Dietary Niacin Requirement of GIFT Tilapia, Oreochromis niloticus, Reared in Freshwater

文献类型： 外文期刊

第一作者： Jiang, Ming

作者： Jiang, Ming;Huang, Feng;Wen, Hua;Yang, Changgeng;Wu, Fan;Liu, Wei;Tian, Juan;Jiang, Ming;Huang, Feng

作者机构：

期刊名称：JOURNAL OF THE WORLD AQUACULTURE SOCIETY （ 影响因子：2.512； 五年影响因子：2.47 ）

ISSN： 0893-8849

年卷期： 2014 年 45 卷 3 期

页码：

收录情况： SCI

摘要： The aim of our experiment was to determine the dietary niacin requirement of genetically improved farmed tilapia (GIFT) tilapia, Oreochromis niloticus, reared in freshwater. Six semi-purified diets were formulated to contain graded levels of niacin (6.4 [basal diet], 16.8, 36.8, 68.5, 143.8, and 297.8 mg/kg). Each diet was fed to triplicate groups of 30 fish (initial average weight 87.2 +/- 3.3 g) for 12 wk in 5.6-m(3) aquaria (r=1.5m, h=0.8m). Results showed that the weight gain rate (WGR) of the fish increased linearly with dietary niacin levels increasing, but there were no further benefits above 36.8 mg/kg. The niacin concentrations in fish livers were positively correlated with dietary levels of niacin and plateaued when niacin in diet exceeded 84.6 mg/kg. With increasing dietary niacin level, serum high density lipoprotein cholesterol (HDLC) content significantly increased, while serum triacylglycerol (TG) content significantly decreased (P < 0.05). There were no significant differences in serum glucose (GLU) and total cholesterol (T-CHO) contents in the separate fish groups (P > 0.05). Broken-line regression analysis showed that GIFT tilapia (87-376 g) require a minimum of 20.4 mg/kg niacin in the diet for maximal growth, and 84.6 mg/kg for the highest liver niacin accumulation.

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