Dietary leucine level affects growth performance, whole body composition, plasma parameters and relative expression of TOR and TNF-alpha in juvenile blunt snout bream, Megalobrama amblycephala

文献类型： 外文期刊

第一作者： Ren, Mingchun

作者： Ren, Mingchun;Liu, Bo;Miao, Linghong;Ge, Xianping;Xie, Jun;Zhou, Qunlan;Pan, Liangkun;Ren, Mingchun;Habte-Tsion, Habte-Michael;Liu, Bo;Miao, Linghong;Ge, Xianping;Xie, Jun;Liang, Hualiang;Zhou, Qunlan

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关键词： Blunt snout bream (Megalobrama amblycephala);Growth performance;Leucine requirement;Branched-chain amino acid;TOR and TNF-alpha expression

期刊名称：AQUACULTURE （ 影响因子：4.242； 五年影响因子：4.723 ）

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收录情况： SCI

摘要： A 9-week feeding trial was conducted to investigate the effect of dietary leucine levels on growth, body composition, plasma parameters and relative expression of target of rapamycin (TOR) and tumor necrosis factor-alpha (TNF-alpha) mRNA in juvenile blunt snout bream. Six isonitrogenous and isoenergetic experimental diets were formulated to contain graded leucine levels ranging from 0.94% to 2.96% of dry diet. The results showed that survival rate was not significantly affected by dietary leucine level. Weight gain (WG), specific growth rate (SGR), feed efficiency ratio (FER) and protein efficiency ratio (PER) significantly increased with increasing dietary leucine level up to 1.74%, at 2.15% remained plateau and thereafter decreased with further increase of dietary leucine. 1.74% to 2.55% dietary leucine levels significantly improved protein contents of whole body and decreased lipid concentration. Plasma protein and cholesterol contents were not significantly affected by dietary leucine levels, while plasma triglyceride and glucose concentrations were significantly affected by dietary leucine levels. Plasma leucine concentration significantly increased with increasing dietary leucine level, whereas plasma isoleucine and valine concentrations showed reverse trends. Significantly higher relative expression levels of TOR mRNA was observed in fish fed with 1.74% leucine diet compared to those fed with 0.94% leucine diet. The highest relative expression level of TNF-alpha mRNA was observed in fish fed with 2.96% leucine diet, while the lowest value was observed in fish fed with 1.74% leucine diet (P < 0.05). Based on SGR and FER, the optimal dietary leucine level of juvenile blunt snout bream was determined to be 1.44% of dry diet (4.24% of dietary protein) and 1.61% of dry diet (4.74% of dietary protein), respectively.

分类号： S9

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