Effects of Different Zinc Sources on Growth Performance, Serum Biochemical Indices and Trace Element Contents in Serum and Hepatopancreas of Genetic Improvement of Farmed Tilapia

FU Zhihuan; LIN Xue; SHU Xugang; QIU Guixiong; TIAN Yunbo; CHEN Mingzhu

doi:10.3969/j.issn.1006-267x.2019.08.030

2019 , Vol. 31 >Issue 8: 3690 - 3698

DOI: https://doi.org/10.3969/j.issn.1006-267x.2019.08.030

Effects of Different Zinc Sources on Growth Performance, Serum Biochemical Indices and Trace Element Contents in Serum and Hepatopancreas of Genetic Improvement of Farmed Tilapia

FU Zhihuan ,
LIN Xue ,
SHU Xugang ,
QIU Guixiong ,
TIAN Yunbo ,
CHEN Mingzhu

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1. College of Animal Science and Technology, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China;
2. Guangzhou Tanke Biotechnology Co., Ltd., Guangzhou 510896, China

Received date: 2019-01-14

Online published: 2019-08-19

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Abstract

The purpose of this experiment was to study the effects of different zinc sources[zinc sulfate monohydrate (ZnSO₄), zinc glycinate (Zn-Gly) and (enteric-type Zn-Gly) on the growth performance, antioxidant capacity, fat metabolism and antioxidant related trace elements copper, iron, manganese and zinc contents in serum and hepatopancreas of genetic improvement of farmed tilapia (GIFT). A total of 240 GIFT with the initial body weight of (47.54±0.84) g were randomly divided into 4 groups with 3 replicates per group and 20 tilapia per replicate. Tilapia in control group were fed a basal feed (zinc content was 72.22 mg/kg), and those in experimental groups were fed the basal diet supplemented with 40 mg/kg (as zinc) of enteric-type Zn-Gly, Zn-Gly and ZnSO₄, respectively. The experiment lasted for 40 days. The results showed that, compared with the control group and the ZnSO₄ group, the supplementation of enteric-type Zn-Gly could not only significantly enhance the weight gain rate (WGR) and protein efficiency ratio (PER) (P<0.05), but also could significantly reduce the hepatosomatic index (HSI) and the feed conversion rate (FCR) (P<0.05); the FCR of the Zn-Gly group was significantly decreased (P<0.05), and the PER was significantly increased (P<0.05). Serum superoxide dismutase (SOD) and alkaline phosphatase (AKP) activities were not significantly affected by different zinc sources (P>0.05). However, serum malondialdehyde (MAD) content of the enteric-type Zn-Gly group and the Zn-Gly group was significantly lower than that of the control group (P<0.05). The serum total cholesterol (T-CHO) content of the enteric-type Zn-Gly group was significantly higher than that of the other groups (P<0.05), and the triglyceride (TG) content was significantly higher than that of the control group and the ZnSO₄ group (P<0.05). There were no significant effects in the contents of copper, iron and manganese in serum of each group (P>0.05). When compared with the control group and ZnSO₄ group, the supplementation of enteric-type Zn-Gly significantly increased the zinc content in serum and hepatopancreas (P<0.05). The results suggested that diets supplemented with enteric-type Zn-Gly can significantly improve the growth performance of GIFT, increase the antioxidant capacity, promote fat metabolism, and increase the zinc content in serum and hepatopancreas. Moreover, the enteric-type Zn-Gly may be better than Zn-Gly on the growth-promoting.

Key words： zinc source; enteric-type; genetic improvement of farmed tilapia; growth performance; antioxidant capacity; fat metabolism; trace elements

Cite this article

FU Zhihuan , LIN Xue , SHU Xugang , QIU Guixiong , TIAN Yunbo , CHEN Mingzhu . Effects of Different Zinc Sources on Growth Performance, Serum Biochemical Indices and Trace Element Contents in Serum and Hepatopancreas of Genetic Improvement of Farmed Tilapia[J]. Chinese Journal of Animal Nutrition, 2019 , 31(8) : 3690 -3698 . DOI: 10.3969/j.issn.1006-267x.2019.08.030

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