本试验旨在研究饲粮铜添加水平对生长獭兔生长性能、毛皮品质、肌肉品质及氮代谢的影响。选取200只体况相近的1月龄健康獭兔，随机分为5组（每组40个重复，每个重复1只），分别饲喂在基础饲粮中添加0、5、15、45、135 mg/kg铜的试验饲粮，试验饲粮中铜含量的实测值分别为8.19、13.59、23.78、54.08、143.68 mg/kg。预试期7 d，正试期60 d。结果表明：饲粮铜添加水平对平均日增重、平均日采食量有极显著影响（P<0.01），对料重比没有显著影响（P>0.05）。当饲粮铜添加水平为15 mg/kg时，平均日增重及平均日采食量均达到最高值。饲粮铜添加水平对毛皮重量有显著影响（P<0.05），对毛皮面积及毛皮厚度没有显著影响（P>0.05）。5 mg/kg组的毛皮重量显著高于45、135 mg/kg组（P<0.05），但与15 mg/kg组差异不显著（P>0.05）。饲粮铜添加水平对肌肉滴水损失有极显著影响（P<0.01），对肌肉pH_{45 min}和黄度值有显著影响（P<0.05），对肌肉剪切力及亮度、红度值均无显著影响（P>0.05）。当饲粮铜添加水平为15 mg/kg时滴水损失有最小值，pH_{45 min}有最大值。饲粮铜添加水平对食入氮、尿氮、沉积氮、氮利用率及氮生物利用率有极显著影响（P<0.01），对粪氮、氮表观消化率有显著影响（P<0.05）。综合本试验测定指标，生长獭兔饲粮适宜的铜添加水平为15 mg/kg（饲粮中铜含量的实测值为23.78 mg/kg）。

This experiment was conducted to investigate the effects of dietary copper supplemental level on growth performance, fur quality, meat quality and nitrogen metabolism of growing Rex rabbits. Two hundred 1-month-old Rex rabbits with the similar health conditions were randomly assigned to 5 groups with 40 replicates per group and 1 rabbit per replicate. Rabbits in 5 groups were fed experimental diets with the following copper supplemental levels:0, 5, 15, 45 and 135 mg/kg, and copper content measured values in experimental diets were 8.19, 13.59, 23.78, 54.08 and 143.68 mg/kg, respectively. The trial lasted for 7 days for adaptation and 60 days for test. The results showed as follows:dietary copper supplemental level had extremely significant influences on average daily gain and average daily feed intake (P<0.01), and had no significant influence on feed/gain (P>0.05). The highest values of average daily gain and average daily feed intake appeared when dietary copper supplemental level was 15 mg/kg. Dietary copper supplemental level had significant influence on fur weight (P<0.05), but had no significant influences on fur area and fur thickness (P>0.05). The fur weight in 5 mg/kg group was significantly higher than that in 45 and 135 mg/kg groups (P<0.05), but no significant difference was found between 5 and 15 mg/kg groups (P>0.05). Dietary copper supplemental level had extremely significant influence on drip loss (P<0.01), and had significant influences on muscle pH_{45 min} and yellowness (b^*) value (P<0.05), but had no significant influences on muscle shear force and the values of lightness (L^*) and redness (a^*) (P>0.05). The minimum of drip loss and the maximum of pH_{45 min} appeared when dietary copper supplemental level was 15 mg/kg. Dietary copper supplemental level had extremely significant influences on nitrogen intake, urinary nitrogen, digestible nitrogen, nitrogen retention, nitrogen apparent digestibility and nitrogen bioavailability (P<0.01), and had significant influences on fecal nitrogen and nitrogen availability (P<0.05). Considering all indices of this experiment, the appropriate dietary copper supplemental level is 15 mg/kg for growing Rex rabbits (dietary copper content measured value is 23.78 mg/kg).