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Deposition of Tocopherol in Pork Tissue and Stability during Frozen Storage¹

Departments of Home Economics Research and Animal Husbandry, University of Idaho Agricultural Experiment Station, Moscow

Abstract

Chops from eight barrows and eight gilts raised on standard rations plus 0, 21.5, 43.0 or 64.5 gm./day of tocopherol supplement and 0 or 10 mg./day of an antibiotic feed supplement for 6 weeks prior to slaughter were frozen for 0, 3, 6, 9, 12, 15 and 18 months.

Supplementing swine rations with tocopherol and/or an antibiotic feed supplement produced no adverse effects upon the carcass characteristics of the animals. Supplementing swine rations with tocopherol significantly increased the concentration of total tocopherols in the loin. The concentration of total tocopherols decreased significantly during frozen storage. The TBA values increased significantly during frozen storage. Judges' scores for all palatability factors showed a highly significant decrease on frozen storage, the first serious loss of quality appearing at the 9-month storage period. No significant differences in palatability due to antibiotic or amount of tocopherol supplement were found. Scores for desirability generally decreased before manifestly rancid flavors and/or odors became apparent.

Increases in TBA values and losses in flavor and/or odor occurred while substantial amounts of vitamin E remained in the tissues.

¹ Published with the approval of the Director of the Idaho Agricultural Experiment Station as Research Paper No. 476.

² Formerly Assistant Home Economist, Jr., Department of Home Economics Research.

³ Present address: Albers Milling Company, Los Angeles, California.

⁴ The authors wish to acknowledge the kindness of Phillip L. Harris of Distillation Products Industries, Division of Eastman Kodak Company, Rochester, New York, for providing the Myvamix supplement; of the American Cyanamid Company, Pearl River, New York, for supplying the Aurofac 2A; of the Floridin Company of Tallahassee, Florida, for providing the Florex XXS; and of A. C. Wiese, Department of Agricultural Chemistry, Idaho Agricultural Experiment Station, University of Idaho, Moscow, Idaho, for advice on the chemical assays. They also wish to express their appreciation to those staff members who served as judges in this study.