Effects of Tea Polyphenol on Growth, Digestion Function, Immune Performance and Disease Resistance Capability of Hybrid Tilapia (Oreochromis niloticus&times;O. aureus)

LIANG Gaoyang, LI Xiaoqin, YANG Hang, POOLSAWAT Lumpan, GAO Bowei, LENG Xiangjun

doi:10.3969/j.issn.1006-267x.2018.08.039

2018 , Vol. 30 >Issue 8: 3199 - 3207

DOI: https://doi.org/10.3969/j.issn.1006-267x.2018.08.039

Molecular Nutrition

Effects of Tea Polyphenol on Growth, Digestion Function, Immune Performance and Disease Resistance Capability of Hybrid Tilapia (Oreochromis niloticus×O. aureus)

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1. National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China;
2. Centre for Research on Environmental Ecology and Fish Nutrition of the Ministry of Agriculture, Shanghai Ocean University, Shanghai 201306, China;
3. Shanghai Collaborative Innovation for Aquatic Animal Genetics and Breeding, Shanghai Ocean University, Shanghai 201306, China

Received date: 2018-02-06

Online published: 2018-08-18

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Abstract

The objective of the present study was to investigate the effects of tea polyphenol (TP) on the growth, digestion function, immune performance and disease resistance capability of hybrid tilapia (Oreochromis niloticus×O. aureus). Six experimental diets were designed which were added 0 (control group), 100, 200, 400, 600 and 800 mg/kg TP into a basal diet, and each diet fed to one group of hybrid tilapia with an initial body weight of (6.09±0.07) g for 9 weeks. Each group had three replicates and each replicate cultured 25 fish. The results showed that the weight gain rate and feed conversion ratio in supplementing TP groups had no significant changes compared with control group (P>0.05), but the weight gain rate in 100 and 200 mg/kg TP groups showed an increase trend, it in 400 to 800 mg/kg TP groups showed a decrease trend, and 200 mg/kg TP group had the maximal weight gain rate. Whole body moisture, crude protein and ash contents, and crude protein digestibility showed no significant differences among groups (P>0.05), but the high supplemental levels (600 to 800 mg/kg) of TP significantly decreased the whole body ether extract content, the activities of amylase and protease of intestine as well as dry matter digestibility compared with control group (P<0.05). Compared with control group, diet supplemented with 200, 400, 600 and 800 mg/kg TP significantly promoted the activities of superoxide dismutase (SOD) and lysozyme (LZM) in serum (P<0.05), and the serum malonaldehyde (MDA) content was increased firstly and then decreased with the increase of TP supplemental level. The maximum serum SOD activity and the minimum serum MDA content were observed in 200 mg/kg TP group, and the maximum serum LZM activity was observed in 400 mg/kg TP group. After challenged with Aeromonas hydrophila for 48 and 96 h, the cumulative mortality was significantly decreased by the supplementation of 200, 400, 600 and 800 mg/kg TP (P<0.05), and 400 mg/kg TP group had the lowest cumulative mortality among groups. In a conclusion, TP can promote the immune performance and reduce the mortality against Aeromonas hydrophila, but has no significant effects on growth of hybrid tilapia. The optimal TP supplemental level in diets of hybrid tilapia is suggested to be 200 to 400 mg/kg.

Key words： tea polyphenol; hybrid tilapia; growth; digestibility; immune performance; disease resistance capability

Cite this article

LIANG Gaoyang, LI Xiaoqin, YANG Hang, POOLSAWAT Lumpan, GAO Bowei, LENG Xiangjun . Effects of Tea Polyphenol on Growth, Digestion Function, Immune Performance and Disease Resistance Capability of Hybrid Tilapia (Oreochromis niloticus×O. aureus)[J]. Chinese Journal of Animal Nutrition, 2018 , 30(8) : 3199 -3207 . DOI: 10.3969/j.issn.1006-267x.2018.08.039

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