本试验旨在研究2~3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(23%、20%、17%)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5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18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:随饲粮CP或ME水平升高,日增重与日干物质进食量均显著(P<0.05)或极显著(P<0.01)升高,而料重比极显著降低(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);氮利用率与总能利用率均随饲粮CP水平升高而显著(P<0.05)或极显著(P<0.01)降低,而总能利用率随饲粮ME水平升高而显著(P<0.05)或极显著(P<0.01)升高;随饲粮CP水平升高,ME沉积率极显著升高(P<0.01),而随饲粮ME水平升高,CP和ME的沉积率均极显著升高(P<0.01);饲粮CP和ME水平的互作极显著影响CP和ME沉积率(P<0.01). 研究结果提示,2~3周龄CMD公鸭CP和ME日维持需要量分别为17.485 g/kg W^0.75和1 168.438 kJ/kg W^0.75,CP 和ME需要量计算公式分别为CP=17.485W^0.75+0.094△W和ME=1 168.438W^0.75-0.097△W(W^0.75为代谢体重,△W为日增重),饲粮CP和ME水平分别为23.09%和12.43 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 2 to 3 weeks. Five hundred and forty healthy 5-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 (23%, 20% or 17%) 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 picked up on the basis of individual weight immediate to the average weight of every group on 11 days of the experiment, and the ducks were used in a metabolism trial. At 07:00 on 18 days of the experiment before feeding, nine ducks per group were chosen on the basis of individual weight close to the average weight of every group, and were slaughtered in a comparative slaughter experiment. The results showed as follows: with the increase of dietary CP or ME 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); the interaction between dietary CP and ME levels was significant in the growth performance (P<0.01); the availability of nitrogen and gross energy significantly was decreased (P<0.05 or P<0.01) with the increased level of dietary CP, but the availability of gross energy was significantly increased with the increased level of dietary ME (P<0.05 or P<0.01); the deposition rate of CP was significantly increased with the increase of dietary CP level (P<0.01), and the deposition rates of CP and ME were significantly increased with the increase rates of dietary ME level (P<0.01); the interaction between dietary CP and ME levels was significant in the deposition of CP and ME (P<0.01). The results suggest that for the male CMD ducks aged from 2 to 3 weeks, the daily maintenance requirements of CP and ME are 17.485 g/kg W^0.75 and 1 168.438 kJ/kg W^0.75, respectively; the calculation formulas of daily requirements of CP and ME are CP=17.485W^0.75+0.094△W and ME=1 168.438W^0.75-0.097△W (W^0.75 means metabolic body weight and △W means daily gain), respectively; the dietary levels of CP and ME are 23.09% and 12.43 MJ/kg, respectively.