Influence of Dietary Oil Sources on Muscle Composition and Plasma Lipoprotein Concentrations in Nile Tilapia, Oreochromis niloticus
2011
Ferreira, Milena W. | de Araujo, Felipe G. | Costa, Diego V. | Rosa, Priscila V. | Figueiredo, Henrique C.P. | Murgas, Luis D.S.
To investigate the impact of different dietary lipid sources on fillet composition and lipid transport, we conducted a feeding trial and evaluated the proximate composition of muscle tissue, fatty acid profiles, total cholesterol (in muscle and plasma), triglycerides, and lipoprotein concentrations in Nile tilapia, Oreochromis niloticus. Five semi-purified diets, containing different oils (soybean - SO, corn - CO, linseed - LO, fish - FO, and olive - OO), were supplied to tilapia for 160 d. Fish fed with LO and FO diets had a lower percentage of total lipids in muscle compared with the others (P < 0.05). The highest percentage of protein was found in fish fed with FO diet (P < 0.05). The muscle fatty acid profile was influenced differently by diets (P < 0.05). The group supplemented with SO and CO had a higher concentration of 18:2n-6, whereas the fish fed with LO diet had a higher level of 18:3n-3 and those that received the FO diet had more 22:6n-3 in comparison with those supplemented with vegetable oils. Plasma lipid transport was also affected by the diets: the fish fed with FO diet had higher total cholesterol and high-density lipoprotein and lower very-low-density lipoprotein concentrations (P < 0.05).
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