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- W2337648006 abstract "An experiment was conducted to investigate the effects of dietary zinc on growth performance, body composition,tissue zinc accumulation and antioxidation of juvenile starry flounder ( Platichthys stellatus) with zinc sulfate( ZnSO4·7H2O) as zinc source,by using a purified diet based on casein-gelatin as the protein sources. The basal diet was supplemented with 0,50,100,150,200 and 400 mg zinc per kg diet respectively and juvenile starry flounder[initial weight( 62. 89 ±0. 51) g]were fed 6 purified diets containing graded levels of zinc( 19. 95,71. 06,118. 50,174. 00,226. 10 and 411. 20 mg /kg) respectively for 66-day experimental period. The results showed that weight gain rate( WGR) increased significantly with increasing dietary zinc level( P 0. 05) ,but no significant differences were observed among the juveniles fed the diets with equal to or higher than 174. 00 mg /kg of dietary zinc( P 0. 05) ,special growth rate( SGR) and WGR followed the same trend. The fish got the highest WGR,SGR and the lowest feed conversion rate( FCR) in the treatment with 174. 00 mg /kg of dietary zinc. No significant differences were observed in whole body composition among dietary treatments( P 0. 05) ,the fat deposition in muscle of zinc supplementation of 0 mg /kg group was significantly higher than those in the other groups( P 0. 05) . When the juveniles were fed the diet with 411. 20 mg /kg of dietary zinc,the zinc accumulation contents in the whole body,vertebrae and muscle were significantly higher than those in the other groups( P 0. 05) . When the juveniles were fed 118. 50 -411. 20 mg /kg of dietary zinc,the zinc accumulation contents in whole body,vertebrae and serum were significantly higher than 19. 95 mg /kg group and 71. 06 mg /kg group( P 0. 05) ,however,the liver zinc contents remained comparatively stable among all groups( P 0. 05) . Serum total antioxidant capacity and superoxide dismutase ( SOD ) activity increased significantly with increasing dietary zinc level ( P 0. 05) ,and then leveled off when the juveniles were fed the diets with equal to or higher than 174. 00 mg /kg of dietary zinc. In conclusion,it could improve growth performance and tissue zinc accumulation,and enhance antioxidation function by adding proper dose of zinc in basic diet of juvenile starry flounder. Broken-line regression analysis showed that the optimum dietary zinc requirement for juvenile starry flounder,using WGR as response criteria,was 167. 88 mg /kg of dietary zinc." @default.
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- W2337648006 date "2010-01-01" @default.
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- W2337648006 title "Effects of dietary zinc on growth performance,tissue accumulation and antioxidation of juvenile starry flounder( Platichthys stellatus)" @default.
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