Effects of Dietary Zinc Content on Growth Performance, Body Composition, Coelomic Fluid Zinc Content and Alkaline Phosphatase Activity of Juvenile Peanut Worm, Sipunculus nudus Linnaeus

XU Mingzhu; ZHANG Qin; TONG Tong; DONG Lanfang; YANG Jialin; JIANG Yan; HUANG Guoqiang

doi:10.3969/j.issn.1006-267x.2016.07.037

2016 , Vol. 28 >Issue 7: 2292 - 2299

DOI: https://doi.org/10.3969/j.issn.1006-267x.2016.07.037

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Effects of Dietary Zinc Content on Growth Performance, Body Composition, Coelomic Fluid Zinc Content and Alkaline Phosphatase Activity of Juvenile Peanut Worm, Sipunculus nudus Linnaeus

XU Mingzhu ,
ZHANG Qin ,
TONG Tong ,
DONG Lanfang ,
YANG Jialin ,
JIANG Yan ,
HUANG Guoqiang

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Guangxi Institute of Oceanology, Key Laboratory of Marine Biotechnology of Guangxi, Beihai 536000, China

Received date: 2016-01-12

Online published: 2016-07-28

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Abstract

This trial was conducted to investigate the effects of dietary zinc content on growth performance, body composition, coelomic fluid zinc content and alkaline phosphatase (AKP) activity of juvenile peanut worm, Sipunculus nudus Linnaeus (S. nudus). Juvenile peanut worm with the average body weight of (14.54±0.10) mg were fed six isonitrogenous and isoenergetic microparticle diets with different supplemental levels of zinc (zinc methionine as zinc source) for 8 weeks, and the measured zinc contents in diets were 9.3, 31.7, 49.9, 90.1, 168.6 and 326.5 mg/kg, respectively. Each diet had three replicates and each replicate had 400 juvenile peanut worm. The results showed that the dietary zinc content had significant effects on weight gain rate (WGR), specific growth rate (SGR) and survival ratio (SR) of S. nudus (P<0.05). When the dietary zinc content was 49.9 mg/kg, WGR and SGR produced the maximum value, and significantly higher than those in the lowest (9.3 mg/kg) and the highest (326.5 mg/kg) zinc content groups (P<0.05). Dietary zinc content had significant effects on body ether extract and ash contents (P<0.05). With the increase of dietary zinc content, body ether extract content was firstly increased and then decreased, while body ash content showed the opposite trend. No significant differences were observed in body moisture and crude protein contents of S. nudus among all groups (P>0.05). Dietary zinc content significantly affected coelomic fluid zinc content and AKP activity of S. nudus (P<0.05). With the increase of dietary zinc content, the coelomic fluid zinc content of S. nudus was sustained rise, when the dietary zinc content was 326.5 mg/kg, it produced the maximum value. Moreover, the coelomic fluid AKP activity was firstly increased and then tended to be stable, when the dietary zinc content was 49.9 mg/kg, it produced the maximum value. With WGR as the evaluating index, the suitable dietary zinc content of juvenile peanut worm is 41.93 mg/kg by regression analysis.

Key words： juvenile peanut worm; zinc; growth performance; body composition; coelomic fluid zinc content; AKP activity

Cite this article

XU Mingzhu , ZHANG Qin , TONG Tong , DONG Lanfang , YANG Jialin , JIANG Yan , HUANG Guoqiang . Effects of Dietary Zinc Content on Growth Performance, Body Composition, Coelomic Fluid Zinc Content and Alkaline Phosphatase Activity of Juvenile Peanut Worm, Sipunculus nudus Linnaeus[J]. Chinese Journal of Animal Nutrition, 2016 , 28(7) : 2292 -2299 . DOI: 10.3969/j.issn.1006-267x.2016.07.037

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