Abstract
FÆCAL magnesium comprises two fractions, an endogenous fraction originating from the body and excreted into the gut and an exogenous fraction representing unabsorbed dietary magnesium. Once the relative proportions of these two fractions are known, it is possible to calculate both the endogenous fæcal magnesium and the true availability of dietary magnesium. A method for determining these proportions would seem to be the comparative balance technique1, since this could be adapted for magnesium-28 provided the quantity of this isotope in a single dose was sufficient for accurate determination of the total eliminated in the fæces after either oral or intravenous administration. As the cost of magnesium-28 is very high the size of dose for economic reasons must be small, but this communication describes experiments which would appear to be satisfactory from both points of view.
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Hansard, S. L., Comar, C. L., and Plumlee, M. P., J. Animal Sci., 13, 25 (1954).
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Hansard, S. L., Comar, C. L., and Plumlee, M. P., J. Animal Sci., 11, 524 (1952).
Field, A. C., McCallum, Jennie W., and Butler, E. J., Brit. J. Nutr., 12, 433 (1958).
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FIELD, A. Balance Trials with Magnesium-28 in Sheep. Nature 183, 983 (1959). https://doi.org/10.1038/183983a0
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DOI: https://doi.org/10.1038/183983a0
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