This study was conducted to investigate the effects and potential mechanisms of dietary N-carbamylglutamate(NCG) supplementation during late gestation on the reproductive performance of sows.Thirty-two Landrace × Large White sows on d 80 of gestation were assigned randomly to 4 groups(control group and experimental group 1,2,3),8 replicates in each group.Sows in the control group were fed with basic diet,and those in the experimental groups were fed with basic diet supplemented with 0.04%,0.08% and 0.12% NCG.Blood samples were obtained on d 110 of gestation to examine the plasma concentration of free amino acids,NO,NOS,hormones and biochemical indices.The results showed that supplementation with 0.08% NCG increased the number of piglets born alive by 11.75%(10.75 vs.9.62,0.05P0.1) and live litter birth weight by 13.23%(16.52 kg vs.14.59 kg,P0.05),decreased piglets born dead per litter by 57.14%(0.75 vs.1.75,P0.05) and plasma urea nitrogen concentration compared with the control group,and increased plasma concentration of arginine,NO,NOS,growth hormone and Zn+ too(P0.05).0.04% and 0.12% NCG enhanced the reproductive performance of sows.The result suggest that dietary NCG supplementation could enhance reproductive performance of sows,and the potential mechanisms is that the supplemented NCG increases endogenous arginine synthesis in sows,so as to improve intrauterine environment and fetal nutrition,and guarantee fetus survival and growth.

为了研究精氨酸和精氨酸生素(AAA)对哺乳母猪泌乳及其仔猪生长性能的影响,试验选用体重和胎次相近的长×大母猪35头,随机分成5组,每组7个重复.对照组饲喂基础日粮,其余4组分别在饲喂基础日粮中添加0.8%精氨酸(Arg),0.03%、0.06%、0.09%AAA.正式试验于妊娠107d开始,并于母猪生产时耳缘静脉采血分离血浆检测生化指标.试验结果表明,Arg组相对于其余各组显著提高了21日龄仔猪断奶窝重(P＜0.05)和日均泌乳量(P＜0.05);0.03%AAA组相对于对照组有提高仔猪断奶窝重和断奶均重的趋势(0.05＜P＜0.1),相对于对照组和0.09%AAA组显著提高了仔猪平均日增重(P＜0.05),而Arg组相对于对照组有提高的趋势(0.05＜P＜0.1).与对照组相比,0.06%AAA降低了BUN的含量(P＜0.05),0.8%精氨酸组亦有降低的趋势(0.05＜P＜0.1).日粮中分别添加0.8%精氨酸和0.03%、0.06%精氨酸生素提高了母猪日均泌乳量、仔猪断奶窝重和断奶均重.