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鸡生理解剖图鸡的内脏图UpperRespiratoryTractGlottisGlottisTracheaLungsTracheaPrimaryBronchiSyrinxLarynxLarynxTongueTongueChoanaChoanaInfraorbitalSinusHarderianGlandNasalLacrimalDuctCiliaCiliatedepithelialcellsGobletcells(mucusglands)TrachealLiningCellsCaudalThoracic(Paired)AvianAirSacCervical(Paired)Clavicular(Single)CranialThoracic(Paired)Abdominal(Paired)MovementofairthroughthelungandairsacsFigure4Inspiration/ExpirationCervicalClavicularCaudalThoracicAbdominalCranialThoracicInpirationExpirationJOB203-RESPIRATORYILLUSTRATIONSARCHIVEDISK4/MARKETING/GAINESVILLE鸡群呼吸系统疾病的成因—各致病因素的相互作用肝脏上呼吸道大肠杆菌：正常1015个/支粪便，15%见致病性前后摆动的纤毛将进入呼吸道的E.coli排出去(覆盖全部脏器的气囊)腹腔脏器1)无疫苗反应2)无呼吸道感染(ND,IB)3)无或少氨气4)无或少应激5)无其它疾病肺脏鸡群呼吸系统疾病的成因—各致病因素的相互作用肝脏上呼吸道大肠杆菌：正常1015个/支粪便，15%见致病性前后摆动的纤毛将进入呼吸道的E.coli排出去(覆盖全部脏器的气囊)腹腔脏器1)无疫苗反应2)无呼吸道感染(ND,IB)3)无或少氨气4)无或少应激5)无其它疾病肺脏