Effects of Different Dietary Carbohydrate-to-Lipid Ratios on Growth, Body Composition and Digestive Enzyme Activities of Common Carp (Cyprinus carpoio)

QU Mu; LI Chang'e; LIU Hongchao; ZHANG Baolong; CHENG Zhenyan; SUN Jinhui; BAI Dongqing; QIAO Xiuting

doi:10.3969/j.issn.1006-267x.2016.07.011

2016 , Vol. 28 >Issue 7: 2069 - 2078

DOI: https://doi.org/10.3969/j.issn.1006-267x.2016.07.011

AQUACULTURE NUTRITION

Effects of Different Dietary Carbohydrate-to-Lipid Ratios on Growth, Body Composition and Digestive Enzyme Activities of Common Carp (Cyprinus carpoio)

QU Mu ,
LI Chang'e ,
LIU Hongchao ,
ZHANG Baolong ,
CHENG Zhenyan ,
SUN Jinhui ,
BAI Dongqing ,
QIAO Xiuting

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1. College of Fisheries, Tianjin Agricultural University, Tianjin Key Lab of Aqua-Ecology and Aquaculture, Tianjin 300384, China;
2. Animal Husbandry and Fishery Service Center, Tianjin 301770;
3. Tianjin Chenhui Feed Co., Ltd., Tianjin 301800, China

Received date: 2016-01-06

Online published: 2016-07-28

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Abstract

This study determined the effects of different dietary carbohydrate-to-lipid ratios on growth, body composition and digestive enzyme activities of common carp (Cyprinus carpoio). Common carp with the average body weight of (44.45±1.60) g were randomly divided into 5 groups with 3 replicates in each group and 70 fish in each replicate. The fish in those groups were fed 5 different experimental diets with the carbohydrate-to-lipid ratios of 5.2, 6.8, 9.6, 15.0 and 27.7, respectively. The growth experiment lasted for 63 d. The results showed as follows: 1) the maximum weight gain ratio (WGR), specific growth rate (SGR) and the minimum feed conversion rate (FCR) were observed in common carp fed the diet with 6.8 carbohydrate-to-lipid ratio, and the WGR and SGR in 6.8 carbohydrate-to-lipid ratio group were significantly higher than those in other groups (P<0.05), while the FCR in 27.7 carbohydrate-to-lipid ratio group was significantly higher than that in 5.2 to 15.0 carbohydrate-to-lipid ratio groups (P<0.05). The protein efficiency ratio (PER) in 27.7 carbohydrate-to-lipid ratio group was significantly lower than that in other groups (P<0.05), but the condition factor (CF) was significantly higher than that in 6.8 carbohydrate-to-lipid ratio group (P<0.05). 2) The crude lipid content of whole body and dorsal muscle in 5.2 and 27.7 carbohydrate-to-lipid ratio groups was higher, and significantly higher than that in other groups (P<0.05); the ash content of dorsal muscle in 15.0 carbohydrate-to-lipid ratio group had the lowest value, and significantly lower than that in 5.2 carbohydrate-to-lipid ratio group (P<0.05), while there were no significant differences among other groups (P>0.05). 3) With the increase of diary carbohydrate-to-lipid ratio, serum total cholesterol content was firstly decreased and then increased, and the lowest value was found in 15.0 carbohydrate-to-lipid ratio group which was significantly higher than that in 5.2 and 27.7 carbohydrate-to-lipid ratio groups (P<0.05); the highest serum triglyceride content was found in 6.8 carbohydrate-to-lipid ratio group, and significantly higher than that in other groups (P<0.05); the highest serum glucose content was found in 27.7 carbohydrate-to-lipid ratio group, and significantly higher than that in other groups (P<0.05); the highest liver glycogen content was found in 27.7 carbohydrate-to-lipid ratio group, and significantly higher than that in other groups except 15.0 carbohydrate-to-lipid ratio group (P<0.05). 4) The highest hepatopancreas and midgut protease activities were found in 27.7 carbohydrate-to-lipid ratio group, and significantly higher than those in other groups (P<0.05); when dietary carbohydrate-to-lipid ratio was 15.0, the foregut protease activity was significantly decreased compared with other groups (P<0.05). The highest hepatopancreas and foregut amylase activities were found in 15.0 carbohydrate-to-lipid ratio group; the midgut amylase activity reduced with the dietary carbohydrate-to-lipid ratio increasing, and the 27.2 carbohydrate-to-lipid ratio group was significantly lower than that in other groups (P<0.05); the hindgut amylase activity in 15.0 carbohydrate-to-lipid ratio group had the lowest value, and significantly lower than that in other groups except 9.6 carbohydrate-to-lipid ratio group (P<0.05). Lipase activity in all organizations showed the same trend, which raised first and then went down and got the highest values at 15.0 carbohydrate-to-lipid ratio. Considered the growth, body composition, serum biochemical indices and digestive enzyme activities, the optimal dietary carbohydrate-to-lipid ratio of common carp is 6.8 to 15.0.

Key words： common carp (Cyprinus carpoio); carbohydrate-to-lipid ratio; growth performance; body composition; digestive enzyme activities

Cite this article

QU Mu , LI Chang'e , LIU Hongchao , ZHANG Baolong , CHENG Zhenyan , SUN Jinhui , BAI Dongqing , QIAO Xiuting . Effects of Different Dietary Carbohydrate-to-Lipid Ratios on Growth, Body Composition and Digestive Enzyme Activities of Common Carp (Cyprinus carpoio)[J]. Chinese Journal of Animal Nutrition, 2016 , 28(7) : 2069 -2078 . DOI: 10.3969/j.issn.1006-267x.2016.07.011

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