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首页> 外文期刊>Aquaculture International >Effects of L-tryptophan-supplemented dietary on growth performance and 5-HT and GABA levels in juvenile Litopenaeus vannamei
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Effects of L-tryptophan-supplemented dietary on growth performance and 5-HT and GABA levels in juvenile Litopenaeus vannamei

机译：补充L-色氨酸的饲料对南美白对虾生长性能以及5-HT和GABA水平的影响

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A 60-day feeding trial was conducted to evaluate the effects of dietary l-tryptophan level on the growth performance and neurotransmitter, including 5-hydroxytryptamine (5-HT) and gamma-aminobutyric acid (GABA) of juvenile Litopenaeus vannamei. Six experimental diets were formulated to supplement with graded levels of tryptophan, resulting in different dietary tryptophan levels at 0 (control), 0.12, 0.24, 0.36, 0.48 and 0.60 %, respectively. A total of 960 shrimps (0.63 +/- A 0.01 g) were divided into six treatments and fed with the respective tryptophan diets in an indoor recirculating system. The results showed that the body weight, body length, live weight gain, specific growth rate, protein efficiency ratio and survival rate were significantly increased by dietary tryptophan levels, and the maximum were all obtained at 0.60 % tryptophan-supplemented diet. Feed conversion ratio was significantly decreased as dietary tryptophan level increased. No significant difference was found in hepatopancreas index and body proximate composition among all the treatments. High-performance liquid chromatography analysis showed that 5-HT level increased first and then decreased in all examined tissues except in thoracic ganglia with dietary tryptophan level increased, while GABA level first elevated and then decreased in X organ-sinus gland, brain, stomach and intestinal tract, and on the contrary, in thoracic ganglia, hepatopancreas, but declined in hemolymph with higher dietary tryptophan level. qRT-PCR results exhibited 5-HT1 mRNA expression was similar to 5-HT level variation. Based on these results, the dietary tryptophan supplemented 0.36 % dry diet or 1.72 % protein diet is found to be optimum to improve L. vannamei growth performance. In conclusion, it suggested that diet supplemented with tryptophan was beneficial to improve growth performance possibly by mediating 5-HT as well as GABA pathway in L. vannamei. These data provide new insight into the physiological functions of tryptophan in shrimp.
机译：进行了为期60天的喂养试验，以评估饮食中L-色氨酸水平对少年对虾南美白对虾的生长性能和神经递质（包括5-羟色胺（5-HT）和γ-氨基丁酸（GABA））的影响。配制了六种实验饮食以补充色氨酸的分级水平，分别导致0（对照），0.12、0.24、0.36、0.48和0.60％的不同饮食色氨酸水平。将总共​​960只虾（0.63 +/- A 0.01 g）分为6种处理方法，并在室内循环系统中分别饲喂色氨酸饲料。结果表明，饮食色氨酸水平显着提高了体重，体长，活体增重，比生长率，蛋白质效率比和存活率，而在补充色氨酸的饮食中0.60％可达到最大值。饲料中的色氨酸水平随着饲料中色氨酸水平的升高而明显降低。在所有治疗中，肝胰脏指数和身体附近成分均无显着差异。高效液相色谱分析显示，除胸神经节外，饮食中色氨酸水平升高，其余所有组织中5-HT水平先升高后降低，而X器官-窦，脑，胃和胃中GABA水平先升高后降低。肠道，相反，在胸神经节中，肝胰腺，但饮食色氨酸水平较高的血淋巴减少。 qRT-PCR结果显示5-HT1 mRNA表达类似于5-HT水平变化。根据这些结果，发现补充色氨酸的日粮添加0.36％的干日粮或1.72％的蛋白质日粮最适合改善南美白对虾的生长性能。总之，这表明补充色氨酸的饮食可能通过介导南美白对虾的5-HT以及GABA途径来改善生长性能。这些数据提供了对虾中色氨酸的生理功能的新见解。

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