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Vitamin E Forms for Turkeys

Departments of Animal Science and Veterinary Diagnostic Medicine, University of Minnesota, 1404 Gortner Avenue, St. Paul, MN 55108; Phone: (612) 624-7265; FAX: (612) 625-5789

Correspondence: P. E. Waibel

This study compares activities of micellized d--tocopherol, micellized d--tocopheryl acetate, and dl--tocopheryl acetate in turkeys as indicated by serum and liver storage levels. The influence of micellized d--tocopherol is observed at a somewhat greater level in drinking water. A comparison of vitamin E stability in feed is included.

Based on serum and liver -tocopherol and d--tocopherol and d--tocopheryl acetate showed equivalent biopotency at 10 and 25 IU/kg diet and were somewhat more potent than dl--tocopheryl acetate at 25 IU/kg diet. From time of hatching, serum and liver vitamin E concentrations fell markedly by 9 days of age and remained low through 26 days of age with vitamin E added to feed at 0 or 25 IU/kg. At 25 IU vitamin E/kg feed, serum storage of -tocopherol was greater with micellized d--tocopherol than with dl--tocopheryl acetate during 5 to 26 days. Sixty IU micellized d--tocopherol/kg drinking water resulted in relatively high liver and serum vitamin E during 5 to 26 days of age

Key Words: -tocopherol • metabolism • micellization • turkey • vitamin E