Effect of dietary arachidonic acid levels on growth performance, hepatic fatty acid profile, intermediary metabolism and antioxidant responses for juvenile Synechogobius hasta

文献类型： 外文期刊

第一作者： Luo, Z.

作者： Luo, Z.;Tan, X-Y;Luo, Z.;Yin, G-J;Li, X-D

作者机构：

关键词： arachidonic acid;growth performance;hepatic antioxidant response;hepatic intermediary metabolism;Synechogobius hasta

期刊名称：AQUACULTURE NUTRITION （ 影响因子：3.497； 五年影响因子：3.78 ）

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收录情况： SCI

摘要： An 8-week feeding experiment was conducted to determine the effect of dietary arachidonic acid (ARA) levels on growth performance, hepatic intermediary metabolism and antioxidant responses for juvenile Synechogobius hasta. Five isonitrogenous and isolipidic diets were formulated with arachidonic oil (containing 400 g ARA kg-1) at inclusion levels of 0, 2, 4, 8 and 16 g kg-1 to replace corn oil. Dietary ARA levels were 0.6, 8.6, 16.7, 32.7 and 64.8 g kg-1 total fatty acids (FAs), respectively. Fish fed the 8.632.7 g ARA kg-1 total FAs showed the highest weight gain, specific growth rate (SGR) and feed intake. By contrast, feed conversion ratio was the lowest for fish fed the 8.632.7 g ARA kg-1 total FAs. Increasing ARA and total n-6 fatty acid contents and declining linoleic acid content in liver were observed in fish fed the diet containing increasing dietary ARA levels. As a consequence, ?n-6/?n-3 ratios increased with increasing dietary ARA levels. Dietary ARA levels significantly influenced several enzymatic activities involved in hepatic intermediary metabolism, such as succinate dehydrogenase, lactate dehydrogenase, lipoprotein lipase and hepatic lipase. Superoxide dismutase activity increased with increasing dietary ARA levels. Glutathione peroxidase and catalase activities and malondialdehyde levels in liver tended to increase with increasing dietary ARA levels from 0.6 to 32.7 g ARA kg-1 total FAs then declined when dietary ARA levels further increased to 64.8 g ARA kg-1 total FAs. Broken-line regression analysis of SGR against dietary ARA level indicated that optimal dietary ARA requirement for juvenile S. hasta was 10.74 g kg-1 total FAs.

分类号： Q17

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