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Effect of Dietary Protein Level on Several Oxidative Enzymes of the Heart, Muscle and Liver of Cattle¹

Department of Animal Husbandry and Nutrition, University of Florida, Gainesville

Twenty Hereford heifers 26 months of age were divided equally into 4 dietary groups and fed rations containing 1.34, 1.06, 0.71 and 0.62 lb. of crude protein per day as cottonseed meal, cane molasses, Pangola hay and a mineral-vitamin mixture. The heifers were fed the rations for 160 to 180 days before being slaughtered. They were fed for 112 days and then bred during the next two estrous periods, if needed. Forty-four days later dietary groups 1, 2, 3 and 4 had 3, 4, 1 and 3 normal embryos, respectively. Pregnancy had no effect on enzyme activity.

Succinoxidase decreased (P < 0.05) in the heart ventricle, but increased (P < 0.01) in the gracilis muscle as the dietary protein decreased.

Approximately three times as much lactic dehydrogenase was found in the heart as in the muscle, but the rations had no effect on the enzyme in either tissue.

Xanthine oxidase activity increased (P < 0.01) in the liver of the lower dietary protein groups.

The protein in the heart (P < 0.05), gracilis muscle (P < 0.05) and liver (P < 0.01) decreased as the dietary protein was decreased.

Manuscript received 17 July 1958.