Aquaculture Nutrition

Effects of Dietary Carbohydrate Level on Growth, Body Composition and Digestive Enzyme Activities of Juvenile Peanut Worm, Sipunculus nudus

  • XU Mingzhu ,
  • ZHANG Qin ,
  • TONG Wanping ,
  • DONG Lanfang ,
  • TONG Tong ,
  • CHENG Guangping ,
  • HUANG Guoqiang ,
  • JIANG Yan
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  • 1. College of Animal Science and Technology, Guangxi University, Nanning 530005, China;
    2. Guangxi Institute of Oceanology, Key Laboratory of Marine Biotechnology of Guangxi, Beihai 536000, China

Received date: 2012-09-17

  Online published: 2013-02-28

Abstract

This experiment was conducted to investigate the effects of dietary carbohydrate level on growth, body composition and digestive enzyme activities of juvenile peanut worm, Sipunculus nudus. A total of 7 200 juvenile peanut worm with an average body weight of (15.49?0.03) mg were randomly divided into 6 groups with 3 replicates in each group and 400 worms in each replicate. The worms in the 6 groups were fed isonitrogenous and isoenergetic diets with different carbohydrate levels of 1.89%, 7.35%, 12.81%, 18.27%, 23.73% and 29.19% for 8 weeks. The results showed that the dietary carbohydrate level had no significant effect on survival ratio (P>0.05). With the dietary carbohydrate level increasing, weight gain rate and specific growth rate were significantly increased when dietary carbohydrate level was between 1.89% and 18.27% (P<0.05), and then significantly decreased with dietary carbohydrate further increasing (P<0.05). Dietary carbohydrate level had significant effects on the contents of crude protein and crude lipid in body (P<0.05), but had no significant effects on the contents of moisture and ash in body (P>0.05). With the dietary carbohydrate level increasing, the body crude protein content was firstly increased and then decreased, and when the dietary carbohydrate level was 23.73%, the body crude protein content had the maximum value. There was an upward trend in body crude lipid content with dietary carbohydrate level increasing, and when the dietary carbohydrate level was 29.19%, the body crude lipid content had the maximum value. Dietary carbohydrate level significantly affected protease and amylase activities of juvenile peanut worm (P<0.05). Both protease and amylase activities were firstly increased and then decreased with the dietary carbohydrate level increasing, and they had the maximum values when the dietary carbohydrate levels were 23.75% and 18.27%, respectively. However, dietary carbohydrate level had no significant effect on lipases activity of juvenile peanut worm (P>0.05). The regression model analysis shows that the optimal dietary carbohydrate level which can make juvenile peanut worm acquire the best weight gain rate is 18.52%.

Cite this article

XU Mingzhu , ZHANG Qin , TONG Wanping , DONG Lanfang , TONG Tong , CHENG Guangping , HUANG Guoqiang , JIANG Yan . Effects of Dietary Carbohydrate Level on Growth, Body Composition and Digestive Enzyme Activities of Juvenile Peanut Worm, Sipunculus nudus[J]. Chinese Journal of Animal Nutrition, 2013 , 25(3) : 534 -542 . DOI: 10.3969/j.issn.1006-267x.2013.03.011

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