Weaning piglets were fed with specific egg yolk immunoglobulin (IgY)antibodies against porcine reproductive and respiratory syndrome virus (PRRSV)and porcine circovirus type 2(PCV-2)-Cap protein, of which on growth performance and immunity was investigated.The results indicated that PRRSV and PCV-2 antibody negative rate was higher 15% and 5% in 0.5% groups than that of in blank groups at 53 days of age,respectively.Compared with blank groups,S/P average value of positive PRRSV antibody ti-ter in 0.5% groups decreased 15.59% and 24.53% over 53 and 60 days of age,respectively.During 46 to 60 days of age,SP average value of postive PCV-2 antibody titer of 0.5% groups were lower 15.42%, 19.66%and 12.70% than that of in blank groups,respectively.Compared with blank groups,finial body weight,daily weight gain and survival rate of 0.5% groups were improved 12.74% (P < 0.01),16.90%(P < 0.01)and 1.67% at weaning piglets,respectively.The expressions of PRRSV antigen in 0.5%groups were abolished in jejunum and small intestine with immunohistochemistry analysing,compared with the blank groups.The special IgY additive could provide a novel alternative approach to prevent and control diseases caused by PRRSV and PCV-2 infection in pigs.%应用特异性抗猪繁殖与呼吸综合征病毒（PRRSV）和猪圆环病毒2型（PCV-2）Cap 蛋白卵黄免疫球蛋白（IgY）饲喂保育猪，观察其对保育猪生长和免疫性能的影响。经抗体检测表明，53日龄时，PRRSV和 PCV-2抗体阴性率0．5％，试验组比对照组分别高15％和5％。在53日龄和60日龄时，保育猪 PRRSV阳性抗体 S/P 均值，试验组比对照组分别低15．59％和24．53％。保育猪46日龄～60日龄之间，阳性 PCV-2抗体 S/P 均值试验组比对照组分别低15．42％、19．66％和12．70％。保育猪转栏时，试验组比对照组平均末重高12．74％（P ＜0．01），平均日增重提高16．90％（P ＜0．01），成活率高1．67％。免疫组化结果显示，相对于空白组，添加组空肠和小肠组织中的 PRRSV 抗原的阳性表达几乎为0。试验结果为特异性抗体用于PRRSV 和 PCV-2的防控提供了参考。
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