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Journal of Nutrition Vol. 62 No. 3 July 1957, pp. 325-339
Copyright © 1957 by American Society for Nutrition
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The Physiological Behavior of Calcium in the Rat1,2,3,

Sam L. Hansard4 and H. M. Crowder

University of Tennessee — Atomic Energy Commission Agricultural Research Program, Oak Ridge, Tennessee

The excretion, absorption and movement in the body of calcium as a function of age has been studied in 141 individual rats. Consideration was given to the use of radiocalcium data for the interpretation of the physiological behavior of the stable calcium normally present in the animal body, and the fundamental importance of balance data in radioisotope investigations was emphasized. Calcium absorption, retention and excretion rate were greatest in young animals, decreased rapidly to the age of sexual maturity and more slowly to maturity and old age. Daily endogenous fecal calcium losses and the requirements for maintenance increased slightly to maturity and markedly in the aged animal. Tissue calcium-45 concentration data, corrected for body weight and absorption differences due to age indicated that tissue deposition reflected the physiological status of the animal and its ability to handle the current calcium supply. The significance of fecal calcium partition, the estimation of endogenous calcium, true digestibility, maintenance requirements and the interpretation of radiocalcium data in terms of the behavior of stable calcium in the animal body are discussed.

1 This manuscript is published with the approval of the Director of the Tennessee Agricultural Experiment Station, Knoxville, Tennessee.

2 The radioactive isotopes used in these studies were obtained from the Oak Ridge National Laboratory on allocation from the U. S. Atomic Energy Commission.

3 This work was completed under contract no. AT-40-1-GEN-242 between the University of Tennessee, College of Agriculture and the Atomic Energy Commission.

4 Present address: Department of Animal Industry, Louisiana State University, Baton Rouge, Louisiana.

Manuscript received 24 January 1957.




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