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Vitamin E Stability in Corn and Mixed Feed

University of Guelph, Guelph, Ontario, Canada

Abstract

The stability of natural a-tocopherol in corn processed and stored under different conditions was evaluated in one experiment and the stability of supplemented -tocopherol acetate in mixed feeds was evaluated in two experiments. Artificial drying of corn containing approximately 75% dry matter to a dry matter content of approximately 87.5% caused only a slight reduction in the -tocopherol content (9.30 vs 8.99 µg/g D.M.). Subsequent storage of the artificially dried corn for 230 days resulted in a further small decrease in the -tocopherol content. The -tocopherol content of samples of high moisture corn which were ensiled or treated with propionic or acetic-propionic acids decreased throughout the storage period from an initial level of 9.30 µg to a final level of 1.18 µg/g D.M. Supplemental -tocopherol acetate was relatively stable in mixed feeds regardless of the moisture content and in a vitamin mineral premix when stored for 70 to 84 days.

¹ Department of Animal and Poultry Science.

² School of Engineering.