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Dietary folic acid requirement for grass carp fingerling,Ctenopharyngodon idella

ZHAO Zhi-yong1,2,WEN Hua2,WU Fan2,LIU An-long1,2,JIANG Ming2,LIU Wei2(1.College of Fisheries,Huazhong Agricultural University,Wuhan 430070,China; 2.Key Laboratory of Freshwater Ecology and Aquaculture,Yangtze River Fisheries Research Institute,Chinese Academy of Fishery Sciences,Jingzhou 434000,China)  
A feeding trial was conducted to determine the folic acid requirement of grass carp(Ctenopharyngodon idella) fingerling.Purified basal diets were formulated using vitamin-free casein and glutin as the protein source.Different levels of folic acid(0,0.5,1.0,2.0,5.0,10 and 20 mg folic acid/kg diet) were graded in the basal diet,resulting in seven dietary treatments in the experiment.Each diet was fed for 8 weeks to triplicate groups of grass carp with initial average weight(5.78±0.17)g.Grass carp fingerling fed diets supplemented with 5.0 mg folic acid/kg diet had significantly higher(P0.05) weight gain,feed efficiency,hemoglobinassay and platelet counting in blood than the control group fed without folic acid supplement.In contrast,the test groups had significantly lower(P0.05) triacylglycerol,total cholesterol and low density lipoprotein cholesterol in serum than the control group.Supplementation of dietary folic acid had no effect on survival rate,total protein and high density lipoprotein cholesterol levels in serum and red blood cell counting in blood.Weight gain,triacylglycerol,total cholesterol,hemoglobinassay and platelet counting analyzed by broken-line regression indicated that the requirement for dietary folic acid in rearing grass carp is approximately 3.6-4.3 mg/kg diet.
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