Dietary arginine requirement of juvenile grass carp Ctenopharyngodon idella (Valenciennes in Cuvier & Valenciennes, 1844) |
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| Authors: | Yu‐Jie Gao Hui‐Jun Yang Ding‐Qian Guo Yong‐Jian Liu Ying‐ying Yu Shi‐Jun Chen Li‐Xia Tian |
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| Affiliation: | 1. Nutrition Laboratory, Institute of Aquatic Economical Animals, School of Life Science, Sun Yat‐Sen University, Guangzhou, China;2. Guangzhou A'Share Aquatech CO., Ltd, Guangzhou, China |
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| Abstract: | This experiment was conducted to estimate the optimum requirement of arginine for juvenile grass carp Ctenopharyngodon idella. Six isonitrogenous (38%) and isoenergetics (16 MJ kg?1) semi‐purified diets containing casein and gelatine with graded level of arginine (0.93, 1.20, 1.51, 1.84, 2.10 and 2.41 g 100 g?1 DM) were formulated. Each diet was randomly assigned to triplicate groups of 25 fish each tank (initial weight: 3.84 ± 0.01) for 10 weeks. The highest weight gain (WG, %) was recorded when arginine level was 2.10% of the diet. Dietary arginine level higher than 1.84% significantly increased the protein contents of whole body. Whole body amino acid composition of juvenile grass carp was not significantly affected by the dietary arginine level. Plasma‐free arginine level was increased linearly with increasing of arginine level in the diets, and the plasma‐free ornithine level was significantly higher when the dietary arginine level was 2.41% compared with other groups. Quadratic model analysis of SGR data indicated that the minimum recommended dietary arginine requirement for grass carp was 2.17% of the diet, corresponding to 5.71% of dietary protein. |
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| Keywords: | grass carp arginine requirement growth performance biochemical parameters amino acid composition |
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