Effects of Dietary Carbohydrate to Lipid Ratio on Growth Performance, Body Composition and Serum Biochemical Indices of Genetic Improvement of Farmed Tilapia in Growth Mid-Stage

  • WU Fan ,
  • TIAN Juan ,
  • YU Lijuan ,
  • JIANG Ming ,
  • LIU Wei ,
  • LU Xing ,
  • WEN Hua
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  • Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China

Received date: 2020-06-13

  Online published: 2020-12-07

Abstract

The object of this experiment was to evaluate the effects of dietary carbohydrate to lipid ratio on growth performance, body composition and serum biochemical indices of genetic improvement of farmed tilapia in growth mid-stage. The carbohydrate to lipid ratios in 6 isonitrogenous and isoenergetic experimental diets were 1.59, 2.41, 3.68, 5.72, 10.16 and 22.79, respectively. Genetic improvement of farmed tilapia with an average body weight of (79.76±1.93) g were randomly divided into 6 groups with 3 replicates in each group and 20 fish in each replicate. The experiment lasted for 56 days. The results showed as follows: 1) the weight gain rate and specific growth rate of carbohydrate to lipid ratio of 3.68, 5.72 and 10.16 groups were significantly higher than those of carbohydrate to lipid ratio of 1.59, 2.41 and 22.79 groups (P<0.05). The feed efficiency of carbohydrate to lipid ratio of 3.68 and 5.72 groups was significantly higher than that of carbohydrate to lipid ratio of 1.59, 2.41, 10.16 and 22.79 groups (P<0.05). The viscerosomatic index, hepatosomatic index and mesenteric fat index of carbohydrate to lipid ratio of 22.79 group were significantly lower than those of carbohydrate to lipid ratio of 1.59, 2.41, 3.68 and 5.72 groups (P<0.05). 2) The whole body crude lipid content of carbohydrate to lipid ratio of 22.79 group was significantly lower than that of carbohydrate to lipid ratio of 1.59, 2.41, 3.68 and 5.72 groups (P<0.05). The liver crude protein content of carbohydrate to lipid ratio of 22.79 group was significantly higher than that of carbohydrate to lipid ratio of 1.59, 2.41, 3.68 and 5.72 groups (P<0.05). The liver crude lipid content of carbohydrate to lipid ratio of 22.79 group was significantly lower than that of carbohydrate to lipid ratio of 1.59, 2.41 and 3.68 groups (P<0.05). The liver crude glycogen content of carbohydrate to lipid ratio of 22.79 group was significantly higher than that of carbohydrate to lipid ratio of 1.59, 2.41, 3.68, 5.72 and 10.16 groups (P<0.05). 3) The serum total cholesterol content of carbohydrate to lipid ratio of 10.16 and 22.79 groups was significantly lower than that of carbohydrate to lipid ratio of 1.59 and 2.41 groups (P<0.05). The serum triglyceride content and alkaline phosphatase activity of carbohydrate to lipid ratio of 22.79 group were significantly lower than that of carbohydrate to lipid ratio of 1.59, 2.41, 3.68 and 5.72 groups (P<0.05). The serum glucose content of carbohydrate to lipid ratio of 22.79 group was significantly higher than that of carbohydrate to lipid ratio of 1.59, 2.41, 3.68, 5.72 and 10.16 groups (P<0.05). Based on the quadratic regression analysis of weight gain rate and feed efficiency of genetic improvement of farmed tilapia with dietary carbohydrate and crude lipid levels, the dietary optimal dietary carbohydrate and lipid ratios are 5.84 and 4.95, receptively. In conclusion, dietary optimal dietary carbohydrate and lipid ratio of genetic improvement of farmed tilapia in growth mid-stage is 4.95 to 5.84.

Cite this article

WU Fan , TIAN Juan , YU Lijuan , JIANG Ming , LIU Wei , LU Xing , WEN Hua . Effects of Dietary Carbohydrate to Lipid Ratio on Growth Performance, Body Composition and Serum Biochemical Indices of Genetic Improvement of Farmed Tilapia in Growth Mid-Stage[J]. Chinese Journal of Animal Nutrition, 2020 , 32(12) : 5805 -5815 . DOI: 10.3969/j.issn.1006-267x.2020.12.034

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