Effects of Vitamin E Supplemental Level on Growth Performance, Nutrient Digestibility, Nitrogen Metabolism and Serum Biochemical Indices of Blue Foxes during Growing Period
LIU Keyuan, LIU Hanlu, ZHONG Wei, ZHANG Xinyu, SHI Hongpeng, LI Guangyu
Institute of Special Economic Animal and Plant Science, Chinese Academy of Agricultural Sciences, Changchun 130112, China
Abstract：This experiment was conducted to investigate the effects of vitamin E supplemental level on growth performance, nutrient digestibility, nitrogen metabolism and serum biochemical indices of blue foxes (Alopex lagopus) during growing period. Seventy-five male blue foxes at 65 days of age with the similar body weight were randomly assigned to 5 groups with 15 replicates per group and 1 fox per replicate. The foxes in 5 groups were fed diets with 5 supplemental levels[0 (control), 50, 100, 150 and 200 mg/kg] of vitamin E from α-tocopherol acetate (effective substance concentration of 50%) based on a basal diet (background vitamin E content was 19.34 mg/kg). The trial lasted for 60 days after 10 days adaption. Eight foxes were selected from each group, a digestion metabolism experiment was conducted for 4 days starting at the 30th day of the trial. The results showed as follows:1) dietary vitamin E supplemental level significantly affected the body weight of day 56, and the average daily gain (ADG), average daily feed intake (ADFI) and feed/gain (F/G) of day 29 to 56 (P<0.05). With the dietary vitamin E supplemental level increasing, the ADG of day 29 to 56 was improved continually, however, the F/G of day 29 to 56 was decreased continually. As well as, the two indicators of the groups supplemented with 100, 200 and 300 mg/kg vitamin E had significant difference with the control group (P<0.05). Dietary vitamin E supplemental level significantly affected the fat digestibility (P<0.05), and the fat digestibility of the group supplemented with 200 mg/kg vitamin E was significantly higher than that of other groups (P<0.05). The activities of superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) in serum were significantly affected by dietary vitamin E supplemental level (P<0.05). The activity of SOD in serum of groups supplemented with 100 and 150 mg/kg vitamin E was significantly higher than that of group supplemented with 50 mg/kg vitamin E (P<0.05). The activity of GSH-Px in serum of groups supplemented with 100, 150 and 200 mg/kg vitamin E were significantly higher than that of group supplemented with 50 mg/kg vitamin E and control group (P<0.05). The content of immunoglobulin G (IgG) in serum was affected by dietary vitamin E supplemental level (P<0.05). The contents of IgG in serum of groups supplemented with 100, 150 and 200 mg/kg vitamin E were significantly higher than that of control group (P<0.05). Dietary vitamin E supplemental level significantly influenced the contents of total protein (TP), albumin (ALB), globulin (GLB) and triglycerides (TG) in serum (P<0.05). The contents of TG in serum of groups supplemented with 100, 150 and 200 mg/kg vitamin E was significantly lower than that of control group (P<0.05), while the content of GLB in serum was significantly higher than that of control group (P<0.05). These results indicate that adding vitamin E to the diet can increase the growth performance, fat digestibility and antioxidant ability, as well as reduce the content of TG in serum of blue foxes during growing period. Under the conditions of this experiment, considering the cost of breeding and the growing performance of blue foxes, the supplemental level of vitamin E in the diet of blue foxes during growing period is recommended to be 100 to 150 mg/kg.
刘可园, 刘晗璐, 钟伟, 张新宇, 史鸿鹏, 李光玉. 饲粮中维生素E添加水平对育成期蓝狐生长性能、营养物质消化率、氮代谢和血清生化指标的影响[J]. 动物营养学报, 2019, 31(9): 4170-4178.
LIU Keyuan, LIU Hanlu, ZHONG Wei, ZHANG Xinyu, SHI Hongpeng, LI Guangyu. Effects of Vitamin E Supplemental Level on Growth Performance, Nutrient Digestibility, Nitrogen Metabolism and Serum Biochemical Indices of Blue Foxes during Growing Period. Chinese Journal of Animal Nutrition, 2019, 31(9): 4170-4178.
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