[Patterns of redistribution of calcium and magnesium in the tissues of lactating white mice].

The Ca2+ and Mg2+ contents in the blood, milk and tissues involved in lactation, were studied in lactating and non-lactating albino mice. The Ca2+ concentration in the blood plasma of lactating mice was raised by 25%, and Mg2+--by 78%. The tissue concentrations of these ions did not change during lactation in muscles. The Ca2+ level was raised by 41% in the red cells in lactation, and Mg2+--by 55%; the concentration of Ca2+ and Mg2+ in the mammary alveolar tissue was respectively 4.4 and 2.9 times higher than in non-lactating animals. The data obtained suggest an interrelationship between the tissue ion content and the degree of enhancement of specific activity of the tissue during lactation.