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Blood Plasma and Tissue Concentrations of Vitamin E in Beef Cattle as Influenced by Supplementation of Various Tocopherol Compounds^1,2,

University of Florida, Gainesville 32611

Abstract

Twenty-four crossbred beef cows were used to investigate the concentration of -tocopherol in plasma and tissues following oral administration of four tocopherol sources. Animals were allotted to the following treatments: DL--tocopherol, D--tocopherol, DL-tocopheryl acetate and D--tocopheryl acetate. Animals received a daily oral dose of 1,000 IU of the respective tocopherol treatment for 28 d and then were slaughtered. Blood samples were collected on d 0, 1, 7, 14 and 28 for tocopherol concentration assays, and samples from 10 different tissues were collected from slaughtered cows. Identification of -tocopherol in tissues was confirmed by HPLC retention times and by comparison of mass spectra with that of -tocopherol standards. The D--tocopherol and its acetate ester increased plasma tocopherol concentration faster than the racemic products, the greatest response occurring with D--tocopherol. Across all treatments, the highest -tocopherol concentrations were noted in the adrenal gland and liver, the lowest in muscle and thyroid tissue. Tissue analyses confirmed that in adrenal gland, kidney, liver and lung, -tocopherol concentrations were higher following D- than DL--tocopherol supplementation.

¹ Florida Agric. Exp. Sta. journal series no. 8464.

² This research was supported in part by the USDA under CSRS Special Grant No. 86-CRSR-2-2843 managed by the Caribbean Basin Advisory Group (CBAG).

³ Dept. of Anim. Sci.

⁴ Experimental Farm, Agriculture Canada, Nappan, N. S. BOL 1CO.

⁵ 2R, 4'R, 8'R refers to the natural isomer, equivalent to D--tocopherol.

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