Effects of Flammulina velutipes Medium Residue on Growth Performance, Intestinal Tissue Structure and Serum Biochemical, Immune and Antioxidant Indexes of Grass Carp

  • ZHU Bo ,
  • ZHONG Lei ,
  • ZHAO Qinghai ,
  • DAI Zhenyan ,
  • CHEN Kaijian ,
  • HU Yi
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  • 1. College of Animal Science and Technology, Hunan Agriculture University, Changsha 410128, China;
    2. Collaborative Innovation Center for Efficient and Health Production of Fisheries in Hunan Province, Changde 415000, China

Received date: 2019-12-03

  Online published: 2020-06-16

Abstract

This experiment was conducted to study the effects of Flammulina velutipes medium residue on growth performance, intestinal tissue structure and serum biochemical, immune and antioxidant indexes of grass carp. A total of 480 grass carp with initial body weight of (20.02±0.03) g were randomly divided into 4 groups with 3 replicates per group and 40 fish per replicate. Fish in the control group were fed a basal diet, and others in the experimental groups were fed equal nitrogen and equal lipid experimental diets which Flammulina velutipes medium residue supplemental levels were 5% (group Ⅰ), 10% (group Ⅱ) and 15% (group Ⅲ), respectively. The experiment lasted for 56 days. The results showed as follows: 1) the weight gain rate of grass carp in group Ⅰ was significantly higher than that in control group and groups Ⅱ and Ⅲ (P<0.05), and there were no significant differences in the feed conversion rate, survival rate, condition factor, hepatosmatic index and viserosomatic index of grass carp among all groups (P>0.05). 2) The activities of amylase and lipase in intestine in group Ⅰ were significantly higher than those in group Ⅲ (P>0.05), and the intestinal trypsin activity in group Ⅱ was significantly higher than that in control group and group Ⅲ (P>0.05). 3) The intestinal villus height and goblet cell number in group Ⅰ were significantly higher than those in the control group (P<0.05), and the intestinal muscle layer thickness in groups Ⅱ and Ⅲ was significantly higher than that in the control group (P<0.05). 4) Compared with the control group, the serum glutamic oxaloacetylase activity in group Ⅰ was significantly decreased (P<0.05), the serum complement 4 content in group Ⅰ was significantly increased (P<0.05), the complement 3, immunoglobulin M contents and alkaline phosphatase activity in serum in groups Ⅱ and Ⅲ were significantly decreased (P<0.05), the serum catalase activity in groups Ⅱ and Ⅲ was significantly decreased (P<0.05), the serum antisuperoxideanion free radical activity in group Ⅲ was significantly decreased (P<0.05), and the serum malondialdehyde content in group Ⅲ was significantly increased (P<0.05). In conclusion, dietary supplemented 5% Flammulina mushroom medium residue can improve the growth performance of grass carp, improve intestinal tissue structure and digestive enzyme activity. It is suggested that the suitable dietary Flammulina mushroom medium residue supplemental level is less than 10% according to the growth performance, intestinal tissue structure and serum biochemical, immune and antioxidant indexes of grass carp.

Cite this article

ZHU Bo , ZHONG Lei , ZHAO Qinghai , DAI Zhenyan , CHEN Kaijian , HU Yi . Effects of Flammulina velutipes Medium Residue on Growth Performance, Intestinal Tissue Structure and Serum Biochemical, Immune and Antioxidant Indexes of Grass Carp[J]. Chinese Journal of Animal Nutrition, 2020 , 32(6) : 2921 -2929 . DOI: 10.3969/j.issn.1006-267x.2020.06.053

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