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Sensitivity of Various Tissues of Holstein Calves to Tocopherol Intake¹

Storrs (Conn.) Agricultural Experiment Station³ and U. S. Department of Agriculture^,4

Abstract

Data obtained at the termination of three experiments on the total tocopherol concentrations of liver, heart, trapezius muscle and perinephric fat of Holstein male calves, receiving graded levels of tocopherol added to a basal ration in daily amounts ranging from 0.125 to 25.000 mg. per lb. of live weight and for periods ranging from 4 to 12 weeks duration, were studied for the purpose of determining the relative sensitivity of these tissues in reflecting tocopherol intake. Using the sensitivity concept of Mandel and Stiehler (1954), which in this study was the ratio of the rate of linear change of the logarithmic (base 10) tissue concentration of tocopherol on the logarithmic intake of tocopherol to the standard deviation per calf of the logarithmic tissue tocopherol concentration, it was found that the sensitivity was in the following descending order: heart, liver, perinephric fat and trapezius muscle. The first two named tissues were found to be approximately twice as sensitive to tocopherol intake as the latter two. Expressing tocopherol concentration on a per gram of lipid basis resulted in inappreciable change in sensitivity as compared to a wet basis as used above.

¹ This study was made in part with funds provided by the Wirthmore Feeds, Inc. and the Chas. H. Hood Dairy Foundation, Boston, Mass., as well as with funds provided by the Research and Marketing Act of 1946, through a contract between the Storrs (Conn.) Agricultural Experiment Station and the Dairy Cattle Research Branch, U.S.D.A. The data were from a thesis submitted to the Graduate School of the University of Connecticut by the senior author in partial fulfillment of the requirements for the M.S. degree. We are indebted to Mrs. Mae Miller and Mrs. Elaine Trantum for technical assistance and to various staff members and, in particular, D.G. Gosslee, Storrs Station Biometrician, for helpful suggestions.The Floridin Co., Tallahassee, Fla. kindly supplied the Florex used in the tocopherol analyses, the Nopco Chem. Co., through the courtesy of M. Hochberg, the vitamin A supplements and the American Cyanamid Co., through the courtesy of R. F. Elliott, the tocopherol supplements. A preliminary report of this study was given at the 32nd Annual Meeting of the Eastern Division of the American Dairy Science Association, Sept. 15, 1958, W. Springfield, Mass.

² Present address: U. S. Fishery Products Lab., Ketchikan, Alaska.

³ Animal Industries Department.

⁴ Dairy Cattle Research Branch, Agricultural Research Service (L.A.M.).