A.精神亢奮 B.輕度至重度呼吸道癥狀 C.采食量下降 D.蛋雞產(chǎn)蛋量下降
A.Avian InfluenzaB.Avian Leukosis VirusC.Newcastle DiseaseD.Marek’s Disease
A.水泥 B.生石灰 C.塑料膜 D.碎木屑