谷氨酰胺对早期断奶仔猪生长性能和免疫性能的影响

Effect of Glutamine Supplementation on the Growth Performance and Immunity of Early Weaned Piglets

研究了不同水平的谷氨酰胺对断奶仔猪生产性能、免疫功能的影响。试验选用80头28±1d断奶、体重为6.16±0.13 kg的长白×约克夏仔猪,按单因素完全随机化设计随机分为5个处理,日粮中谷氨酰胺的添加量分别为0、0.3%、0.6%、0.9%和1.2%。试验期21 d。在断奶后7 d1、4 d2、1 d测定生产性能和淋巴细胞转化率,同时在断奶后7 d,每处理选4头仔猪免疫卵清白蛋白(OVA),于免疫前和免疫后第7天和第14天前腔静脉采血测定血清OVA抗体水平。结果表明:①随着谷氨酰胺添加量的增加,早期断奶仔猪日增重、日采食量提高(P≤0.05),料肉比下降(P>0.05);②谷氨酰胺能提高早期断奶仔猪淋巴细胞转化率和特异OVA抗体效价,提高仔猪的免疫性能;③综合生长性能与免疫性能,谷氨酰胺的最佳添加剂量为1.2%。

This study investigated the effects of glutamine on the growth performance and Immunity in early-weanling piglets . Eighty crossbred piglets （Landrace × Yorkshire ） weaned at 28±1 days of age, were divided into 5 treatments based on weight and gender. Piglets in treatments were fed diets supplemented with 0. ,0. 3%,0. 6%,0. 9%,1. 2% glutamine, respectively. On 7 th,14 th and 21 th, growth performance and T lymphocyte proliferation rate were measured. Four pigs per treatment were injected with 1 mg/kg body weight of OVA. Serum samples were collected before injection and the 7th and the 14th after injection to analysis of OVA antibody level. The experiment showed：（1）Dietary supplements of glutamine could significantly increased average daily gain, average daily feed （P≤ 0.05）,and decreased feed/gain; （2）Glutamine significantly improved immune ability of early-weaned piglets（P≤0.05）. （3）Optimum supplemental level of glutamine dipeptide in diet for weaned piglets were 1.2 mg/kg.