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Effects of dietary phosphorus on growth, body composition and immunity of young taimen Hucho taimen (Pallas, 1773)

文献类型: 外文期刊

作者: Wang, Chang'an 1 ; Li, Jinnan 1 ; Wang, Liansheng 1 ; Zhao, Zhigang 1 ; Luo, Liang 1 ; Du, Xue 1 ; Yin, Jiasheng 1 ; Xu, 1 ;

作者机构: 1.Chinese Acad Fishery Sci, Heilongjiang River Fisheries Res Inst, 43 Songfa St, Harbin 150070, Peoples R China

关键词: body composition;Hucho taimen;growth;phosphorus;immunity

期刊名称:AQUACULTURE RESEARCH ( 影响因子:2.082; 五年影响因子:2.415 )

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年卷期:

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收录情况: SCI

摘要: The effects of dietary phosphorus (P) on growth, body composition and immunity of young taimen (Hucho taimen) were studied. Six purified diets contained graded levels (2.3-control, 4.0, 5.6, 7.5, 9.1 and 10.8 g kg(-1) diet) of available P. Each diet was fed to triplicate groups of 30 fish with an initial average weight (55.31 +/- 0.38) g for 84 days. The weight gain, specific growth rate and feed conversion ratio were improved by dietary available P up to 4.35 g kg(-1) (P < 0.05) and then levelled off. Hepatosomatic index and body crude lipid content decreased significantly with increasing P levels, while ash contents and P concentrations in the whole body and vertebrae increased by dietary available P up to 4.36 and 4.44 g kg(-1) and then levelled off respectively (P < 0.05). Liver superoxide dismutase and glutathione peroxidase and plasma alkaline phosphatase activities in the treatment groups were significantly higher compared with the control group (P < 0.05). Plasma IgM contents increased linearly with increasing dietary P from 4.0 to 9.1 g kg(-1) group and then decreased. Dietary P supplementation reduced plasma triglyceride, malondialdehyde and liver malondialdehyde contents. There were no significant effects on plasma total protein, albumin, globulin, glucose, aspartate aminotransferase and alanine aminotransferase, catalase, lysozyme and liver catalase compared with the control group (P > 0.05). Broken line regression analysis indicated that dietary available P requirement was 4.34 and 4.35 g kg(-1), based on weight gain and P concentration in the whole body respectively.

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