Effects of Selenium Source and Selenium Level on Growth Performance, Liver and Serum Antioxidant Indices and Selenium Content in Tissues of Juvenile Cobia (Rachycentron canadum)

YANG Yuanzhi; NIE Jiaquan; TAN Beiping; DONG Xiaohui; YANG Qihui; CHI Shuyan

doi:10.3969/j.issn.1006-267x.2016.12.022

2016 , Vol. 28 >Issue 12: 3894 - 3904

DOI: https://doi.org/10.3969/j.issn.1006-267x.2016.12.022

Molecular Nutrition

Effects of Selenium Source and Selenium Level on Growth Performance, Liver and Serum Antioxidant Indices and Selenium Content in Tissues of Juvenile Cobia (Rachycentron canadum)

YANG Yuanzhi ,
NIE Jiaquan ,
TAN Beiping ,
DONG Xiaohui ,
YANG Qihui ,
CHI Shuyan

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1. Laboratory of Aquatic Animal Nutrition and Feed, Fisheries College, Guangdong Ocean University, Zhanjiang 524088, China;
2. South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center, Guangzhou 510006, China

Received date: 2016-06-12

Online published: 2016-12-17

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Abstract

A feeding trial was carried out to investigate the effects of selenium (Se) source and Se level on growth performance, liver and serum antioxidant indices and Se content in tissues of juvenile cobia (Rachycentron canadum), in order to determine the Se requirement from different Se sources of juvenile cobia. Nine experimental diets (control diet was shared) were prepared by supplementing 0 (control), 0.3, 0.6, 0.9 and 1.2 mg/kg Se from sodium selenite (Se-S) or selenium methionine (Se-Met), respectively. Juvenile cobia with an initial body weight of (22.18±0.35) g were fed to satiation for 10 weeks. Fish in three cages (replicates) were fed a kind of experimental diet and 30 fish in a cage. The results showed as follows:1) Se level extremely significantly affected the weight gain rate (WGR) and specific growth rate (SGR) (P<0.01), but did not significantly affected the feed conversion ratio (FCR) and survival rate (SR) (P>0.05). The SGR, WGR, FCR and SR were not affected by Se source and the interaction of Se source and Se level (P>0.05). With the Se level increasing, the SGR and WGR were increased firstly and then decreased. 2) The glutathione peroxidase (GSH-Px), glutathione reductase (GR) activities and malondialdehyde (MDA) content in liver and GSH-Px activity in serum were extremely significantly affected by Se level (P<0.01), and GR activity in serum was significantly affected by Se level (P<0.05). The GR, total superoxide dismutase (T-SOD), catalase (CAT) activities and MDA content in liver and T-SOD activity in serum were extremely significantly affected by Se source (P<0.01). The interaction of Se level and Se source had significant effects on liver CAT activity, MDA content and serum T-SOD activity (P<0.05). With the Se level increasing, the activity of GSH-Px in liver and serum was increased firstly and then stabilized, and the GR activity in liver and serum was firstly decreased and then stabilized. The highest GSH-Px activity and the lowest GR activity in liver were obtained at the 0.9 mg/kg added level from two Se sources. The CAT activity in liver was increased with the Se level increasing. 3) Se content in vertebrae, liver and whole body was increased with Se level increasing. Se content in vertebrae was extremely significantly affected by Se source (P<0.01). Se content in liver and vertebrae was extremely significantly affected by the interaction of Se level and Se source (P<0.01). In conclusion, using Se-Met and Se-S as Se sources, the highest SGR of juvenile cobia can be obtained when dietary Se level is 1.29 and 1.46 mg/kg, respectivly, by quadratic polynomial regression equations. With SGR and Se content in whole body as dependent variables, the biological utilization of Se-Met is 1.20 and 2.90 times that of Se-S, respectivly.

Key words： juvenile cobia (Rachycentron canadum); selenium; growth performance; antioxidant enzyme; selenium accumulation

Cite this article

YANG Yuanzhi , NIE Jiaquan , TAN Beiping , DONG Xiaohui , YANG Qihui , CHI Shuyan . Effects of Selenium Source and Selenium Level on Growth Performance, Liver and Serum Antioxidant Indices and Selenium Content in Tissues of Juvenile Cobia (Rachycentron canadum)[J]. Chinese Journal of Animal Nutrition, 2016 , 28(12) : 3894 -3904 . DOI: 10.3969/j.issn.1006-267x.2016.12.022

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