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Effects of Dietary β-Glucan on Growth Performance, Body Composition, Serum Biochemical Indices and Anti-Ammonia-Nitrogen Stress Ability of Japanese Seabass (Lateolabrax japonicus)

  • WU Chunyu ,
  • CAO Junming ,
  • HUANG Yanhua ,
  • WANG Guoxia ,
  • ZHAO Hongxia ,
  • LIU Xiaoling ,
  • FU Jingjing ,
  • LI Lin
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  • 1. College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China;
    2. Institute of Animal Science, Guangdong Academy of Agricultural Science, Guangzhou 510640, China;
    3. Guangdong Public Laboratory of Animal Breeding and Nutrition, Guangzhou 510640, China;
    4. Guangdong Key Laboratory of Animal Breeding and Nutrition, Guangzhou 510640, China

Received date: 2013-06-21

  Online published: 2013-11-19

Abstract

This experiment was conducted to investigate the effects of dietary β-glucan on growth performance, body composition, serum biochemical indices and anti-ammonia-nitrogen stress ability of Japanese seabass (Lateolabrax japonicus). A total of 720 Japanese seabass with the body weight of (8.35±0.17) g were randomly divided into 6 groups with 4 replicates per group and 30 fish per replicate. The fish in control group were fed a basal diet, and the fish in β-glucan supplemental groups were fed the experimental diets supplemented with 0, 200, 400, 600, 800 and 1 000 mg/kg β-glucan on the basis of basal diet, respectively. After 6 weeks feeding, ammonia chloride was used to conduct a ammonia-nitrogen stress test in each group. The results showed as follows: compared with the control group, the weight gain rate and specific growth rate in the β-glucan supplemental groups were significantly increased (P<0.05), and the feed conversation ratio was significantly decreased (P<0.05), but the condition factor, survival rate and hepatosomatic index had no significant difference (P>0.05). No significant differences were found among all groups in the crude protein, crude lipid, ash and moisture contents of whole body (P>0.05). Dietary β-glucan had no significant effects on serum alanine transaminase activity, and high density lipoprotein, low density lipoprotein, cholesterol, triglycerides and urea nitrogen contents (P>0.05). After 96 h ammonia-nitrogen stress, the cumulative mortality rate in the 400 and 600 mg/kg β-glucan supplemental groups was significantly decreased when compared with the control group (P<0.05). In conclusion, dietary β-glucan can increase the growth performance and anti-ammonia-nitrogen stress ability. Using weight gain rate as a evaluation index, the combination of parabola and broken-line regression analysis shows that the optimal supplemental level of β-glucan in the diet of Japanese seabass is 415.10 mg/kg.

Cite this article

WU Chunyu , CAO Junming , HUANG Yanhua , WANG Guoxia , ZHAO Hongxia , LIU Xiaoling , FU Jingjing , LI Lin . Effects of Dietary β-Glucan on Growth Performance, Body Composition, Serum Biochemical Indices and Anti-Ammonia-Nitrogen Stress Ability of Japanese Seabass (Lateolabrax japonicus)[J]. Chinese Journal of Animal Nutrition, 2013 , 25(12) : 3033 -3040 . DOI: 10.3969/j.issn.1006-267x.2013.12.034

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