Molecular Nutrition

Effects of Dietary Taurine Level on Growth Performance and Body Composition of Juvenile Grouper (Epinephelus coioides) at Different Growth Periods

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  • Xiamen Key Laboratory for Feed Quality Testing and Safety Evaluation, Fisheries College of Jimei University, Xiamen 361021, China

Received date: 2016-11-15

  Online published: 2017-05-13

Abstract

A feeding trial was conducted to investigate the effects of dietary taurine level on growth performance and body composition of juvenile grouper (Epinephelus coioides) at different growth periods. Four experimental diets were formulated to contain 0 (D1), 0.5% (D2), 1.0% (D3) and 1.5% (D4) taurine based on casein and gelatin as protein sources. Juvenile grouper with the initial body weight of (13.85±0.25) g were allocated to 4 groups and each group had 4 aquariums (the volume of 120 L) at a stock density of 25 fish per aquarium. The fish were fed to satiation twice daily over a 84-day feeding period, which was divided into three sub-periods: day 1 to 28 (the 1st growth period), day 29 to 56 (the 2nd growth period) and day 57 to 84 (the 3rd growth period). Fish were weighted and sampled on day 28, 56 and 84, respectively. The results showed as follows: the weight gain ratio (WGR), specific growth rate (SGR), feeding rate (FR) and feed efficiency (FE) of fish in taurine groups (D2, D3 and D4 groups) were significantly higher than those of fish in non-taurine group (D1 group) at each growth period (P<0.05), and the fish in D3 group had significantly higher WGR compared with other groups expect D4 group at the 3rd growth period (P<0.05). Moreover, the WGR, SGR, FR and FE of fish at the 1st growth period were significantly higher than those of fish at the 2nd and 3rd growth periods at the same dietary taurine level (P<0.05). When feeding on day 28, 56 and 84, the hepatosomatic index (HSI) and viscerasomatic index (VSI) of fish in taurine groups were significantly lower than those of fish in non-taurine group (P<0.05), but no significant difference was found in condition factor (CF) compared with non-taurine group (P>0.05). However, significantly lower HSI and VSI of fish were observed on day 56 and 84 compared with on day 28 at the same dietary taurine level (P<0.05). The whole-body crude protein content was significantly higher, but crude lipid content was significantly lower of fish fed taurine-containing diets than those of fish fed non-taurine diet on day 84 (P<0.05). The above results indicate that appropriate dietary taurine level will be beneficial to the growth of juvenile grouper, and excess or deficient taurine supplementation will have the opposite effect. Addition of taurine in diets can reduce the lipid deposition but elevate protein deposition of juvenile grouper body at the same time. The appropriate dietary levels calculated base on WGR as the evaluation index at three growth periods are 1.20% (the 1st growth period), 1. 08% (the 2nd growth period) and 1.00% (the 3rd growth period), respectively, and this result indicates that the requirement of taurine will decline with fish age.

Cite this article

WANG Xuexi, ZHOU Mingwen, HUANG Yan, WANG Kun, YE Jidan . Effects of Dietary Taurine Level on Growth Performance and Body Composition of Juvenile Grouper (Epinephelus coioides) at Different Growth Periods[J]. Chinese Journal of Animal Nutrition, 2017 , 29(5) : 1810 -1820 . DOI: 10.3969/j.issn.1006-267x.2017.05.042

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