中文摘要：

为了探讨N-氨甲酰谷氨酸（N-carbamylglutam ate,NCG）对环江香猪生长性能、营养物质消化率及血浆游离氨基酸含量的影响,试验选用平均体重为（12.6±1.7）kg的环江香猪10头,随机分为2组,每组5个重复,每个重复1头猪,单笼饲养,分别饲喂基础饲粮和添加0.1%NCG的试验饲粮,试验期为10d。每日记录采食量,分别在试验开始和结束时称取试猪空腹体重;试验第8~10天收集粪样,用外源指示剂（T iO2）法测定常规营养物质的表观消化率;试验第10天采集血样,测定血浆中生化指标和氨基酸含量。结果表明,与基础饲粮组相比,0.1%的NCG添加组平均日增重显著升高（P〈0.05）,料重比显著降低（P〈0.05）;粗蛋白质、粗脂肪和干物质表观消化率均有所升高（P〉0.05）;血浆尿素氮、血氨和低密度脂蛋白含量均显著降低（P〈0.05）,碱性磷酸酶活性显著升高（P〈0.05）;血浆总氨基酸、必需氨基酸、芳香族氨基酸、苯丙氨酸和蛋氨酸含量均显著升高（P〈0.05）。上述结果提示,饲粮中添加0.1%的NCG可促进机体对营养物质的消化吸收,改善机体氨基酸平衡,从而提高环江香猪的生长性能。

英文摘要：

This study was conducted to determine effects of N-carbamylglutamate（NCG） on growth performance,nutrient digestibility and plasma free amino acid concentrations in growing pigs.Ten Huanjiang mini-pigs with an average body weight（BW） of（12.6±1.7） kg were used and randomly assigned into two groups（five replicates with one pig per replicate）,representing supplementation with 0 or 0.1% NCG in a basal diet for 10 days.Daily feed intake,initial and final BW were recorded,respectively;fecal samples were collected from day 8 to 10 for determining the digestibility of routine nutrients by TiO2 indicator;blood samples were collected on day 10 for analyzing biochemical parameters and concentrations of free amino acids（AA）,respectively.Results showed that compared with the basal diet group,0.1% NCG supplementation significantly increased the average daily gain（P0.05）,and decreased the ratio of gain to feed（P0.05）.The apparent digestibility of crude protein,crude fat and dry matter were increased（P0.05）.Plasma alkaline phosphatase activity was significantly increased（P0.05）,while the plasma concentrations of urea nitrogen,ammonia and low-density lipoprotein were significantly decreased（P0.05）.The plasma concentrations of total amino acid,essential amino acid,aromatic amino acid,phenylalanine and methionine of pigs fed the diet supplemented with 0.1% NCG were higher than those of pigs fed the basal diet（P0.05）.These findings suggest that 0.1% NCG supplementation can promote the digestibility of nutrients,improve AA balance,and then increase the growth performance,which may provide some scientific information for the application of NCG in diets of Huanjiang mini-pigs.