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1、AstudyonthevariationoffeedefficiencyinstationtestedbeefbullsM.F.Liu1,L.A.Goonewardene2,D.R.C.Bailey3,J.A.Basarab4,R.A.Kemp5,P.F.Arthur6,E.K.Okine4,andM.Makarechian71AgriTechInternationalCorporation,11EdgelandMewsNW,Calgary,Alberta,CanadaT3A4C9(e-mail:Liumf@mcafeemail.com);2AlbertaAgriculture,Foodand
2、RuralDevelopment,Edmonton,Alberta,CanadaT6H5T6;3AgricultureandAgri-FoodCanada,LacombeResearchCentre,Lacombe,Alberta,CanadaT4L1W1;4WesternForage&BeefGroup,LacombeResearchCentre,Lacombe,Alberta,CanadaT4L1W1;5AgricultureandAgri-FoodCanada,LethbridgeResearchCentre,Lethbridge,Alberta,CanadaT1J4B1;6NSWAgr
3、iculture,AgricultureResearchCentre,Trangie,NSW,Australia2823;7UniversityofAlberta,Edmonton,Alberta,CanadaT6G2P5.Received9April1999,accepted27April2000.Liu,M.F.,Goonewardene,L.A.,Bailey,D.R.C.,Basarab,J.A.,Kemp,R.A.,Arthur,P.F.,Okine,E.K.andMakarechian,M.2000.Astudyonthevariationoffeedefficiencyinsta
4、tiontestedbulls.Can.J.Anim.Sci.80:435–441.Therecordsof282youngbeefbullsfromeightbreedstestedfromNovember1981toApril1987attheEllerslieBullTestStation,Alberta,Canada,wereusedtostudythevariationinfeedefficiencyamongyoungperformance-testedbulls.Considerablevariationexistedamongtheanimalsinbothresidualme
5、tabolizableenergyconsumptionandresidualdrymatterconsumption.Theheritabilityestimatesforresidualmetabolizableenergyconsumptionandresidualdrymatterconsumptionwere0.33and0.29,respectively.Inaddition,residualmetabolizableenergyconsumptionandresidualdrymatterconsumptionweremoderatelycorrelated(r=0.43)wit
6、hcon-ventionalfeed-to-gainratio,indicatingthatconventionalfeed-to-gainratioonlyaccountedfor18%ofthevariationinresidualmetabolizableenergyconsumptionorresidualdrymatterconsumption.Itwas,therefore,worthwhiletouseresidualmetabolizableenergyconsumptionorresidualdrymatterconsumptionasseparatemeasuresoffe
7、edefficiency.Forrapidimprovementinfeedefficiencyinbeefcattle,selectionpressureshouldbeappliedtobothgrowthtraitsandresidualenergyconsumptionorresidualdrymatterconsumption.Multi-traitoptimumrestrictedse
