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1、CSIROPUBLISHINGwww.publish.csiro.au/journals/ajeaAustralianJournalofExperimentalAgriculture,2007,47,1119–1127Genotypeandageeffectsonsheepmeatproduction1.ProductionandgrowthD.L.HopkinsA,B,D,D.F.StanleyB,L.C.MartinBandA.R.GilmourCAAustralianSheepIndustryCooperativeResearchCen
2、tre,Armidale,NSW2350,Australia.BNSWDepartmentofPrimaryIndustries,CentreforSheepMeatDevelopment,Cowra,NSW2794,Australia.CNSWDepartmentofPrimaryIndustries,OrangeAgriculturalInstitute,Orange,NSW2350,Australia.DCorrespondingauthor.Email:David.Hopkins@dpi.nsw.gov.auAbstract.Theg
3、rowth,woolproductionandteetheruptionofanimalsfromfivegenotypes[PollDorset(PD)×growthgBorderLeicester×Merino(BLM);PD×Merino(M);PollDorset(PD)×M;M×M;BL×M]wereevaluatedgmusclingmovertheagespanof4to22monthsofage.Intotal,16sireswereusedtogeneratetheanimalsandthesewereselectedfor
4、growthbasedonestimatedbreedingvalues(EBVs),apartfromonegroup(PD)whichwasselectedformusclingbasedmonEBVs.Intotal,595animalswereslaughteredat4,8,14or22monthsofage.ThebirthweightoflambsborntoBLMeweswas0.6kgheavier(P<0.001)thanthoseborntoMerinoewes,andwetherlambswere0.2kgheavie
5、rthanewelambs(P<0.001).Theyearlingweight(YWT)EBVhadnoeffectonbirthweight.Thereweresignificant(P<0.001)differencesbetweengenotypesforpredictedweaningweightat4monthsofage,witharangeof10.6kgamongthegroups.ThePD×BLMweretheheaviest(37.8±0.7kg)andtheMerinothelightest(27.3±0.8kg).
6、Wetherlambswere2.0kgheavierg(P<0.001)thanewelambsatweaning.TheYWTEBVhadnoeffectonweaningweight.Therewasasignificant(P<0.001)interactionbetweentheageatslaughterandgenotypeforfinalliveweightofeachagegroup.ThePD×BLMgweretheheaviestateachageandtheMerinosthelightest,andfortheold
7、estanimals,theBLMweresignificantly(P<0.05)heavierthanPD×M,whereasatyoungeragesthiswasnotthecase.Thesignificantinteraction(P<0.001)mbetweensexandageatslaughterreflectedtheincreasingdifferenceinliveweightbetweenthesexesasageatslaughterincreased.Therewasalsoasignificant(P<0.05
8、)interactionbetweentheYWTEBVandageatslaughter.Theoverallcoefficientswere–0.01,0.14
