AQUACULTURE NUTRITION

Effects of Dietary β-Glucan on Growth Performance, Serum Biochemical Indices and Resistance Against Aeromonas hydrophila of Juvenile Yellow Catfish(Pseudobagrus fulvidraco)

  • LI Yongjuan ,
  • WANG Weimin ,
  • HUANG Yanhua ,
  • CAO Junming ,
  • WANG Guoxia ,
  • ZHAO Hongxia ,
  • LIU Shaoyu ,
  • MA Yongping
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  • 1. Institute of Animal Science, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China;
    2. College of Fisheries, Huazhong Agricultural University, Wuhan 430070, 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: 2015-06-24

  Online published: 2015-12-14

Abstract

A 42 days feeding trial was conducted to study the effects of dietary β-glucan on growth performance, serum biochemical indices and resistance against Aeromonas hydrophila of juvenile yellow catfish(Pseudobagrus fulvidraco). A basal diet was supplemented with 200, 600 and 1000 mg/kg β-glucan to prepare three test diets. Seven hundred and twenty fish with an initial body weight of(1.53±0.04) g were selected and randomly divided into 7 groups, including feeding with basal diet as control group(G0 group), continuous feeding with diets of different levels of β-glucan(SG200, SG600 and SG1000 groups), and interval feeding with diets of different levels of β-glucan for 7 days followed by the basal diet for 7 days(IG200, IG600 and IG1000 groups). The continuous feeding groups had 4 replicates, and control group and interval feeding groups all had 3 replicates, and each replicate had 30 fish. After the feeding trail, the fish were challenged with Aeromonas hydrophila for 96 h to calculate the accumulative mortality rate(AMR). The results showed as follows:1) there were no significant differences in weight gain rate(WGR), feed conversion ratio(FCR), protein efficiency ratio(PER) and survival rate(SR) among 7 groups(P>0.05), but hepatosomatic index(HSI) in IG1000 group was significantly lower than that in control group(P<0.05). Furthermore, the fish fed diets supplemented with β-glucan showed higher WGR and PER than the control group, and continuous fed diet supplemented with β-glucan showed higher WGR than interval fed diet supplemented with the same level of β-glucan, the highest values appeared in SG600 group. 2)Compared with the control group, the contents of crude protein, ether extract and ash of whole body in the other six groups were increased to some extent and the moisture content was decreased to some extend, but no significant differences were observed(P>0.05). 3) There were no significant differences in serum biochemical indices among all groups(P>0.05). However, compared with the control group, the contents of serum globulin(GLB) and total protein(TP) in SG1000 and IG600 group were higher, but the activities of serum glutamic oxalacetic transaminase(GOT) and glutamic pyruvic transaminase(GPT) in β-glucan supplementation groups were lower. 4) After Aeromonas hydrophila infection for 96 h, the AMR was 35% to 46% among all groups and there was no significant difference(P>0.05). In conclusion, except for HSI of interval feeding 1000 mg/kg β-glucan is significantly decreased, supplementation of 200, 600 and 1000 mg/kg β-glucan to diets, using either continuous or interval feeding strategies, has no significant effects on growth performance, body composition, serum biochemical indices and resistance against Aeromonas hydrophila of juvenile yellow catfish.

Cite this article

LI Yongjuan , WANG Weimin , HUANG Yanhua , CAO Junming , WANG Guoxia , ZHAO Hongxia , LIU Shaoyu , MA Yongping . Effects of Dietary β-Glucan on Growth Performance, Serum Biochemical Indices and Resistance Against Aeromonas hydrophila of Juvenile Yellow Catfish(Pseudobagrus fulvidraco)[J]. Chinese Journal of Animal Nutrition, 2015 , 27(12) : 3754 -3762 . DOI: 10.3969/j.issn.1006-267x.2015.12.014

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