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The production parameters of the Barbados Blackbelly and crossbred sheep in a controlled semi-intensive system

机译:半精养系统中巴巴多斯黑腹羊和杂交羊的生产参数

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AstudywasconductedattheLivestockFarmoftheNationalAgriculturalResearchInstitute,MonRepos,EastCoastDemerara,Guyana,betweenJanuary2000andJuly2003,toevaluatetheproductionparametersoftheBarbadosBlackbellyandcrossbredsheepinacontrolledsemi-intensiveproductionsystem.Thedatawereobtainedfromacomprehensiverecordkeepingsystemusedduringthestudy.Theanimalswereseparatedintotwogroupsasitrelatestobreed,theBarbadosBlackbellyandthecrossbredbreedsofsheep.Thedamswereplacedintogroupsbasedontheirage1-2years,2-3,3-4,4-5and5yearsofage,toevaluatethebirthweightoflambsborntodamswithintheirageranges.Younglambswereevaluatedontheirbirthweightandweaningweighttoyearlings.Otherparametersevaluatedwereaveragedailygains,atthepreandpostweaningstagesofgrowthforthetwobreedtypes,birthtypesexpressedasapercentageoftotallambsbornaswellaspreandpostweanedmortality.Therewerenodifferencesinliveweight,(P0.05)betweenthetwobreedtypeswhencomparisonsweremadeseparatelyforsexatthedifferentintervals.Theseincludebirthweight,weaningweightat90daysandweightsatboth180and270days.Therewerenodifferencesinbirthweightsamongsexesatthedifferentageranges.Femalelambs,however,hadlowerbirthweightsinthe3-4yearsand5yearsagerangewhencomparedtothe1-2year,2-3and4-5yearrange.BasedontheLSDtest,nodifferences(P0.05)couldbedetectedbetweenthetwobreedtypesformalesinrelationtotheaveragedailygainsoftheanimalsatpreandpost-weaningstages.ThepercentsinglebirthsweresignificantlyhigherforthecrossbredsheepwhencomparedtotheBarbadosBlackbelly;thistrendwashoweverreversedwhencomparisonsweremadefortwinbirths.
机译:AstudywasconductedattheLivestockFarmoftheNationalAgriculturalResearchInstitute,Monrepos的,EastCoastDemerara,圭亚那,betweenJanuary2000andJuly2003,toevaluatetheproductionparametersoftheBarbadosBlackbellyandcrossbredsheepinacontrolledsemi-intensiveproductionsystem.Thedatawereobtainedfromacomprehensiverecordkeepingsystemusedduringthestudy.Theanimalswereseparatedintotwogroupsasitrelatestobreed,theBarbadosBlackbellyandthecrossbredbreedsofsheep.Thedamswereplacedintogroupsbasedontheirage1-2years,2-3,3-4,4-5and 5yearsofage,toevaluatethebirthweightoflambsborntodamswithintheirageranges.Younglambswereevaluatedontheirbirthweightandweaningweighttoyearlings.Otherparametersevaluatedwereaveragedailygains,atthepreandpostweaningstagesofgrowthforthetwobreedtypes,birthtypesexpressedasapercentageoftotallambsbornaswellaspreandpostweanedmortality.Therewerenodifferencesinliveweight,在不同的时间间隔进行比较时,两种犬种之间的差异(p <0.05)。 ghtat90daysandweightsatboth180and270days.Therewerenodifferencesinbirthweightsamongsexesatthedifferentageranges.Femalelambs然而,hadlowerbirthweightsinthe3-4yearsand 5yearsagerangewhencomparedtothe1-2year,2-3and4-5yearrange.BasedontheLSDtest,nodifferences(PLT; 0.05)couldbedetectedbetweenthetwobreedtypesformalesinrelationtotheaveragedailygainsoftheanimalsatpreandpost-weaningstages.ThepercentsinglebirthsweresignificantlyhigherforthecrossbredsheepwhencomparedtotheBarbadosBlackbelly; thistrendwashoweverreversedwhencomparisonsweremadefortwinbirths。

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