本试验旨在研究4~8周龄中畜小型白羽肉鸭(CMD)公鸭粗蛋白质(CP)和代谢能(ME)的需要量.采用3×3双因素试验设计,设3个CP水平(20%、18%、16%)和3个ME水平(12.92、12.19、11.49 MJ/kg),配制9种试验饲粮.选择540只体重相近、健康的19日龄CMD公鸭,随机分为9组,每组4个重复,每个重复15只.每组随机饲喂1种试验饲粮.饲养试验的试验期为38 d,其中第1~3天为预试期,第4~38天为正试期.在试验期第25天,每组挑选10只体重接近各组平均体重的试验鸭,进行代谢试验.在试验期第4天07:00饲喂前,从每组中挑选1只体重接近平均体重的试验鸭屠宰,进行比较屠宰试验.结果表明:随饲粮CP水平升高,日增重和日干物质进食量显著(P<0.05)或极显著(P<0.01)升高,料重比极显著降低(P<0.01);随饲粮ME水平升高,日增重极显著升高(P<0.01),料重比显著降低(P<0.05);饲粮CP和ME水平的互作极显著影响生长性能(P<0.01);随饲粮ME水平升高,总能利用率显著升高(P<0.05);饲粮CP和ME水平的互作极显著影响氮利用率和总能利用率(P<0.01);ME沉积率和CP沉积率分别随饲粮CP或ME水平升高而极显著(P<0.01)或显著(P<0.05)升高;饲粮CP和ME水平的互作极显著影响CP沉积率和ME沉积率(P<0.01).研究结果提示,4~8周龄CMD公鸭CP和ME日维持需要量分别为10.667 g/kg W^0.75和796.196 kJ/kg W^0.75,CP和ME需要量计算公式分别为CP=10.667W^0.75+0.117△W和ME=796.196W^0.75+3.880△W(W^0.75为代谢体重,△W为日增重),饲粮CP和ME水平分别为17.57%和11.87 MJ/kg.

This experiment was conducted to study the requirements of crude protein (CP) and metabolizable energy (ME) of male China micro-duck (CMD) ducks aged from 4 to 8 weeks. Five hundred and forty healthy 19-day-old male CMD ducks with similar body weight were used in a 3×3 double factorial design trial and randomly allocated into 9 groups with 4 replicates in each group and 15 ducks in each replicate. The ducks were fed 9 experimental diets with three levels of CP (20%, 18% or 16%) and ME (12.92, 12.19 or 11.49 MJ/kg). The feeding experiment lasted for 38 days, the duration of the preliminary experiment was from 1 to 3 days and the duration of the formal experiment was from 4 to 38 days. Ten ducks per group were chosen on the basis of individual weight close to the average weight of every group on 25 days of the experiment, and the ducks were used in a metabolism trial. At 07:00 on 4 days of the experiment before feeding, one duck per group were chosen on the basis of weight close to the average weight of every group, and those ducks were slaughtered in a comparative slaughter experiment. The results showed as follows: with the increase of dietary CP level, the daily gain and the daily dry matter intake were significantly increased (P<0.05 or P<0.01), and the ratio of feed to gain was significantly decreased (P<0.01); with the increase of dietary ME level, the daily gain was significantly increased (P<0.01), and the ratio of feed to gain was significantly decreased (P<0.01); the interaction between dietary CP and ME levels was significant in the growth performance (P<0.01); with the increased level of dietary ME level, the availability of gross energy was significantly increased (P<0.05); the interaction between dietary CP and ME levels was significant in the availability of nitrogen and gross energy (P<0.01); the deposition rates of ME or CP were significantly increased with the increase of dietary CP or ME levels (P<0.05 or P<0.01); the interaction between dietary CP and ME levels was significant in the deposition rates of CP and ME (P<0.01). The results suggest that for the male CMD ducks aged from 4 to 8 weeks, the daily maintenance requirements of CP and ME are 10.667 g/kg W^0.75 and 796.196 kJ/kg W^0.75, respectively; the calculation formulas of daily requirements of CP and ME are CP=10.667W^0.75+0.117△W and ME=96.196W^0.75+3.880△W (W^0.75 means metabolic body weight and △W means daily gain), respectively; the dietary levels of CP and ME are 17.57% and 11.87 MJ/kg, respectively.