium and strontium absorption and phosphorus retention when compared with suboptimal vitamin D levels. A tenfold increase in vitamin D to 5500 ICU/kg decreased Ca and Sr absorption and phosphorus retention. Cortisol decreased absorption of calcium and retention of strontium at all vitamin D levels. Estrogen reduced serum phosphorus and retention of calcium, strontium, and phosphorus. Lactose at 20% of the diet increased bone ash. Stearic acid at 10% decreased weight gains, bone ash, calcium absorption, and phosphorus retention.

1 This manuscript is published with the permission of the Directors of the University of Tennessee and University of Minnesota Agricultural Experiment Stations, Knoxville and St. Paul, respectively. Studies accomplished during leave of senior author from University of Minnesota.

2 Operated by the Tennessee Agricultural Experiment Station for the U. S. Atomic Energy Commission under Contract no. AT-40-1-GEN-242.

Manuscript received 3 April 1964.




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