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Effects of L-tryptophan-supplemented dietary on growth performance and 5-HT and GABA levels in juvenile Litopenaeus vannamei

文献类型： 外文期刊

作者： Sun, Yu-Ping 1 ; Guan, Li-Zeng 3 ; Xiong, Jie-Hua 1 ; Xi, Qian-Yun 1 ; Zhang, Yong-Liang 1 ;

作者机构： 1.South China Agr Univ, Coll Anim Sci, SCAU Alltech Res Joint Alliance, Guangzhou 510642, Guangdong, Peoples R China

2.Guangdong Acad Agr Sci, Inst Anim Sci, Guangzhou 510640, Guangdong, Peoples R China

3.Yanbian Univ, Coll Agr, Yanji 133000, Peoples R China

关键词： Tryptophan;Growth performance;5-HT;5-HT1 receptor;GABA;Juvenile Litopenaeus vannamei

期刊名称：AQUACULTURE INTERNATIONAL （ 影响因子：2.235； 五年影响因子：2.616 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： 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.

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