Effects of dietary folic acid on the growth, digestive enzyme activity, immune response and antioxidant enzyme activity of blunt snout bream (Megalobrama amblycephala) fingerling
文献类型: 外文期刊
作者: Sesay, Daniella Fatmata 1 ; Habte-Tsion, Habte-Michael 1 ; Zhou, Qunlan 1 ; Ren, Mingchun 1 ; Xie, Jun 1 ; Liu, Bo; 1 ;
作者机构: 1.Nanjing Agr Univ, Wuxi Fisheries Coll, Wuxi 214081, Jiangsu, Peoples R China
2.CAFS, FFRC, Key Lab Genet Breeding Aquat Anim & Aquaculture B, Wuxi 214081, Jiangsu, Peoples R China
3.CAFS, FFRC, Key Lab Genet Breeding Aquat Anim
关键词: Blunt snout bream;Dietary folic acid;Growth performance;Immune response;Enzyme activity
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: This study carried out a 10-week feeding trial to investigate the effects of dietary folic acid on the growth, digestive enzyme activity, immune response and antioxidant enzyme activity of blunt snout bream (Megalobrama amblycephala) fingerlings. For this purpose, six semi-purified diets were formulated to contain graded levels of folic acid (0.0, 0.5, 1.0, 2.0, 5.0, and 10.0 mg/kg diets), and three tanks (300 l/tank) were randomly arranged and assigned to each experimental diet. Blunt snout bream fingerlings (initial weight 27.0 +/- 0.03 g) were fed with the diets to near satiation four times daily. The results showed that final body weight, weight gain rate, specific growth rate and feed efficiency ratio significantly (P < 0.05) increased with an increasing dietary folic acid level of up to 1.0 mg/kg, plateaued at up to 2.0 mg/kg and thereafter reduced. Fish fedwith 1.0-5.0mg/kg dietary folic acid showed a significant rise (P < 0.05) in Fulton condition factor compared to those fed with an un-supplemented diet, while reverse trends were observed in viscerosomatic and hepatosomatic indexes. Serum urea content of the groups fed with 1.0 and 2.0 mg/kg dietary folic acid, and alkaline phosphate activity of the group fed with a 2.0 mg/kg diet were significantly lower than those fed with the control diet. Muscle crude protein content, serum total protein, complement 3, complement 4 and immunoglobulin M contents, and intestinal amylase, lipase, trypsin and chymotrypsin activities were significantly (P < 0.05) enhanced as the dietary folic acid level increased up to 1.0 mg/kg and thereafter plateaued. Malondialdehyde activity in fish fed with 1.0-5.0 mg/kg dietary folic acid was significantly lower than those fedwith un-supplemented diet, while reverse patterns were found in superoxide dismutase and catalase activities (P < 0.05). Based on the broken line-regression analysis of weight gain rate, specific growth rate and hepatosomatic index, the optimum dietary folic acid for blunt snout fingerlings was estimated to be 0.68, 0.68 and 0.82 mg/kg, respectively.
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