Abstract
Summary
A significant increase in the succinoxidase activity of fetal swine ventricles was found to occur during the latter half of gestation, on both the wet weight and per unit of nitrogen basis. As gestation approached termination, an increase in activity occurred in the left ventricles of the maternal heart. These observations show that in large animals the fetal heart increases in succinoxidase activity with increased function, as previously demonstrated in the rat and chick; and that the later stages of gestation make increased requirements of the heart as indicated by greater maternal heart enzymatic activity. Two dietary levels of Mn and position of the fetuses in the uteri had no influence on the succinoxidase activity.
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