本试验旨在探讨饲粮维生素A添加水平对3~5月龄生长獭兔生长性能、毛皮品质、维生素A沉积、血清生化指标及抗氧化性能的影响。选取平均体重为（1.50±0.14）kg的3月龄獭兔200只，随机分成5组（每组40个重复，每个重复1只），对照组饲喂基础饲粮，试验组分别饲喂添加5 000、10 000、20 000和40 000 IU/kg维生素A的试验饲粮，预试期7 d，正试期53 d。结果表明：饲粮维生素A添加水平对料重比有显著影响（P<0.05），对平均日增重、平均日采食量均无显著影响（P>0.05）；饲粮维生素A添加水平对獭兔毛皮重量和毛皮面积影响极显著（P<0.01），对毛囊密度、初级毛囊密度、次级毛囊密度和次级毛囊密度/初级毛囊密度均无显著影响（P>0.05）；饲粮维生素A添加水平对血清及肝脏维生素A含量影响显著（P<0.05），血清和肝脏维生素A含量均随饲粮维生素A添加水平的提高显著升高（P<0.05）；饲粮维生素A添加水平对血清尿素氮和白蛋白含量影响显著（P<0.05），对血清总蛋白、甘油三酯、胆固醇、高密度脂蛋白、低密度脂蛋白含量影响均不显著（P>0.05）；饲粮中添加维生素A可以极大地改善血清和肝脏的抗氧化性能，饲粮维生素A添加水平对血清谷胱甘肽过氧化物酶（GSH-Px）和总超氧化物歧化酶（T-SOD）活性影响极显著（P<0.01），对血清丙二醛（MDA）含量影响显著（P<0.05），对肝脏GSH-Px活性影响极显著（P<0.01），对肝脏T-SOD活性和MDA含量有显著影响（P<0.05），对肝脏总抗氧化能力无显著影响（P>0.05）。综合考虑本试验所测指标，生长獭兔饲粮中维生素A适宜添加水平为10 000 IU/kg。

The purpose of this trial was to study the effects of dietary vitamin A level on growth performance, fur quality, vitamin A deposition, serum biochemical indices and antioxidant function of growing Rex rabbits aged 3 to 5 months. Two hundred 3-month-old Rex rabbits with an average body weight of (1.50±0.14) kg were randomly assigned to 5 groups with 40 replicates in each group and each replicate contained 1 rabbit. Rabbits in control group were fed a basal diet, and rabbits in the experimental groups were fed experimental diets containing 5 000, 10 000, 20 000 and 40 000 IU/kg vitamin A, respectively. There was a pretrial period of 7 days followed by an experimental period of 53 days. The results showed as follows: the dietary vitamin A level had a significant impact on feed/gain (P<0.05), and had no significant effects on average daily feed intake and average daily gain (P>0.05); the dietary vitamin A level had significant impacts on fur weight and fur area (P<0.01), and had no significant effects on hair follicle density, primary hair follicle density, secondary hair follicle density and secondary hair follicle density/primary hair follicle density (P>0.05); the dietary vitamin A level had significant impacts on vitamin A content in serum and liver (P<0.05), and the vitamin A content in serum and liver was observably increased with the increase of dietary vitamin A level (P<0.05); the dietary vitamin A level had significant impacts on urea nitrogen, total protein and albumin contents in serum (P<0.05), and had no significant effects on triglyceride, cholesterol, high density lipoproteins and low density lipoprotein contents in serum (P>0.05); the dietary vitamin A supplement could improve the anti-oxidative activity in serum and liver, had significant impacts on the activities of glutathione peroxidase (GSH-Px) and total superoxide dismutase (T-SOD) (P<0.01), and malondialdehyde (MDA) content (P<0.05) in serum, had significant impacts on the activities of GSH-Px (P<0.01) and T-SOD (P<0.05), and MDA content (P<0.05)in liver, and had no significant effect on total antioxidation capacity in liver (P>0.05). Considering all indices of this experiment, the appropriate vitamin A level in the diet of growing Rex rabbit is 10 000 IU/kg.