Plasma and Erythrocytic Concentrations of Electrolytes in Blood of Fetal and Maternal Swine

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SUMMARY The electrolyte concentrations (Na, K, and Cl) in erythrocytes and plasma and the total plasma CO 2 and hematologic values [erythrocyte count ( rbc ), packed cell volume ( pcv ), and hemoglobin concentration (Hb.)] were determined in fetal and maternal swine at different times during gestation. Erythrocytes of fetuses contained lower concentrations of Na and K and higher concentrations of Cl than did those of the maternal swine. Plasma of fetuses contained lower Cl and higher K concentrations and a greater CO 2 value than did maternal plasma. The Na concentration in fetal plasma was lower than that in maternal plasma early in gestation, but no difference existed later in gestation. The rbc and Hb. values were lower for fetuses than for sows. Mean corpuscular volume was greater for erythrocytes of fetuses. It was concluded that the control mechanism of maternal erythrocytic concentrations of K influenced erythrocytic concentrations of K in the fetuses, that the Na concentrations

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