Mineral Utilization in the Rat

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Abstract
One hundred and ten weanling male albino rats were used in a 7-week feeding trial to investigate the rate of restoration of blood serum and bone ash Mg and to study during a repletion period the fate of Ca deposited in the kidneys consequent to a Mg deficiency. After a 4-week depletion, blood serum Mg increased to normal values within 7 days of repletion, bone ash Mg values increased significantly only during the second week of repletion, and kidney calcium values, elevated as a result of the deficiency, were not significantly decreased during the 3-week recovery period. The data also show the Mg requirement to be higher for rats fed the isolated soy protein, lactose diet employed in this test than for rats fed a casein glucose diet in a previous study.