ROSS308父母代种鸡生产性能标准(英文)

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1、PARENTSTOCKPerformanceObjectives8June200703ROSS308PARENTSTOCK:PerformanceObjectivesIntroductionThisbookletcontainstheperformanceobjectivesforRoss308ParentStockandistobeusedwiththeRoss308ParentStockManagementManual.PerformancePerformancecanbeinfluencedbymanyfac

2、torsincludingflockmanagement,healthstatusandclimaticconditions.Theseobjectivesindicatetheperformancewhichcanbeachievedundergoodmanagementandenvironmentalconditionsandwhenfeedingrecommendednutrientlevels.Poultryproductionisaglobalactivitybutacrosstheworldtherea

3、redifferingmanagementstrategiesadaptedtolocaleconomicconditions.Theobjectivesarethereforepresentedintwosections,recognisingtwodistinctstrategiesforbreedermanagementwhichcanbesummarisedas:Tohave5%productionat25weeksofage,withfirstSection1lightstimulationafter21

4、weeks(147days+)ORTohave5%productionat23weeksofage,withfirstSection2lightstimulationbefore21weeks(upto146daysofage)Theformeristhemostcommonstrategyworldwideasitgivesdistinctadvantagesinearlyeggsize,chicknumberandbroilerchickquality.Theperformanceobjectivesforth

5、isstrategyareincludedinSection1ofthisbooklet.Section2describesthestrategytoachieve5%productionat23weeksofage.Withinthetwomajorstrategiesvariationsmayoccurforavarietyofotherreasons.Forexample,feedconsumptioncanbeaffectedsignificantlybyformoffeed,energylevelandh

6、ousetemperature.Informationinthisbookletshouldnot,therefore,beregardedasaspecificationbutasa‘PerformanceObjective’.Performancelevelsgivenassumeflocksaremanagedwithseparatesexfeeding.Werecommendthatyouusetheobjectiveswhichbestrelatetoyourproductionstrategy.Allw

7、eightmeasurementsareshowninbothandtoreflectmetric(kg/g)imperial(lb/oz)theglobalnatureofthispublication.Inthetablesvaluesarerounded,thismayresultinsmallinaccuracieswhenusingtheobjectivestocalculateotherperformancestatistics.Forfurtherinformationonthemanagemento

8、fRossstock,pleasecontactyourlocalTechnicalServiceManagerortheTechnicalServicesDepartment.02June2007ROSS308PARENTSTOCK:PerformanceObjectivesContents05Section1PerformanceSummary06Sec