Effect of dietary linseed and sunflower oil on cholesterol and fatty acid contents in rainbow trout (Oncorhynchus mykiss) fillets
2003
Zelenka, J. | Fajmonova, E. | Komprda, T. | Kladroba, D. | Sarmanova, I. (Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Agronomicka Fakulta)
Rainbow trouts (Oncorhynchus mykiss) were fed a diet containing 2.5 or 5 % of linseed (L) or sunflower (S) oil (L2.5, L5, S2.5, S5), or a mixture (5 %) of both oils (LS5). Control group (0) received a commercial feed mixture. After 75 days of feeding 16 individuals from each of the six groups were selected to estimate the content of nutrients in flayed fillets. There were no significant differences in weight gains and concentrations of dry matter, fat, crude protein, cholesterol, saturated and monounsaturated fatty acids, arachidonic, eicosapentaenoic and docosahexaenoic acids, respectively, in meat of fish fed the different diets. Meat of controls contained less polyunsaturated fatty acids (PUFA) than meat of fish fed the feed mixtures L5, S5 and LS5 (P0.05-0.01). When only L was used, trout meat contained less linoleic acid and more alpha-linolenic acid (P0.01) than after feeding a diet containing S. Fish receiving S showed significantly higher levels of n-6 PUFA in their meat than all other groups. The concentration of n-3 PUFA was significantly (P0.05-0.01) higher in the group receiving L than in that fed S alone. In the group L5, the n-3/n-6 PUFA ratio in meat was significantly (P0.01) higher than in all other groups.
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