Effects of dietary vitamin C on growth,antioxidant activity,and immunity in ricefield eel (Monopterus albus) |
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| Authors: | Yajun Hu Junzhi Zhang Lanbo He Yi Hu Lei Zhong Zhenyan Dai Dinggang Zhou |
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| Institution: | 1. College of Animal Technology, Sichuan Agriculture University, Ya'an, P. R. China;2. Hunan Engineering Technology Research Center of Featured Aquatic Resources Utilization, Hunan Agricultural University, Changsha, P. R. China |
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| Abstract: | A 10-week feeding trial aimed to investigate the effects of dietary vitamin C (l -ascorbic acid) on growth, antioxidant activity, and immunity in ricefield eel, Monopterus albus. Six diets were formulated with different levels of vitamin C supplementation (0.1, 17.5, 34.8, 68.6, 139.7, and 278.5 mg/kg). The results indicated that the weight gain (WG) of the M. albus fed the diets with vitamin C was remarkably higher than that of the M. albus fed the control diet (p < .05), and the quadratic analysis showed an optimal vitamin C level of 80.66 mg/kg. Compared with the control group, serum lysozyme activities, the complement pathway, red blood cell counts, white blood cell counts, immunoglobulin M, and phagocytosis percentage were significantly increased (p < .05) in the treatment groups, and superoxide dismutase activity, serum glucose, and malondialdehyde content were significantly decreased (p < .05) in the treatment groups. The challenge trial with Aeromonas hydrophila showed that the M. albus fed the diets with vitamin C had remarkably reduced cumulative mortality compared with those fed the control diet (p < .05), and mortality in the 68.60 mg/kg diet group was the lowest. Based on WG, the optimal vitamin C supplementation level for M. albus was estimated to be 80.66 mg/kg. |
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| Keywords: | antioxidant growth immunity Monopterus albus vitamin C |
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