Molecular Nutrition

Effects of Dietary Cassava Starch Supplemental Level on Growth Performance, Digestive Ability and Glycometabolism of Common Carp

  • FAN Ze ,
  • LI Jinghui ,
  • WANG Anqi ,
  • SUN Jinhui ,
  • CHENG Zhenyan ,
  • BAI Dongqing ,
  • QIAO Xiuting
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  • Tianjin Key Lab of Aqua-Ecology and Aquaculture, College of Fisheries, Tianjin Agricultural University, Tianjin 300384, China

Received date: 2016-06-14

  Online published: 2016-12-17

Abstract

An 8-week feeding experiment was conducted to study the effects of dietary cassava starch supplemental level on growth performance, digestive ability and glycometabolism of common carp, in order to investigate the feasibility of replacement of fish meal with cassava starch in diets for common carp. Three isolipidic (crude lipid content was about 6.7%) and isoenergetic (gross energy was about 16 MJ/kg) experimental diets were formulated with 5%, 10% and 20% cassava starch on basis of practical diet formulation, respectively. Common carp with the average body weight of (55.73±3.55) g were randomly allocated to 3 groups with 3 replicates per group and 50 fish per replicate, and the fish in the 3 groups were randomly fed one of three diets. The results showed as follows:the highest values of weight gain rate (WGR), specific growth rate (SGR), protein efficient ratio (PER) and condition factor (CF) were observed in the 20% cassava starch group and they were significantly higher than those in the 5% cassava starch group (P<0.05); the lowest value of hepatosomatic index (HSI) was observed in the 20% cassava starch group and it was significantly lower than that in the 5% cassava starch group (P<0.05). With the cassava starch supplemental level increasing, the intestinal protease activity showed a decrease trend, and 5% cassava starch group was significantly higher than 20% cassava starch group (P<0.05). The intestinal lipase activity in 10% cassava starch group was significantly higher than that in 5% and 20% cassava starch groups (P<0.05). The intestinal amylase activity in 10% cassava starch group was significantly higher than that in 20% cassava starch group (P<0.05). With the cassava starch supplemental level increasing, serum aspartate aminotransferase (AST)/alanine aminotransferase (ALT) and the contents of triglyceride and total cholesterol all showed a decrease tend, while the contents of serum total protein and high density lipoprotein cholesferol all showed an increase trend. The activities of hepatopancreas AST and ALT were increased with the cassava starch supplemental level increasing, and the hepatopancreas AST activity in 20% cassava starch group was significantly higher than that in 5% cassava starch group (P<0.05). With the cassava starch supplemental level increasing, the activities of hepatopancreas phosphofructokinase-1 (PFK-1) and pyruvatekinase (PK) all showed an increase trend, and 20% cassava starch group was significantly higher than 5% cassava starch group (P<0.05). The activity of hepatopancreas glucose-6-phosphatase (G6Pase) in 20% cassava starch group was significantly higher than that in 5% and 10% cassava starch groups (P<0.05), while the activity of hepatopancreas phosphoenolpyruvate (PEPCK) in 10% cassava starch group was significantly higher than that in 5% and 20% cassava starch groups (P<0.05). Combined the results of this study and the cost of feed production, supplementing 10% to 20% cassava starch in the diet can meet the requirements for growth, hepatic function and digestive capacity of common carp, and can effectively adjust the glycolysis and gluconeogenic key enzyme activities.

Cite this article

FAN Ze , LI Jinghui , WANG Anqi , SUN Jinhui , CHENG Zhenyan , BAI Dongqing , QIAO Xiuting . Effects of Dietary Cassava Starch Supplemental Level on Growth Performance, Digestive Ability and Glycometabolism of Common Carp[J]. Chinese Journal of Animal Nutrition, 2016 , 28(12) : 4044 -4053 . DOI: 10.3969/j.issn.1006-267x.2016.12.040

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