Effects of Surfactin Supplementation on Growth Performance, Serum Biochemical Indexes and Lipid Metabolism of Genetically Improved Farmed Tilapia(Oreochromis niloticus)

ZHAI Shaowei; LI Jian; SUN Xiuwen

doi:10.3969/j.issn.1006-267x.2015.12.038

2015 , Vol. 27 >Issue 12: 3959 - 3967

DOI: https://doi.org/10.3969/j.issn.1006-267x.2015.12.038

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Effects of Surfactin Supplementation on Growth Performance, Serum Biochemical Indexes and Lipid Metabolism of Genetically Improved Farmed Tilapia(Oreochromis niloticus)

ZHAI Shaowei ,
LI Jian ,
SUN Xiuwen

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Fisheries College of Jimei Univeristy, Xiamen 361021, China

Received date: 2015-06-04

Online published: 2015-12-14

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Abstract

A 7-week feeding trial was conducted to evaluate the effects of surfactin supplementation on growth performance, serum biochemical indexes and lipid metabolism of genetically improved farmed tilapia(GIFT, Oreochromis niloticus). Two hundred and forty GIFT with the average body weight of(12.0±0.1) g were randomly divided into four groups with four replicates in each group and 15 fish in each replicate. The fish of four groups were fed experimental diets supplemented with 0(control group), 50, 100 and 200 mg/kg surfactin, respectively. Results showed as follows:the final body weight, weight gain rate and specific growth rate were significantly increased by surfactin supplementation(P<0.05), and final body weight, weight gain rate and specific growth rate of 50 mg/kg supplementation group were significantly higher than those of 200 mg/kg supplementation group(P<0.05); the feed conversion ratio was significantly decreased by surfactin supplementation(P<0.05). Feeding rate and survival rate of all groups were similar(P>0.05). The lipase activity(except the 50 mg/kg supplementation group) in intestinal tract was significantly increased by surfactin supplementation(P<0.05), but the activities of amylase and protease were not significantly different among all groups(P>0.05). The serum urea nitrogen level was decreased by surfactin supplementation, and the significant difference was found between 50 mg/kg supplementation group and control group(P<0.05). The levels of serum albnmin and free fatty acid of supplementation groups were significantly higher than those of control group(P<0.05). The levels of serum total cholesterol(except the 200 mg/kg supplementation group) and triglyceride of supplementation groups were significantly lower than those of control group(P<0.05). The activities of serum acid phosphatase and alkaline phosphatase were not significantly different among all groups(P>0.05). The serum lysozyme activity of surfactin supplementation groups were significantly higher than that of control group(P<0.05), and the lysozyme activity of 50 mg/kg supplementation group was the highest among all groups. Compared with control group, the fatty acid synthetase level in hepatopancreas of supplementation groups were significantly decreased(P<0.05), while the acetyl CoA carboxylase level in hepatopancreas was not affected by surfactin supplementation(P>0.05). The activities of hepatic lipase and lipoprotein lipase in hepatopancreas were significantly increased by surfactin supplementation(P<0.05), but no significant differences of those two enzymes were found among all supplementation groups(P>0.05). In conclusion, the recommended dietary surfactin supplementation level is 50 mg/kg, which can increase the intestinal lipase activity, improve the serum biochemical indexes and regulate the enzyme levels/activities of lipid metabolism, and then improve the growth of GIFT under present experimental condition.

Key words： surfactin; genetically improved farmed tilapia; growth performance; lipid metabolism

Cite this article

ZHAI Shaowei , LI Jian , SUN Xiuwen . Effects of Surfactin Supplementation on Growth Performance, Serum Biochemical Indexes and Lipid Metabolism of Genetically Improved Farmed Tilapia(Oreochromis niloticus)[J]. Chinese Journal of Animal Nutrition, 2015 , 27(12) : 3959 -3967 . DOI: 10.3969/j.issn.1006-267x.2015.12.038

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