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Water temperature affects the protein requirements, growth performance, and nutritional metabolism of grass carp (Ctenopharyngodon idella) juveniles

文献类型： 外文期刊

作者： Liang, Hualiang 1 ; Xu, Hao 2 ; Ge, Xianping 1 ; Zhu, Jian 1 ; Ren, Mingchun 1 ; Mi, Haifeng 3 ;

作者机构： 1.Chinese Acad Fishery Sci, Freshwater Fisheries Res Ctr, Key Lab Integrated Rice Fish Farming Ecol, Minist Agr & Rural Affairs, Wuxi 214081, Jiangsu, Peoples R China

2.Nanjing Agr Univ, Wuxi Fisheries Coll, Shanshui East Rd 9, Wuxi 21408, Jiangsu, Peoples R China

3.Tongwei Co Ltd, Hlth Aquaculture Key Lab Sichuan Prov, Chengdu 610093, Peoples R China

关键词： Dietary protein level; Precision; Glucolipid metabolism; Protein metabolism; Regulation

期刊名称：AQUACULTURE REPORTS （ 影响因子：3.385； 五年影响因子：3.645 ）

ISSN： 2352-5134

年卷期： 2022 年 25 卷

页码：

收录情况： SCI

摘要： This study aimed to determine whether water temperature and dietary protein levels played a role in regulating the growth and nutritional metabolism of juvenile grass carp (4.47 +/- 0.01 g). Six dietary protein levels (18.20%, 24.32%, 30.60%, 36.42%, 43.27%, 49.49%) and two levels of water temperature (23. and 28.) were used with a 6 x 2 experimental design method. After 60 days, the results demonstrated that appropriate dietary protein levels (30.60%, 23.; 36.42%, 28.) significantly increased the specific growth rate and weight gain rate of grass carp and significantly decreased the feed conversion ratio (P<0.05), and grass carp at 28 degrees C showed better feed utilization efficiency and growth performance. In addition, grass carp at 28 degrees C showed higher metabolic levels, and the expression of genes related to protein synthesis/catabolism, lipid synthesis/catabolism, and gluconeogenesis was significantly higher than at 23 degrees C. The highest plasma total cholesterol, plasma glucose and whole-body lipid content was observed in grass carp reared at 28 degrees C under low dietary protein level feeding (18.20%), while similar phenomena appeared in the high dietary protein levels (43.27%, 49.49%) feeding group at 23 degrees C.Correspondingly, a significantly higher the expression level of lipid anabolism genes was also observed in this dietary protein level. In addition, the plasma total cholesterol, total triglyceride, glucose, and total protein contents of grass carp under 23 degrees C culture were significantly higher than those of the 28 degrees C group. Based on the feed conversion ratio and specific growth rate by regression lines calculated using a quadratic model, the protein requirements of juvenile grass carp reared at 28 degrees C were 38.31%, and 38.03%, which were higher than the protein requirements of 36.76%, and 34.13% at 23 degrees C. These results may provide theoretical guidance for the precise protein requirements for grass carp juveniles reared at different temperatures.

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