HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Dunkley, W. L. Articles by Robb, J. Search for Related Content PubMed Articles by Dunkley, W. L. Articles by Robb, J.

Tocopherol Concentration and Oxidative Stability of Milk from Cows Fed Supplements of d or dl--Tocopheryl Acetate

Departments of Food Science and Technology, and Animal Science, University of California, Davis

ABSTRACT

In a Latin square changeover feeding trial, cows were fed d- or dl--tocopheryl acetate at 0.0025% of tocopherol in the dry matter intake, which provided respective average daily intakes of -tocopherol (and IU of vitamin E) of 400 mg (596 IU) and 390 mg (429 IU). The d supplement gave a significantly higher concentration (µg/g lipid) of tocopherols in the milk (P < 0.01), but the difference between the two supplements in the per cent of -tocopherol that transferred to milk was not significant. The ratio of the increase in the per cent transferred that was attributable to the supplements was 1.43:1, which is similar to the generally accepted ratio (1.36:1) of vitamin E activity of the two forms. Differences in oxidative stability of the milk were not significant, possibly because the cows produced milks with relatively high oxidative stability when they were fed the control ration (i.e., without a tocopherol supplement). Data from several feeding trials revealed that the amount of -tocopherol that transferred from feed to milk averaged about 2%. For milk samples collected during two field trials, correlations of flavor scores with the tocopherol concentrations did not differ significantly from zero, whereas correlations with the copper concentrations did.