AQUACULTURE NUTRITION

Effects of Different Dietary Vitamin D Contents on Growth Performance, Calcium and Phosphorus Metabolism of Juvenile Japanese Seabass (Lateolabrax japonicas)

  • ZHANG Lu ,
  • LI Jing ,
  • MAI Kangsen ,
  • AI Qinghui ,
  • ZHANG Chunxiao ,
  • LI Huitao ,
  • YUAN Yuhui
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  • 1. The Key Laboratory of Mariculture, Education Ministry of China, Fishery College, Ocean University of China, Qingdao 266003, China;
    2. Technology Center of Tongwei Co., Ltd., Chengdu 610041, China;
    3. Center for Bioengineering and Biotechnology, China University of Petroleum(East China), Qingdao 266580, China

Received date: 2015-11-13

  Online published: 2016-05-24

Abstract

A 9-week feeding experiment was conducted to evaluate the effects of different dietary vitamin D contents on growth performance, calcium and phosphorus metabolism of juvenile Japanese seabass (Lateolabrax japonicas). Juvenile Japanese seabass with the initial body weight of (2.26±0.03) g as the experimental animal, and were randomly divided into 6 groups with 3 replicates each group and 15 fish per replicate. Fish in the 6 groups were fed six isonitrogenous and isoenergentic diets with the measured contents of vitamin D were 34.2, 219.4, 393.8, 775.9, 1534.1 and 3091.2 IU/kg, respectively. The results showed as follows:1) weight gain rare (WGR) was significantly increased with increasing dietary vitamin D content from 34.2 to 393.8 IU/kg (P<0.05), and when the dietary vitamin D content more than 393.8 IU/kg, the WGR had no significant change and presented a trend of forgetting (P>0.05). Special growth rate (SGR), feed efficiency ratio (FER) and protein efficiency ratio (PER) showed a similar tendency to WGR. 2) Dietary vitamin D content significantly influenced the contents of ash, calcium and phosphorus in carcass, ash in vertebra, operculum and scale, and calcium and phosphorus in vertebra of juvenile Japanese seabass (P<0.05), but had no significant influences on the contents of crude protein, crude lipid and moisture in carcass (P>0.05). 3) Serum alkaline phosphatase (AKP) activity, and hydroxyproline (HPro), calcium ion (Ca2+) and inorganic phosphorus (Pi) contents were all significantly affected by dietary vitamin D content (P<0.05). 4) Dietary vitamin D content had significant influences on hepatosomatic index, liver lipid and vitamin D contents (P<0.05). Liver vitamin D content showed an increased trend with increasing dietary vitamin D content, and it changed to be steady when dietary vitamin D content up to 1534.1 IU/kg. Broken-line model analysis with the WGR as the appraising index shows that juvenile Japanese seabass require 431.0 IU/kg diet vitamin D for maximal growth. Base on the quadratic curve model analysis with the liver vitamin D content as the appraising index, juvenile Japanese seabass require 2444.4 IU/kg diet vitamin D for maximal liver vitamin D deposition.

Cite this article

ZHANG Lu , LI Jing , MAI Kangsen , AI Qinghui , ZHANG Chunxiao , LI Huitao , YUAN Yuhui . Effects of Different Dietary Vitamin D Contents on Growth Performance, Calcium and Phosphorus Metabolism of Juvenile Japanese Seabass (Lateolabrax japonicas)[J]. Chinese Journal of Animal Nutrition, 2016 , 28(5) : 1402 -1411 . DOI: 10.3969/j.issn.1006-267x.2016.05.016

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