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Effects of lipid sources and lipid peroxidation on feed intake, growth, and tissue fatty acid compositions of largemouth bass (Micropterus salmoides) |
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| Authors: | Biao Yun Min Xue Jia Wang Zhi-ying Fan Xiu-Feng Wu Yin-Hua Zheng Yu-Chang Qin |
| Institution: | 1. National Aquafeed Safety Assessment Station, Feed Research Institute, The Chinese Academy of Agricultural Sciences, Beijing, 100081, People’s Republic of China 3. The Key Laboratory of Mariculture (Education Ministry of China), Ocean University of China, Qingdao, 266003, People’s Republic of China 2. Aquaculture Research Center, Beijing Enhalor Biotechnique Co. Ltd., Beijing, 100081, People’s Republic of China |
| Abstract: | A 12-week growth trial was conducted to study the effects of replacement of fish oil (FO) with four alternative lipid sources (soybean oil, SO; beef tallow, BT; poultry fat, PF and; palm oil, PO, respectively) on the growth performance, feed intake (FI), and fatty acid (FA) composition in muscle and liver of largemouth bass (Micropterus salmoides) with initial body weight of 6.6 ± 0.01 g. Five isonitrogenous and isoenergetic diets were formulated and added with 5.5 % of each lipid sources, and FO was used as a control group. Until week 8 of the experiment, fish were fed on diets that were conserved at ?20 °C, and fish were fed diets that oxidized at 28–30 °C with natural illumination for 4 weeks during 8–12 week. After 8 weeks of growth trial, specific growth rate and feed conversion of largemouth bass fed BT diet were significantly lower and higher, respectively, than that other dietary treatment (P < 0.05). The fish of PF group had the highest growth performance (P < 0.05). The lipid sources did not affected FI of largemouth bass (P > 0.05). However, growth performance precisely reversed during 8–12 week, and finally, no significant difference was found on growth during 1–12 week. The FA compositions of fish muscle and liver of each treatment reflected the corresponding dietary FA compositions. These results suggested that largemouth bass was sensitive to both of lipid sources and lipid oxidation. Fresh FO, SO, and PF could be optimal lipid sources. Likewise, slightly oxidation of these oils would negatively affected fish growth performance. |
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