Effects of dietary carbohydrate-to-lipid ratio on growth performance, plasma parameters and hepatic antioxidant status in ide (Leuciscus idus, Linnaeus, 1758)

Abstract

A 60-day feeding trial was carried out to investigate the effects of the dietary carbohydrate-to-lipid ratio (CHO:L) on growth performance, plasma parameters and hepatic antioxidant status in ide (Leuciscus idus). Six isonitrogenous and isoenergetic diets were formulated to contain various CHO:L ratios from 0.79 to 15.29. The final weight, weight gain (WG) and feed conversion ratio (FCR) were affected by the dietary CHO:L ratio, and the optimal values were found in fish fed a diet with a 3.66 ratio (P 0.05). The lowest total cholesterol content was observed in fish fed with highest dietary CHO:L ratio (P < 0.05). Significantly lower malondialdehyde contents were observed in fish fed diets with 2.23 and 3.66 CHO: L ratios than in those fed diets with 0.79 or 15.29 CHO:L ratios. The highest values of superoxide dismutase, glutathione peroxidase and catalase activities, total antioxidant capacity and glutathione content were found in fish fed a diet with a 2.23 CHO:L ratio. The present results indicated that diets with a CHO:L ratio 2.23 is optimal for juvenile ide antioxidant status, and the optimal dietary CHO：L ratio was calculated to be 2.96 and 2.79, respectively, based on the broken-line regression analysis of WG or FCR.

Keywords

• Ide
• Leuciscus idus
• Carbohydrate
• Lipid
• Growth performance
• Oxidative status