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Magnesium fluxes during lactation in the rat.

Lactating rats fed a 0.055% Mg diet transferred 5.5 +/- SEM 0.3 mg per day of Mg into milk but remained in a slightly positive Mg balance by increasing both food consumption and fractional intestinal Mg absorption. Urinary Mg excretion increased continually during the course of lactation to values double those of non-lactating rats.