本试验旨在研究饲粮粗蛋白质(CP)和代谢能(ME)水平对4~8周龄四川白鹅生产性能和氮平衡的影响。采用3×3双因素试验设计,设3个ME水平(12.86、12.13、11.43 MJ/kg)和3个CP水平(17%、15%、13%),配制9种试验饲粮。选择540只体重相近、健康的22日龄四川白鹅,随机分成9组,每组4个重复,每个重复15只。试验期为35 d。在试验第21天,每组挑选8只体重接近各组平均体重的试验鹅进行代谢试验。结果表明:1)CP水平对料重比有显著影响(P<0.05),ME水平对日干物质(DM)采食量、料重比有极显著影响(P<0.01),CP和ME水平的互作对日DM采食量有极显著影响(P<0.01)。随着CP水平的增加,每克增重消耗CP量极显著上升(P<0.01),每克增重消耗ME量先降低后升高(P<0.01)。2)CP水平对食入氮、粪尿氮、氮利用率、GE代谢率有极显著影响(P<0.01),ME水平对粪尿氮、氮利用率、粪尿GE和GE代谢率有显著(P<0.05)或极显著(P<0.01)的影响,CP和ME水平的互作对食入氮、食入GE、粪尿GE、ME有显著(P<0.05)或极显著(P<0.01)的影响。由此可知,4~8周四川白鹅适宜的CP水平为15%,ME水平为12.13 MJ/kg。

This experiment was conducted to study the effects of crude protein (CP) and metabolizable energy (ME) levels on performance and nitrogen balance of Sichuan white geese aged from 4 to 8 weeks. Five hundred and forty healthy 22-day-old China Sichuan white geese 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 geese in each replicate. The geese were fed 9 experimental diets with three levels of ME (12.86, 12.13 and 11.43 MJ/kg) and three levels of CP (17%, 15% and 13%). The feeding experiment lasted for 35 days. Eight geese per group were picked up on the basis of individual weight immediate to the average weight of every group on day 21 of the experiment, and the geese were used in a metabolism experiment. The results showed as follows: 1) CP level had a significant effect on feed to gain ratio (P<0.05), ME level had significant effects on daily dry matter (DM) intake and feed to gain ratio (P<0.01), the interaction between CP and ME levels had a significant effect on daily DM intake (P<0.01). With CP level increasing, the consumed CP for gain per gram was significantly increased (P<0.01), the consumed ME for gain per gram was firstly decreased and then increased (P<0.01). 2) CP level had significant effects on nitrogen intake, nitrogen excretion from excrement, availability of nitrogen and availability of GE (P<0.01), ME level had significant effects on nitrogen excretion from excrement, availability of nitrogen, GE excretion from excrement and availability of GE (P<0.05 or P<0.01), the interaction between CP and ME levels had significant effects on nitrogen intake, GE intake, GE excretion from excrement and ME (P<0.05 or P<0.01). The results suggest that for Sichuan white geese aged from 4 to 8 weeks, the suitable dietary levels of CP and ME are 15% and 12.13 MJ/kg, respectively.