Hen egg yolk antibody (Yolk immunoglobulins,shortly called IgY) were achieved byimmunizing about 20 weeks hens using silkworm DNV as antiagen.

• 用家蚕浓核病病原(DNV)免疫蛋鸡,收集的卵黄通过体外中和和体内中和生物试验测定鸡免疫卵黄对DNV的防治效果。