应用自行研制的雏鸭病毒性肝炎(dvh)蜂胶灭活苗，以0。

Ducklings virus hepatitis (DVH) Propolis inactivated vaccine was applied for immunizing l-day-old ducklings, and 0.

youdao

应用自行研制的雏鸭病毒性肝炎(dvh)蜂胶灭活苗，以0。

Ducklings virus hepatitis (DVH) Propolis inactivated vaccine was applied for immunizing l-day-old ducklings, and 0.

youdao