本研究旨在探讨在饲粮中添加紫苏籽提取物（PSE）对育肥牛生产性能和免疫功能的影响。选择体重为(376.7±37.0) kg的西杂阉公牛19头，随机分为2组，对照组10头，PSE组9头。对照组饲喂基础饲粮，PSE组饲粮为基础饲粮中添加0.03% PSE。结果表明：1)在育肥牛饲粮中添加PSE使日增重和干物质采食量分别提高8.5%和3.2%，干物质料重比下降5.8%，但与对照组相比差异不显著(P＞0.05)；2)总磷的表观消化率提高了56.11%(P＜0.05)，而对其他养分的表观消化率无显著影响(P＞0.05)；3)血浆中磷和α-淀粉酶浓度及免疫球蛋白A(IgA)含量分别提高16.22%、20.92%和4.48%(P＜0.05)；4)肌肉剪切力值降低13.00%(P＜0.05)，胴体性状等级提升1个等级。结果提示：饲粮中添加PSE对育肥牛生长性能没有产生负面影响，可促进磷的消化，可提高血中磷和α-淀粉酶浓度及IgA的含量，并改善牛肉嫩度和胴体品质。

This study was conducted to investigate the effects of perilla seed extracts (PSE) on performance and immune function of finishing cattle. Nineteen Simmental crossbred steers with (376.7±37.0) kg of BW were divided into 2 groups, ten heads in control group, and nine heads in PSE group. Control group was fed the basal diet, and PSE group was fed the basal diet supplemented with 0.03% PSE. The results were showed as follows, 1) dietary supplementation of PSE increased the average daily gain (ADG) and average daily daily dry matter intake (ADMI) by 8.5% and 3.2%, respectively, and decreased the ADMI to ADG ratio by 5.8%, but the differences were not significant (P＞0.05); 2) the apparent digestibility of total phosphorus increased by 56.11% (P＜0.05), however, the apparent digestibility of other nutrients was not affected (P＞0.05); 3) the plasma phosphorus, alpha-amylase concentrations and IgA content increased by 16.22%, 20.92% and 4.48%, respectively (P＜0.05); 4) shear force of beef reduced by 13.00% (P＜0.05), and the carcass quality was improved by one grade. The results indicate that dietary supplementation of PSE has no adverse effects on growth performance, and can stimulate the phosphorus digestibility, increase the concentrations of plasma phosphorus, alpha-amylase and IgA content, and improve the beef tenderness and carcass quality.［Chinese Journal of Animal Nutrition，2011，23（3）：473-479］