N-氨甲酰谷氨酸对育肥猪血清及肌肉中氨基酸水平的影响

Effects of N-carbamylglutamate on amino acids levels in finishing pigs

为了研究日粮中添加不同水平N-氨甲酰谷氨酸（NCG）对育肥猪血清及肌肉中氨基酸水平的影响,选用420头日龄体重接近的＂杜×长×大＂三元杂交猪,随机分为4个处理,对照组饲喂基础日粮,其他3个试验组分别在基础日粮中添加0.05%、0.1%和0.15%的NCG,每个处理3个重复,每个重复35头,预饲期为3 d,正试期为44 d。结果显示：日粮中添加不同含量的NCG,血清中的丝氨酸、组氨酸和谷氨酰胺浓度均显著上升（P〈0.05）,精氨酸和蛋氨酸浓度呈现上升趋势,但差异不显著（P〉0.05）,添加0.1%NCG组,半胱氨酸浓度显著高于对照组（P〈0.05）;日粮中添加不同含量的NCG,肌肉中的氨基酸浓度均无显著差异（P〉0.05）,但添加0.05%NCG组氨基酸浓度及总氨基酸浓度均比对照组高（P〉0.05）。结果表明：日粮中添加NCG能够提高育肥猪血清中丝氨酸、谷氨酰胺和组氨酸的浓度,但对肉中氨基酸无显著影响。

Thepresent study was conducted to investigate the effects of N-carbamoylglutamate（ NCG） on amino acids levels in finishing pigs. 420 crossbred（ Duroc × Landrace × Yorkshire） barrows,weighing an average of（ 70±3） kg were allotted to four treatments（ the control group and the experimental groups 1,2 and 3） in a randomized block design,with 3 replicates for each group（ n = 35）. The pigs in the control group were fed with a basic diet,and those in the experimental groups were fed with basic diet supplemented with 0. 05%,0. 10% and 0. 15% NCG,respectively. The preliminary feeding period was 3 days and the test period lasted for 44 days. The results were： Compared with the data in the control group,the treatments had increased serum serine,histidine and glutamine concentrations（ P0. 05） in the finishing pigs and raised their serum arginine concentrations（ P0. 05）. In the group of 0. 1% NCG diet,the concentration of serum cysteine was significantly higher（ P0. 05） than that in the control group. The NCG addition improved the serum methionine concentration but not significantly. The NCG group showed no significant effect on the muscle amino acids concentration in the treated animals,meanwhile,the concentrations of glutamate,glycine,alanine,aspartic acid and total amino acids. To conclude,dietary NCG supplementation could raise the concentration of sulfur-containing amino acids in serum of cows,but had no significant effect on the amino acid concentration in muscle.