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1、J.DairySci.93:1523–1533doi:10.3168/jds.2009-2511??AmericanDairyScienceAssociation,2010.AssociationsbetweenbovinecoronavirusandbovinerespiratorysyncytialvirusinfectionsandanimalperformanceinSwedishdairyherds1F.Beaudeau,*??A.Ohlson,?andU.Emanuelson?*Ecole
2、NationaleVétérinairedeNantes,UMR1300Bio-agression,EpidémiologieetAnalysedeRisque,F-44307,Nantes,France?INRA,UMR1300Bio-agression,EpidémiologieetAnalysedeRisque,F-44307,Nantes,France?DepartmentofClinicalSciences,DivisionofRuminantMedicineandEpidemiology,
3、SwedishUniversityofAgriculturalSciences,SE-75007,Uppsala,SwedenABSTRACTanimalsfrominfectedherdscomparedwiththoseininfection-freeherds.ToassesstheeconomicimpactofbovinecoronavirusKeywords:dairycattle,animalperformance,bovine(BCV)andbovinerespiratorysyncy
4、tialvirus(BRSV)coronavirus,bovinerespiratorysyncytialvirusinfections,accurateestimatesoftheirassociatedeffectsonanimalperformanceareneeded.ThisstudyaimedtoINTRODUCTIONquantifythevariationinindividualtest-daymilkyieldandsomaticcellcount,riskofreproductiv
5、efailureafterBovinecoronavirus(BCV)andbovinerespiratoryfirstserviceofdairycows,andriskofdeathofcalvessyncytialvirus(BRSV)aretwoviruseswithworldwideandheifersaccordingtotheBCVandBRSVstatusofdistributionthatarefrequentlyinvolvedintherespira-theherd.Threet
6、ypesofstatusweredefinedforBCVtoryandentericdiseasecomplexesofcattle(Clark,andBRSVinfections,basedon1)thedynamicsovera1993;ValarcherandTaylor,2007).Bovinecoronavirus7-moperiodofBCV-andBRSV-specificantibodylevelshasbeendescribedtobeinvolvedinwinterdysente
7、ryinpooledmilkofprimiparouscows;2)thepossibleoc-inadults(Saif,1990;Aleniusetal.,1991),calfdiarrheacurrenceofpresumablyBCV-andBRSV-relatedclini-(Stairetal.,1972),andinrespiratorydiseaseofyoungcaloutbreaks;and3)thecombinationofbothpiecesstock(McNultyetal.
8、,1984).Bovinerespiratorysyn-ofinformation.Atotalof36,184testdays,2,716cowscytialvirusisrecognizedasoneofthemostimportantwithafirstservice,and4,104calvesandheifersin65causesofrespiratorytractdiseaseinbeefanddairySwedishherdswerein
