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Tissue Storage and Apparent Absorption of Alpha- and Gamma-Tocopherols by Holstein Calves Fed Milk Replacer¹

Animal Industries Department

D. G. Gosslee

Storrs (Conn.) Agricultural Experiment Station, Storrs

ABSTRACT

Gamma- or alpha-tocopherol was fed in a milk replacer at two levels, 1.0 and 3.0 mg. per pound of live weight per day, to 12 Holstein male (22 ± 2 days old) calves for a 14-day period. Based on total tocopherol analyses, gamma-tocopherol was found to have 49% of the value of alpha when utilizing plasma concentration as the criterion, 22% when using liver concentration, and 44% when using heart concentration. Based on paper chromatographic separation of alpha and gamma (in this separation, the gamma fraction also included the beta and zeta forms of tocopherol) similar values were, respectively, 26, 1, and 13%. The calves receiving gamma-tocopherol had a considerably higher proportion of other forms of tocopherol (particularly alpha) in their tissues than calves receiving alpha-tocopherol, thereby indicating a possible dietary interaction between the two forms of tocopherol. Based on apparent alimentary (canal) absorption, gamma-tocopherol was found to be of slightly greater value than alpha; 104% as determined from total tocopherol analyses and 107% as determined by paper chromatographic separation of alpha and gamma.

¹ This study was supported in part with grant-in-aid funds provided by Wirthmore Feeds, Inc., Waltham, Massachusetts. The data are, in part, from a thesis submitted by the senior author to the Graduate School of the University of Connecticut in partial fulfillment of the requirements for the M.S. degree.

² Present address: Animal Husbandry Department, Cornell University, Ithaca, New York.

³ Present address: Animal Science Department, Ohio Agricultural Experiment Station, Wooster, Ohio.