Effects of Dietary Lipid Level on Growth Performance and Flesh Quality of Juvenile Carassius auratus var. Dongtingking

  • LEI Yanju ,
  • YAN Jin ,
  • TANG Zhongtian ,
  • ZOU Chaoxia ,
  • YANG Pinhong ,
  • ZHANG Yunsheng ,
  • HUANG Haihong ,
  • HUANG Chunhong ,
  • XIE Zhongguo
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  • Key Laboratory of Zoology in Hunan Higher Education, Collaborative Innovation Center for Efficient and Health Production of Fisheries in Hunan Province, Hunan University of Arts and Science, Changde 415000, China

Received date: 2020-05-23

  Online published: 2020-12-07

Abstract

This experiment was conducted to investigate the effects of dietary lipid level on growth performance and flesh quality of juvenile Carassius auratus var. Dongtingking. A total of 240 healthy juvenile Carassius auratus var. Dongtingking with similar body weight were randomly divided into 4 groups with 3 replicates per group and 20 fish per replicate. Four isonitrogenous and unequal lipid experimental diets were formulated using fish meal, soybean meal, rapeseed meal and cottonseed meal as protein source and rapeseed oil and soybean oil (1:1) as lipid source, and fish in each groups were fed experimental diets which the lipid levels were 0, 4%, 8% and 12%, respectively. The experiment lasted for 60 days. The results showed as follows: 1) the final body weight, weight gain rate and specific growth rate of 12% lipid level group were significantly higher than those of 0 and 4% lipid level groups (P<0.05). 2) The muscle crude lipid content of 12% lipid level group was significantly higher than that of 0 and 4% lipid level groups (P<0.05), while the muscle moisture content of 12% lipid level group was significantly lower than that of 0 lipid level group (P<0.05). 3) The muscle iron content of 0 and 4% lipid level groups was significantly higher than that of 8% and 12% lipid level groups (P<0.05), and the muscle magnesium content of 0 lipid level group was significantly higher than that of 8% lipid level group (P<0.05). 4) The muscle monounsaturated fatty acids (PUFA) content of 12% lipid level group was significantly higher than that of 0 lipid level group (P<0.05), the contents of C18:2n6 and n-6 PUFA and n-6/n-3 PUFA in muscle of 12% lipid level group were significantly higher than those of 0 lipid level group (P<0.05), and the contents of C16:0 and saturated fatty acids (SFA) in muscle of 0 lipid level group were significantly higher than those of 8% and 12% lipid level groups (P<0.05). 5) The contents of nonessential amino acids and flavor amino acids in muscle of 0 lipid level group were significantly higher than those other groups (P<0.05). In conclusion, the juvenile Carassius auratus var. Dongtingking fed high lipid level (12%) diet can get better growth effect, but the flesh quality is reduced.

Cite this article

LEI Yanju , YAN Jin , TANG Zhongtian , ZOU Chaoxia , YANG Pinhong , ZHANG Yunsheng , HUANG Haihong , HUANG Chunhong , XIE Zhongguo . Effects of Dietary Lipid Level on Growth Performance and Flesh Quality of Juvenile Carassius auratus var. Dongtingking[J]. Chinese Journal of Animal Nutrition, 2020 , 32(12) : 5839 -5849 . DOI: 10.3969/j.issn.1006-267x.2020.12.037

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