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Effects of Different Vegetable Oils on Growth Performance and Tissue Fatty Acid Composition of Large Size Genetically Improved Farmed Tilapia (Oreochromis niloticus)

  • LI Xin ,
  • TAN Xiaochen ,
  • ZHANG Jian ,
  • YANG Ruibin ,
  • QIAN Xueqiao
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  • 1. Guangdong Haid Husbandry and Aquaculture Research Center, Guangzhou 511400, China;
    2. Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China

Received date: 2016-04-05

  Online published: 2016-10-17

Abstract

This experiment was conducted to explore the utilization effects of different vegetable oils for large size genetically improved farmed tilapia (GIFT, Oreochromis niloticus), and to screen out the optimal vegetable lipid sources for large size GIFT. Six isonitrogenous and isolipidic experimental diets were prepared with the lipid sources were soybean oil (SO), palm oil (PO), cottonseed oil (CO), rapeseed oil (RO), phospholipid (SL) and mixture oil (MIX, SO:PO:CO:RO:SL=1:1:1:1:1), respectively, to fed GIFT with an initial body weight of (229.92±0.31) g for eight weeks. Each experimental diet was fed four net cages and each net cage cultured 50 fish. The results showed as follows:the weight gain rate and specific growth rate of CO and MIX groups were significantly lower than those of RO group (P<0.05). The feed conversion ratio of RO group was significantly lower than that of MIX group (P<0.05), but no significant difference among other groups was found (P>0.05). The protein efficiency ratio of MIX group was significantly lower than that of RO and SL groups (P<0.05). The hepatosomatic index of MIX group was significantly higher than that of PO and RO groups (P<0.05). There were no significant differences in the weight gain rate, specific growth rate and feed conversion ratio among SO, RO, PO and SL groups (P>0.05). The total amount of muscle saturated fatty acids of SO and RO groups was significantly lower than that of other groups (P<0.05). For muscle n-3 fatty acids/n-6 fatty acids, RO group was significantly higher than that of other groups (P<0.05), but CO group was significantly lower than that of other groups (P<0.05). The total amount of liver saturated fatty acids of CO group was significantly higher than that of other groups (P<0.05), but that of RO group was significantly lower than that of other groups (P<0.05). For muscle n-3 fatty acids/n-6 fatty acids, RO group was significantly higher than other groups (P<0.05). The related coefficients between muscle fatty acid composition and dietary fatty acid composition were higher than the related coefficients between liver fatty acid composition and dietary fatty acid composition. Among the related coefficients between muscle or liver fatty acid composition and dietary fatty acid composition, the highest values were found in PO group and the lowest values were found in SL group. The results suggest that RO, SO, PO and SL can be good lipid sources for the diet of large size GIFT (body weight:230 to 790 g). Fatty acid composition of muscle in large size GIFT is affect by dietary fatty acid composition on a certain extent, but the correlation between liver fatty acid composition and dietary fatty acid composition is smaller.

Cite this article

LI Xin , TAN Xiaochen , ZHANG Jian , YANG Ruibin , QIAN Xueqiao . Effects of Different Vegetable Oils on Growth Performance and Tissue Fatty Acid Composition of Large Size Genetically Improved Farmed Tilapia (Oreochromis niloticus)[J]. Chinese Journal of Animal Nutrition, 2016 , 28(10) : 3327 -3336 . DOI: 10.3969/j.issn.1006-267x.2016.10.037

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