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Effects of Phytic Acid on Zinc Availability and Parakeratosis in Swine¹

University of Missouri^,3, Columbia

Abstract

The addition of phytic acid to a diet based on animal protein produced symptoms of parakeratosis and growth depression which are typical of plant protein diets. Zinc supplementation completely counteracted the effect of phytic acid and lead to the conclusion that the effect of phytic acid was to make zinc less available. No parakeratotic lesions occurred among animals fed the casein basal ration without phytic acid or among any that received supplementary zinc.

Calcium was fed at a level of 1.5% and 0.8% with and without phytic acid. There was not a significant difference in growth rate between the two levels of calcium in the absence of phytic acid, but phytic acid caused a greater depression of growth rate on the high than on the low calcium diet in swine.

¹ Published with the approval of the Director of the Missouri Agricultural Experiment Station. Journal Series No. 2340.

² The authors express appreciation to L. D. Kintner, School of Veterinary Medicine for the preparation and interpretation of histological specimens; also gratefully acknowledge the following gifts: Folic acid from American Cyanamid Co., Pearl River, N. Y., Vitamin A from Distillation Industries, Rochester, N. Y. and other vitamins from Merck and Co., Inc., Rahway, N. J.

³ Department of Agricultural Chemistry.

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