【摘要】 用分组饲养试验和代谢试验方法研究用等能量饲粮,不同粗蛋白(CP)水平对公绍鸭12周龄前生长和CP利用能力的影响,结果表明:在前3周内日增重随周龄提高近直线上升,5至6周出现高峰;增重与饲粮CP％、CP采食量间,前3周均呈显著正相关(P≤0.05),以后则在Ⅰ到Ⅳ组范围内呈显著负相关(P<0.05),而CP％最低的Ⅴ组不受周龄影响;测得氮存留率为27.4—55.5叻,平均41.5％;公绍鸭生长对CP水平的要求,前3或4周约20—22％,第4—8周15％或略高,其后降至13—14％;公绍鸭养作肉用,在6周龄前后上市可望获利,但此时体重尚轻,到8周龄后,因饲料耗用比过高,只宜进行牧饲或散养。更多还原

【Abstract】 This study was conducted in Shao-ya diaklings,a laying type duck,to determine its abilities of meat production and feed protein utilization before 12 weeks of age.In the grouped feeding trial and nitrogen(N)balance test,five isoenergetic diets(2950 kcal calculated ME/kg as fed)were used.The crude protein(CP)quality was essentially the same,and their contents were 27.5,23.0,18.4,15.2,and 12.0,respectively.The results were as follows.The growth rate of draklings increased almost linearly during the first 3 weeks,and reached a peak of only about 20 g/d in 5-6 weeks,and then decreased rapidly.A significant correlation was found between growth and diet CP% or CP consumption of the birds(p<0.05),but it was positive for the first 3 weeks and became negative thereafter in the CP rang eof 27.5-15.2%.N balance was significantly affected by diet CP% and the ducks age,however it was not affected by age when diet CP was 12.0%.The obtained N balance was 27.4-55.5%,with an average of 41.5%.CP requirements for adequate growth of the duck were about 20-22%,15% or slightly more and 13-14%,respectively,for the first 3 or 4 weeks,4-8 weeks and after 8 weeks,更多还原