Effect of Dietary Protein, Vitamin E and Age on the Lactic Dehydrogenase and Succinoxidase of the Hearts of Rats

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Abstract
A study has been made of the effect of two dietary levels of protein (14.3 and 23.7%), each with and without vitamin E (dl, α-tocopherol acetate), upon the lactic dehydrogenase and succinoxidase activity of the heart ventricle of rats at 65, 95, 185 and 365 days of age. The animals were placed on the diets by litters at 12 days of age. Vitamin E aided (P < 0.01) the growth of the rats fed the low-protein diets. The groups fed the low dietary protein had more (P < 0.01) lactic dehydrogenase and succinoxidase activity in the heart. Those fed vitamin E had more (P < 0.05) succinoxidase, but a similar amount of lactic dehydrogenase activity in the heart, compared to the rats deprived of vitamin E. As the rats grew older the lactic dehydrogenase increased (P < 0.01), but age had no effect on the succinoxidase activity. Sex did not affect the activity of either enzyme.