Effect of dietary vitamin E on rainbow trout (salmo gairdneri). Muscle alpha-tocopherol and storage stability.
An experiment was conducted to study the effect of dietary vitamin E (basal alpha-tocopherol plus supplemental DL-alpha-tocopheryl acetate) on the muscle alpha-tocopherol levels in rainbow trout. The relationship of muscle alpha-tocopherol and its storage stability were measured by changes in thiobarbituric acid number (TBA) between one year frozen storage (-17 degrees C) and one year frozen (-17 degrees C) plus 7 days' refrigeration (2 degrees C). The alpha-tocopherol content in the muscle of fish fed the experimental diets for 24 weeks was significantly (p less than 0.05) increased only by a very high level of dietary vitamin E. Changes in TBA between frozen and frozen-refrigerated storage were not significantly (p less than 0.05) affected by the dietary treatments. The expected improvement of storage stability in muscle of fish fed high dietary vitamin E was not observed. These data suggest that the response of muscle alpha-tocopherol to dietary vitamin E was too low to be economically feasible while a large amount of dietary vitamin E was deposited in the liver which is normally discarded during processing.
D000818:Animals; D004041:Dietary Fats / Q000008:administration & dosage; D004355:Drug Stability; D005519:Food Preservation; D008054:Lipid Peroxides / Q000008:administration & dosage; D008099:Liver / Q000378:metabolism*; D009132:Muscles / Q000378:metabolism*; D012487:Salmonidae / Q000378:metabolism*; D024505:Tocopherols; D014337:Trout / Q000378:metabolism*; D014810:Vitamin E / Q000031:analogs & derivatives / Q000378:metabolism* / Q000494:pharmacology; D024502:alpha-Tocopherol / Q000031:analogs & derivatives*
D004041:Dietary Fats; D008054:Lipid Peroxides; D014810:Vitamin E; D024502:alpha-Tocopherol; D024505:Tocopherols