Evaluation of dietary vitamin E supplementation on growth performance and antioxidant status in hybrid snakehead (Channa argus × Channa maculata) |
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| Authors: | H Zhao H‐J Ma S‐N Gao X‐R Chen Y‐J Chen P‐F Zhao S‐M Lin |
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| Affiliation: | 1. College of Animal Science and Technology, Southwest University, Chongqing, China;2. Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Southwest University, Chongqing, China;3. Tongwei Co. Ltd., Special Fisheries Research Institute, Chengdu, China |
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| Abstract: | An 8‐week feeding trial was conducted to investigate the effects of dietary vitamin E on growth performance and antioxidant status of juvenile snakehead. The snakeheads (20.47 ± 0.06 g) were fed with five isonitrogenous and isoenergetic experimental diets that contained 13 (the basal diet), 52, 79, 168 and 326 mg of vitamin E kg?1, respectively. The maximum specific growth rate (SGR) and feed intake (FI) were achieved in fish fed on a diet with 79 mg kg?1 vitamin E (p < .05). No significant differences were found in protein efficiency ratio (PER), feed conversion ratio (FCR) and survival of fish among all groups (p > .05). Vitamin E supplementation improved hepatic glutathione peroxidase (GPx) activity significantly. A consistent decline in the hepatic and serum malondialdehyde (MDA) content was observed in fish fed diets with the increased supplementation of vitamin E (p < .05). In addition, with the increasing level of vitamin E, serum alanine aminotransferase (ALT) and aspartate aminotransferase (AST) were reduced (p < .05). However, serum superoxide dismutase (SOD), catalase (CAT) and alkaline phosphatase (ALP) activities were enhanced in fish fed 79 mg vitamin E kg?1 diet and then decreased significantly as the content of vitamin E in the diet increased (p < .05). Meanwhile, serum albumin (ALB) and globulin (GLB) were not affected by the supplemental levels of dietary vitamin E (p > .05). The vitamin E concentrations in liver and serum increased significantly with increasing dietary vitamin E (p < .05). Based on the broken‐line regression of SGR, vitamin E level in the diet is estimated to be 80.5 mg kg?1 for Channa argus × Channa maculata. In conclusion, this study indicated that the dietary appropriate vitamin E could enhance the growth performance, antioxidant status and non‐specific immune response. |
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| Keywords: | antioxidant capacity growth performance juvenile snakehead α ‐tocopherol |
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