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Journal of Nutrition Vol. 64 No. 2 February 1958, pp. 303-312
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Adaptation to Different Calcium Intakes in Dogs1

Stanley N. Gershoff, M. A. Legg and D. M. Hegsted

Department of Nutrition, Harvard School of Public Health, The Mallory Institute of Pathology, Boston City Hospital and the Department of Biochemistry, Harvard Medical School, Boston, Mass.

Three groups of two dogs each were reared and maintained on diets containing different levels of calcium. Balance studies showed that during the active growth period, those upon the low-calcium diet (0.114%) retained calcium much more efficiently than those fed higher levels.

Repeated balance studies at different levels of calcium intake after the animals were 9 to 36 months of age demonstrated that the amount of calcium needed to maintain balance is largely a reflection of the previous calcium intake. The dogs "adapted" to a low-calcium diet had a calcium requirement for balance so low it could not be measured with accuracy and were not in consistent negative balance upon diets containing 0.034% of calcium.

Chemical and histological examination of the bones failed to reveal differences in composition or abnormalities attributable to calcium deficiency.

1 Supported in part by grants-in-aid from the National Institute of Arthritis and Metabolic Diseases (no. A-194), National Institutes of Health, Public Health Service, Bethesda, Md.; the Nutrition Foundation, Inc., New York, N. Y.; and the Fund for Research and Teaching, Department of Nutrition, Harvard School of Public Health, Boston, Mass.

Manuscript received 27 August 1957.




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