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ID:36861949
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页数:15页
时间:2019-05-16
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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
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