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Front. Vet. Sci. | doi: 10.3389/fvets.2019.00165

Effects of Dietary Carbohydrate and Lipid Levels on Growth Performance, Feed Utilization, and Nutrient Metabolism in Two Strains of Gibel Carp

 Hongyan Li1,  Wenjie Xu1,  Junyan Jin1*, Xiaoming Zhu1, Yunxia Yang1, Dong Han1, Haokun Liu1 and  Shouqi Xie1
  • 1Institute of Hydrobiology, Chinese Academy of Sciences, China

To test the hypothesis that effects of dietary carbohydrate and lipid concentrations on growth performance, feeding utilization, glucose and lipid metabolism in gibel carp A strain may be differ from F strain, these two strain of gibel carp were fed with one of three different isonitrogenous diets: HCLL (45% carbohydrate, 2% lipid), MCML (30% carbohydrate, 8% lipid), or LCHL (15% carbohydrate, 14% lipid). After 8 weeks, the HCLL-fed fish had the highest hepatosomatic index, hepatic crude lipid levels, and triglyceride levels and lipid retention efficiency. Enhanced lipogenesis and lipid uptake potential were observed in fish fed HCLL and MCML diets. Moreover, increases in glucose transport (glut2, P = 0.003) and glycolysis (gk, P = 0.012; 6pfk, P = 0.005) in livers of both strains were induced by the high-carbohydrate diet. Genotype-specific effect was identified on plasma lipid content. Plasma triglyceride levels were also greater in the F strain than in the A strain. Furthermore, the F strain had higher levels of fatty acid β-oxidation and glycolysis compared with the A strain. Nutrient retention was affected (P < 0.05) by the interaction between genotype and diet, implied dietary carbohydrate played a vital role in lipid accumulation in gibel carp. As dietary lipids increased, the F strain exhibited better feed utilization and a higher PRE than the A strain. However, the A strain had better growth performance. Overall, the F strain had better glucose uptake, glycolysis potential, and lipid utilization ability than the A strain.

Keywords: carbohydrate, Lipid, Nutrient metabolism, Gibel carp, Strain

Received: 08 Mar 2019; Accepted: 13 May 2019.

Edited by:

Alex V. Chaves, University of Sydney, Australia

Reviewed by:

Zhen-Yu Du, East China Normal University, China
Simon J. Davies, Harper Adams University, United Kingdom
Mauro Vasconi, Council for Agricultural and Economics Research, Italy  

Copyright: © 2019 Li, Xu, Jin, Zhu, Yang, Han, Liu and Xie. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Dr. Junyan Jin, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei Province, China, jinjunyan@ihb.ac.cn