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- W2590736720 abstract "The effects of oxidized dietary lipid and the role of vitamin E on growth performance,health status, and muscle and liver quality of juvenile Atlantic cod (Gadus morhua) wereevaluated over a 9-week feeding period. Four isonitrogenous experimental dietscontaining fresh or oxidized fish oil with or without added vitamin E (a-tocopherol ormixed tocopherols) were fed to juvenile cod in duplicate tanks. The highly oxidized lipidused had a peroxide value of 94 meq/kg oil.No significant change (P>0.05) on growth performance or feed utilization was observedwhen oxidized dietary lipid was used. The erythrocyte osmotic fragility (EOF), referredto as susceptibility to hemolysis, of fish fed oxidized oil without added vitamin E washigh in comparison with those fed unoxidized oil. Supplementation of δ-tocopherolappeared to decrease the hemolysis, but mixed tocopherols had no significant effect(P>0.05) on EOF.The proximate composition of fish whole body was also affected by oxidized oil andvitamin E. Fatty acid composition of liver total lipid reflected that of dietary lipid.However, muscle lipid contained high levels of polyunsaturated fatty acids (PUFA)compared to that of liver lipid, as expected. Both muscle and liver fatty acid compositionfollowed the same trend among the treatments as those of dietary fatty acids. Fish fedfresh oil had a higher proportion of polyunsaturated fatty acids (PUFA) in muscle andliver lipid than those fed oxidized oil. Fatty acid composition of neutral lipids andphospholipids in fish muscle tissue was also analyzed. A larger quantity of eicosapentaenoic acid (EPA) was present in neutral lipid fraction, while phospholipidscontained a higher amount of docosahexaenoic acid (DHA).Oxidized oil significantly (P<0.05) decreased the deposition of α-tocopherol in liver butnot in muscle. Gamma- and δ-tocopherols from dietary tocopherols mixture were retainedat very low levels in liver but higher retention was observed in muscle. The oxidativestate of both liver and muscle, as measured by the 2-thiobarbituric acid reactivesubstances (TBARS) and headspace propanal, negatively correlated with tissue vitamin Elevels.It is suggested that oxidized oil affected juvenile Atlantic cod by causing vitamin Edeficiency in certain tissues and that these effects could be alleviated by supplementationof a sufficient amount of vitamin E through diet. It is also indicated that mixedtocopherols were good antioxidants for Atlantic cod, although less effective than α-tocopherolalone in many tissues with the exception of muscle, where γ-. and δ-tocopherols were deposited at considerably high levels. Due to the fact that muscles arethe major edible part of fish, these results may be useful to fish farmers for producing fishwith better oxidative stability and hence extended shelf life during storage." @default.
- W2590736720 created "2017-03-03" @default.
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- W2590736720 date "2006-01-01" @default.
- W2590736720 modified "2023-09-26" @default.
- W2590736720 title "Effect of oxidized dietary lipid on growth, muscle and liver quality of juvenile Atlantic cod (Gadus morhua), and the protective role of vitamin E" @default.
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