本试验旨在研究9~10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(18%、16%、14%)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54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17 d,其中第1~3天为预试期,第4~17天为正试期.在试验期第11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9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:饲粮CP水平显著(P<0.05)或极显著(P<0.01)影响日增重和料重比,而饲粮ME水平极显著影响日干物质进食量(P<0.01);饲粮CP和ME水平的互作极显著影响生长性能(P<0.01);饲粮ME水平极显著影响总能利用率(P<0.01);饲粮CP和ME水平的互作显著影响氮利用率和总能利用率(P<0.05);饲粮CP和ME水平及其互作显著(P<0.05)或极显著(P<0.01)影响CP沉积率和ME沉积率.结果提示:9~10周龄CMD公鸭CP和ME日维持需要量分别为13.279 g/kg W^0.75和1 000.969 kJ/kg W^0.75,CP和ME需要量计算公式分别为CP=13.279W^0.75+0.019△W和ME=1 000.969W^0.75+1.083△W(W^0.75为代谢体重,△W为日增重),饲粮CP和ME水平分别为16.16%和12.15 MJ/kg.

This experiment was conducted to study the requirements of crude protein (CP) and metabolizable energy (ME) of China micro-duck (CMD) male ducks aged from 9 to 10 weeks. Five hundred and forty healthy 54-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 (18%, 16% or 14%) and ME (12.92, 12.19 or 11.49 MJ/kg). The feeding experiment lasted for 17 days, the duration of the preliminary experiment was from 1 to 3 days and the duration of the formal experiment was from 4 to 17 days. Ten ducks per group were chosen on the basis of individual weight close to the average weight of every group on 11 day of the experiment, and the ducks were used in a metabolism trial. At 07:00 on 4 days of the experiment before feeding, nine ducks 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: dietary CP level had significant effects on the daily gain and the ratio of feed to gain (P<0.05 or P<0.01), and the dietary ME level had significant effect on the daily dry matter intake (P<0.01); the interaction between dietary CP and ME levels had a significant effects on the growth performance (P<0.01); the interaction between dietary CP and ME levels was significant in the availability of nitrogen and gross energy (P<0.05); the dietary levels of CP and ME and their interaction had significant effects on the deposition rates of CP and ME (P<0.05 or P<0.01). The results suggest that for the male CMD ducks aged from 9 to 10 weeks, the daily maintenance requirements of CP and ME are 13.279 g/kg W^0.75 and 1 000.969 kJ/kg W^0.75, respectively; the calculation formulas of daily requirements of CP and ME are CP=13.279W^0.75+0.019△W and ME=1 000.969W^0.75+1.083△W (W^0.75 means metabolic body weight and △W means daily gain), respectively; the dietary levels of CP and ME are 16.16% and 12.15 MJ/kg, respectively.