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The effect of dietary calcium intake in weanling rats on the efficiency of calcium absorption

Published online by Cambridge University Press:  09 March 2007

Susan J. Fairweather-Tait ,
Amanda Johnson  and
A. J. A. Wright
Susan J. Fairweather-Tait
Affiliation:
AFRC Institute of Food Research, Norwich Research Park, Colney, Norwich NR4 7UA
Amanda Johnson
Affiliation:
AFRC Institute of Food Research, Norwich Research Park, Colney, Norwich NR4 7UA
A. J. A. Wright
Affiliation:
AFRC Institute of Food Research, Norwich Research Park, Colney, Norwich NR4 7UA
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Abstract

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Rats were weaned onto high (HCa, 14.6 g/kg)- or low (LCa, 3.88 g/kg)-Ca diets for 12 d and the efficiency of absorption of Ca measured from 20 mg Ca (as CaCl2, labelled with 47Ca) by means of wholebody counting. The LCa group absorbed 74 % of the test dose and the HCa group 60 % of the test dose (P < 0.001). All animals were then given the LCa diet for 6 weeks and the absorption test repeated. This time there was no difference in efficiency of absorption (HCa 54%, LCa 57%). The femur dry weight was significantly lower in the group initially fed on the LCa diet, but the Ca concentration was similar to that of the HCa group. The results do not lend support to the suggestion that early dietary exposure to Ca manifests itself as a difference in Ca metabolism in later life. They do, however, highlight the importance of adequate Ca intake during critical periods of growth.

Keywords

CalciumAbsorption efficiency
Type
Efficiency of Calcium Absorption
Information
British Journal of Nutrition , Volume 69 , Issue 2 , March 1993 , pp. 527 - 532
Copyright
Copyright © The Nutrition Society 1993

References

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