断奶仔猪养殖英文资料

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1、WeanerPigChap0126/9/012:01PMPage11GrowthoftheYoungWeanedPigC.T.WhittemoreandD.M.GreenUniversityofEdinburgh,King’sBuildings,EdinburghEH93JG,UKThePotentialforGrowthWithouthumanintervention,thepigwillbecomenutritionallyindependentofitsdamat15–20kgliveweight.Natur

2、alweaningwilloccurat70daysorsoofage.Earlierweaningthanthiscreatesadisruptiontothegrowthoftheweanedpigthatisinverselyproportionaltopigage.Thecompetenceofthedigestivesystemofthesuckledpigtohandleanon-milkdietbeginstodevelop(aidedbychallenge/response)between14and

3、28daysofage.Underconditionsofgradualdietchangefromliquidtosolidfeed,growthislikelytobefullysupportablewithoutsuckedmilkfromaround56days.Thepresentationofamixtureofmilkandexter-nallysourcedsolidfeedtothegutoftheyoungpigisrelevanttonaturaldevelopment.Abruptweani

4、ngat21daysofageisnotconducivetotheachievementofnormalgrowthinpigs.Fiftyyearsago,conventionalEuropeanpracticewastoweanat56daysofage.Advancesinnutritionalknowledgeandthemanufactureofspecialisthousingforyoungpigsledtoarapidreductioninweaningage.Afteranumberoffail

5、edflirtationswith7-day,10-dayand14-dayweaning,the‘industrystandard’intheUKsettledat21-dayweaning.Asubstantialproportionofsuccessfulpractitionersneverthelesschosenottoweanatagesbelow28days,andinotherEuropeancountries35-dayweaningremainscommon.TheUKindustrystanda

6、rdhas,sincethe1980s,driftedupwardfrom21daystowards28days,withanapparentadvantageintermsofnumbersofpigsbornpersowperyear.Thedescriptionofgrowthfollowingweaningrequiresatitscoreapredictionofproteinmassandofitsincrementation.Descriptionofbodycompositionfurtherreq

7、uiresquantificationoflipidmassandanunderstandingofanyrelationshipthatmayexistbetweenproteinandlipidretentioninthecourseofpositive(and,inthecaseoftheweanedpig,negative)growth.©CABInternational2001.TheWeanerPig:NutritionandManagement(edsM.A.VarleyandJ.Wiseman)1We

8、anerPigChap0126/9/012:01PMPage22C.T.WhittemoreandD.M.GreenTheoreticalconsiderationsThereisdissentoverthenatureofthecurvethatmightbestdescribeproteingrowthovertimeandweight.Theconve