Dietary Zinc Source and Level Affect Growth Performance, Tissue Zinc Accumulation and Antioxidative Function of Gibel Carp (Carassius auratus gibelio)

CAO Chunyan; WANG Jia; XUE Min; BHARADWAJ A S; FENG Yun; WU Xiufeng; ZHENG Yinhua; CAO Hong; JI Fengjie; WANG Lubo

doi:10.3969/j.issn.1006-267x.2012.05.024

2012 >Issue 5: 968 - 976

DOI: https://doi.org/10.3969/j.issn.1006-267x.2012.05.024

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Dietary Zinc Source and Level Affect Growth Performance, Tissue Zinc Accumulation and Antioxidative Function of Gibel Carp (Carassius auratus gibelio)

CAO Chunyan ,
WANG Jia ,
XUE Min ,
BHARADWAJ A S ,
FENG Yun ,
WU Xiufeng ,
ZHENG Yinhua ,
CAO Hong ,
JI Fengjie ,
WANG Lubo

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1. Feed Research Institute, The Chinese Academy of Agricultural Sciences, Beijing 100081, China;
2. Novus International, Inc., St. Louis 63304, USA;
3. Aquatic Products Management Department, Beijing Municipal Bureau of Agriculture, Beijing 100029, China

Received date: 2011-11-14

Online published: 2012-04-29

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Abstract

An 8-week growth trial was conducted to study the effects of dietary zinc source and level on growth performance, tissue zinc accumulation and antioxidative function of gibel carp (Carassius auratus gibelio). Fish with initial body weight of (2.73?0.01) g were randomly assigned into 7 treatments with 4 replicates in each treatment and 40 fish per replicate. A basal diet was formulated with white fishmeal and pea protein concentrate as dietary protein sources. Fish in the control group were fed the basal diet. Zinc sulfate (ZnSO₄?7H₂O) was supplemented in the basal diet, and dietary zinc levels amounted to 50 (ZN50 group) and 65 mg/kg (ZN65 group), respectively; Mintrex-Zn (MHA-Zn) was supplemented in the basal diet, and dietary zinc levels amounted to 37.5 (MZN37.5 group), 50 (MZN50 group), 65 (MZN65 group) and 200 mg/kg (MZN200 group), respectively. The results showed as follows: 1) compared with the control group, all the experimental groups showed higher survival rates (P>0.05), weight gain rates and protein efficiencies of fish in low level MHA-Zn groups (groups MZN37.5, MZN50 and MZN65) were significantly lower (P<0.05), however, those in MZN200 group and zinc sulfate groups (groups ZN50 and ZN65) were not significantly changed (P>0.05). 2) Zinc sulfate groups showed an increasing tendency in vertebrae zinc accumulation, and the accumulation in ZN65 group was significantly higher than that in the control group (P<0.05); while MHA-Zn groups showed a Para curve tendency with the increasing of dietary zinc level, the accumulation in MZN65 group was significantly higher than that in ZN65 group (P<0.05); calculated by a quadric regression, the vertebrae zinc accumulation reached the peak when dietary zinc level was 131.3 mg/kg (zinc supplemented as MHA-Zn). 3) Hepatopancreas antioxidative indexes were not significantly affected (P>0.05); alkaline phosphatase (AKP) activity showed a decreasing tendency with the increasing of dietary zinc level in MHA-Zn groups. In conclusion, when zinc content in practical diet satisfies needs for growth of gibel carp, supplemented with more zinc sulfate has no effect on growth performance of gibel carp; when dietary zinc (as MHA-Zn) level increases up to 131.3 mg/kg, vertebrae zinc accumulation reaches the peak.

Key words： gibel carp; MHA-Zn; growth performance; zinc accumulation; antioxidative indexes

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CAO Chunyan , WANG Jia , XUE Min , BHARADWAJ A S , FENG Yun , WU Xiufeng , ZHENG Yinhua , CAO Hong , JI Fengjie , WANG Lubo . Dietary Zinc Source and Level Affect Growth Performance, Tissue Zinc Accumulation and Antioxidative Function of Gibel Carp (Carassius auratus gibelio)[J]. Chinese Journal of Animal Nutrition, 2012 , (5) : 968 -976 . DOI: 10.3969/j.issn.1006-267x.2012.05.024

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