Verification of protein sparing by feeding carbohydrate to common carp Cyprinus carpio

A 9-week feeding trial in floating freshwater cages （1.0 m× 1.0 m×2.0 m） was conducted to study the effects of different dietary levels of protein and starch on growth, body composition, and gene expression of enzymes in common carp, Cyprinus carpio （mean body weight, 36.12±1.18 g） to evaluate the p...

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Bibliographic Details
Published in:Chinese journal of oceanology and limnology 2017-03, Vol.35 (2), p.251-257
Main Author: 程镇燕 李静辉 张宝龙 方珍珍 孙金辉 白东清 孙金生 乔秀亭
Format: Article
Language:English
Subjects:
Aquaculture
Biochemical composition
Biology
Body composition
Body weight
Body weight gain
Cages
Carbohydrates
Carp
Conversion ratio
Corn
Cyprinus carpio
Diet
Earth and Environmental Science
Earth Sciences
Enzymatic activity
Enzyme activity
Feed conversion
Feeding experiments
Fish
Food conversion
Freshwater
Freshwater fishes
Gene expression
Glucokinase
Glucose
Growth rate
Hexokinase
Inland water environment
Lipid composition
Lipids
Marine
Metabolism
Nutrient deficiency
Oceanography
Phosphates
Proteins
Pyruvate kinase
Pyruvic acid
Starch
Vegetables
摄食
玉米淀粉
碳水化合物
葡萄糖激酶
蛋白质效率
饲料转化率
验证
鲤鱼
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Summary:A 9-week feeding trial in floating freshwater cages （1.0 m× 1.0 m×2.0 m） was conducted to study the effects of different dietary levels of protein and starch on growth, body composition, and gene expression of enzymes in common carp, Cyprinus carpio （mean body weight, 36.12±1.18 g） to evaluate the protein-sparing effect of dietary carbohydrate. Four diets were formulated with corn starch as the carbohydrate source to obtain corn starch levels of 6.5%, 13%, 19.5%, or 26% and protein levels of 30.5%, 28.2%, 26.4%, and 24.2%. The results showed no differences in growth performance of fish fed the diets with different protein and corn starch levels, but body composition and glucose metabolic enzyme activity of carp were significantly affected by the different diets （P〈0.05）. Weight gain, specific growth rate, and the feed conversion ratio were not different in fish fed the different dietary treatments. Protein efficiency ratio increased significantly as corn starch level increased （P〈0.05）. Whole-body crude lipid composition increased with increasing dietary corn starch level （P〈0.05）. Glucokinase （GK）, hexokinase, and pyruvate kinase （PK） activities increased significantly with increasing dietary corn starch level （P〈0.05）, whereas glucose-6-phosphate （G6Pase） activity decreased with increasing dietary corn starch level （P〈0.05）. GK gene expression was significantly higher in fish fed the high-corn starch diet than those fed the low-corn starch diet （P〈0.05）. G6pase gene expression tended to decrease with increasing starch level （P〉0.05）. In summary, the results indicate a protein-sparing effect by substituting carbohydrate in the diet of common carp.
ISSN:0254-4059
2096-5508
1993-5005
2523-3521
DOI:10.1007/s00343-016-5332-6