3.4～9.5kg超早期断奶仔猪粗蛋白质需求参数研究

试验研究饲粮不同粗蛋白质 (CP)水平 ( 1 6% ,1 8% ,1 9% ,2 0 % ,2 1 % ,2 2 % ,和 2 4 % )对 3.4～ 9.5kg超早期断奶仔猪生产性能和血清尿素氮 (SUN)浓度的影响。结果表明 :当饲粮CP水平从 1 6%升高到2 0 % ,仔猪平均日增重趋于增加 (P >0 .0 5) ,饲料转化率极显著提高 (P <0 .0 1 ) ,采食单位粗蛋白质所获得的体增重和SUN浓度无显著变化 (P >0 .0 5) ;当饲粮CP水平从 2 0 %升高到 2 4 % ,仔猪平均日增重趋于下降 (P >0 .0 5) ,饲料转化率趋于降低 (P >0 .0 5) ,采食单位粗蛋白质所获得的体增重显著降低(P <0 .0 5) ,SUN浓度极显著升高 (P <0 .0 1 )。以上结果表明 ,在满足氨基酸需要的条件下 ,3.4～ 9.5kg超早期断奶仔猪生长所需的饲粮CP水平为 2 0 %。

Study on the Crude ProteinRequirement of 3.4

84 three-way crossbred (Duroc×(Landrace×Yorkshire)), early-weaning piglets (initial BW=3.4kg) were used to evaluate the effects of different dietary crude protein (CP) levels (16,18,19,20,21,22 and 24%) on performance and serum urea nitrogen (SUN) concentration. The results showed that daily gain trended to increase (P>0.05), feed conversion increased very significantly (P<0.01). SUN concentration were similar (P>0.05) as dietary CP level increased from 16%to20%. But daily gain trended to decrease (P>0.05), feed conversion trended to decrease (P>0.05), SUN concentration increased very significantly (P<0.01) as dietary CP level increased from 20% to 24%. It was concluded that dietary CP requirement of 3.4～9.5 kg early-weaned piglets was 20%.