Hen yolk antibody (Yolkimmunoglobulins, shortly called IgY) were achieved by immunizing about 20 weeks hens using silkworm CPV as antiagen.

• 用家蚕质型多角体病毒病病原(CPV)为抗原免疫蛋鸡,对收集的卵黄液开展了体外中和和体内中和生物试验、不同免疫次数的卵黄液的阻断效果试验等,测定免疫卵黄液对CPV的防治效果。