RESEARCH PAPER

Effects of Dietary Vitamin A Level on Growth Performance, Serum Biochemical Indices and Tissue Digestive Enzyme Activities of Monopterus albus

  • HU Zhonghua ,
  • ZHANG Wenping ,
  • ZHOU Qiubai ,
  • HUO Huanhuan ,
  • WANG Zirui ,
  • YANG Zhuqing ,
  • WAN Xinsheng
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  • 1. College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang 330045, China;
    2. Key Laboratory for Nutritional Physiology and Healthy Breeding of Characteristic Aquatic Life, Nanchang 330045, China;
    3. Sichuan New Hope Liuhe Technology Innovation Co., Ltd., Chengdu 610100, China

Received date: 2021-11-04

  Online published: 2022-05-14

Abstract

This experiment was conducted to study the dietary vitamin A requirement of Monopterus albus in order to provide theoretical basis for the preparation of artificial compound feed for M. albus. A total of 1 260 young M. albus with an average body mass of (7.32±0.02) g were randomly divided into 7 groups, with 4 replicates in each group,and 45 M.albus in each replicate. The M. albus seedlings were fed 7 isonitrogenous and isoenergetic diets with different vitamin A levels (measured values:3 201, 3 620, 4 010, 4 730, 6 510, 9 720 and 16 890 IU/kg, labeled L1 to L7), and the experiment lasted for 70 days. Results showed as follows:final average weight (FBW), weight gain rate (WGR) and specific growth rate (SGR) of M. albus increased first and then decreased with the increase of dietary vitamin A level, FBW, WGR and SGR in L2, L3 and L4 groups were significantly higher than those in L1 and L7 groups (P<0.05). With the increase of vitamin A level, the activities of glutamic oxalacetic transaminase (GOT) and alanine aminotransferase (GPT) in serum of M. albus were firstly decreased and then increased, and the activities in the L4 group were significantly lower than those in L1 and L7 groups (P<0.05). The contents of serum triglyceride (TG) and total cholesterol (T-CHO)were significantly different (P<0.05), and the content in L5 group was the highest. The contents of liver TG and T-CHO in L3 to L5 groups decreased significantly (P<0.05). The content of serum glucose (GLU) in L3 to L5 groups was significantly higher than that in other groups (P<0.05), and the content of serum GLU in L7 group was the lowest. The protease and lipase activities increased firstly and then decreased with the dietary vitamin A level increasing, and the protease activities in hepatopancreas, stomach and foregut in the L3 group were the highest, the lipase activities in stomach lipase in L3 group were the highest, and the lipase activities in hepatopancreas and foregut in L5 group were the highest. Appropriate vitamin A level in diets can improve the activities of protease and lipase of M. albus and promote the growth of M. albus. The optimal level of vitamin A is 3 810.43 IU/kg by cracked line analysis of the relationship between vitamin A level and WGR.

Cite this article

HU Zhonghua , ZHANG Wenping , ZHOU Qiubai , HUO Huanhuan , WANG Zirui , YANG Zhuqing , WAN Xinsheng . Effects of Dietary Vitamin A Level on Growth Performance, Serum Biochemical Indices and Tissue Digestive Enzyme Activities of Monopterus albus[J]. Chinese Journal of Animal Nutrition, 2022 , 34(5) : 3208 -3219 . DOI: 10.3969/j.issn.1006-267x.2022.05.047

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