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  • Title: Vitamin E requirement of mink with special reference to tocopherol composition in plasma, liver, and adipose tissue.
    Author: Työppönen J, Hakkarainen J, Juokslahti T, Lindberg P.
    Journal: Am J Vet Res; 1984 Sep; 45(9):1790-4. PubMed ID: 6497135.
    Abstract:
    Tissue responses of 4 different tocopherols found in a basal diet (BD) and the effect of 2 physiologic levels of dl-alpha-tocopheryl acetate (25 and 150 mg/kg) on tissue tocopherol content were studied in the mink. The BD contained a total of 7.1 mg vitamin E/kg, with alpha-, beta-, gamma-, and delta-tocopherol in a ratio of 1:0.07:0.55:0.10, respectively. The corresponding ratios in the tissues were: liver, 1:0.04:0.12:0; plasma, 1:0:0.13:0; and adipose tissue, 1:0:0.19:0. After mink were fed diets containing vitamin E, alpha- and gamma-tocopherol were distributed in similar proportions in plasma and liver, but gamma-tocopherol was in a slightly higher proportion in adipose tissue. Addition of 25 or 150 mg/kg of alpha-tocopheryl acetate to the BD decreased the gamma-tocopherol levels in all 3 tissues; this was considered to be a dilution effect of other tocopherols in BD with added alpha-tocopheryl acetate. The beta-tocopherol content in the liver remained unchanged, irrespective of the dietary amount of alpha-tocopheryl acetate. Plasma alpha-tocopherol had a linear relationship to log dietary dose, with an apparent half-saturation of the vitamin E binding capacity at 13 mg vitamin E/kg diet. At the given dietary levels, liver and adipose continued to accumulate alpha-tocopherol. The correlation between total plasma lipids and plasma alpha-tocopherol was significant (P less than 0.001) only in the group fed the BD. Vitamin E analysis of plasma could be used as a routine method for controlling the vitamin E status of mink.(ABSTRACT TRUNCATED AT 250 WORDS)
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