Growth performance and immune responses of gibel carp, Carassius auratus gibelio, fed with graded level of rare earth-chitosan chelate
文献类型: 外文期刊
作者: Zhou, Qun-lan 1 ; Xie, Jun 1 ; Ge, Xian-ping 1 ; Habte-Tsion, H. Michael 2 ; Liu, Bo 1 ; Ren, Mingchun 1 ;
作者机构: 1.Chinese Acad Fishery Sci, Minist Agr, Freshwater Fisheries Res Ctr, Key Lab Freshwater Fisheries & Germplasm Resource, Wuxi 214081, Jiangsu, Peoples R China
2.Nanjing Agr Univ, Wuxi Fisheries Coll, Wuxi 214081, Jiangsu, Peoples R China
关键词: Biochemistry parameter;Carassius auratus gibelio;Growth performance;Immune response;Rare earth-chitosan chelate
期刊名称:AQUACULTURE INTERNATIONAL ( 影响因子:2.235; 五年影响因子:2.616 )
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收录情况: SCI
摘要: A 12-week feeding trail was conducted to assess the effect of rare earth-chitosan chelate (RECC) on growth performance and immune responses of gibel carp, Carassius auratus gibelio. Isonitrogenous and isolipid experimental diets were supplemented with graded levels of rare earth-chitosan chelate (RECC 0, 0.8, 4 and 8 g Kg(-1)). A total of 720 gibel carps (initial body weight about 14.32 g) were divided randomly into four groups with six replicates, respectively. Fish were fed with the experimental diets three times every day. At the end of the feeding trail, the survival rate was higher than 96 %. Weight gain rate and specific growth rate (SGR) significantly increased with RECC supplementation up to 0.8 g Kg(-1) (P < 0.05) and tended to decline at higher supplementation levels, while feed conversion ratio was not significantly different between groups (P > 0.05). Based on broken-line regression analysis of SGR, the optimum dietary RECC was estimated to be 0.71 g Kg(-1) of the diet. Condition factor and viscerosomatic index were not significantly affected by RECC (P > 0.05), while hepatosomatic index in the group fed with 0.8 g Kg(-1) RECC (3.45 +/- A 0.10 %) was significantly lower than in other groups (P < 0.05). Plasma ALT was significantly affected by RECC (P < 0.05), while AST was not. Plasma total protein and albumin were increased with RECC supplementation up to 0.8 g Kg(-1) and decreased significantly at higher supplementation levels (P < 0.05). RECC supplementation significantly decreased plasma urea and glucose concentration and increased plasma creatinine concentration significantly (P < 0.05). Respiratory burst activity of phagocytes and myeloperoxidase activity were not significantly different between groups, while superoxide dismutase activity and nitrogen monoxide concentration were increased with the increasing level of RECC in the diets. In conclusion, RECC could enhance growth performance and improve immunity of gibel carp.
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