Effects of &alpha;-Ketoglutarate Supplementation in Different Protein Level Diets on Growth Performance, Body Composition and Serum Biochemical Indices of Songpu Mirror Carp

WEI Yingying; XU Qiyou; LI Jinnan; WANG Chang; LUO Liang; ZHAO Zhigang

doi:10.3969/j.issn.1006-267x.2013.12.024

2013 , Vol. 25 >Issue 12: 2958 - 2965

DOI: https://doi.org/10.3969/j.issn.1006-267x.2013.12.024

Feed Science and Technology

Effects of α-Ketoglutarate Supplementation in Different Protein Level Diets on Growth Performance, Body Composition and Serum Biochemical Indices of Songpu Mirror Carp

WEI Yingying ,
XU Qiyou ,
LI Jinnan ,
WANG Chang ,
LUO Liang ,
ZHAO Zhigang

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1. College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China;
2. Laboratory of Animal Nutrition, Heilongjiang Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China

Received date: 2013-07-01

Online published: 2013-11-19

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Abstract

This experiment was aimed to study the effects of α-ketoglutarate (AKG) supplementation in different protein level diets on growth performance, body composition and serum biochemical indices of Songpu mirror carp. Four protein levels (28%, 31%, 34% and 37%, respectively) were designed in the experiment, and 3 AKG concentrations were designed under each protein level. A total of 720 Songpu mirror carp with an average body weight of (61.28±3.40) g were divided into 12 groups with 3 replicates per group and 20 fish per replicate. The experiment lasted for 8 weeks. The results showed as follows: under each protein level, AKG supplementation showed a tendency to increase weight gain rate (WGR) and protein efficiency ratio (PER) and decrease feed conversion ratio (FCR) of Songpu mirror carp, but the differences were not significant (P>0.05) except the WGR under the 34% protein level (P<0.05). AKG supplementation had no significant effects on hepatosomatic index (HSI), visceralsomatic index (VSI) and condition factor (CF) under each protein level (P>0.05). Under the 28% protein level, the serum triglyceride (TG) content in 1.50%AKG group was significantly lower than that in control group (P<0.05), but there was no significant difference between 0.75% and 1.50%AKG groups (P>0.05). Under the 31% protein level, the serum albumin (ALB) content and alanine aminotransferase (ALT) activity in 1.50%AKG group were significantly higher than those in other groups (P>0.05); the serum uric acid (UA) and TG contents in 0.75% and 1.50%AKG groups were significantly lower than those in control group (P<0.05). Under the 34% protein level, the serum total protein (TP) and TG contents in 0.75%AKG group were significantly higher than those in control group (P<0.05). Under the 37% protein level, the serum ALT activity and UA content in 1.50%AKG group were significantly higher than those in other groups (P<0.05); the serum aspartate aminotransferase (AST) activity in 0.75% and 1.50%AKG groups was significantly higher than that in control group (P<0.05). AKG supplementation had no significant effects on serum globulin (GLB), cholesterol (TCHO) and creatinine (CREA) contents and alkaline phosphatase (ALP) activity under each protein level (P>0.05). The interaction of the protein level and AKG concentration had significant effects on whole fish ash and serum UA and TG contents (P<0.05), and had no significant effects on other body composition indices and serum biochemical indices (P>0.05). It is concluded that suitable supplementation of AKG in diets can improve WGR and PER, reduce FCR, and promote protein and fat metabolism of Songpu mirror carp to some extent.

Key words： α-ketoglutarate; Songpu mirror carp; growth performance; body composition; serum biochemical indices

Cite this article

WEI Yingying , XU Qiyou , LI Jinnan , WANG Chang , LUO Liang , ZHAO Zhigang . Effects of α-Ketoglutarate Supplementation in Different Protein Level Diets on Growth Performance, Body Composition and Serum Biochemical Indices of Songpu Mirror Carp[J]. Chinese Journal of Animal Nutrition, 2013 , 25(12) : 2958 -2965 . DOI: 10.3969/j.issn.1006-267x.2013.12.024

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