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1、中國(guó)農(nóng)業(yè)大學(xué)博士學(xué)位論文仔豬復(fù)合益生乳酸桿菌制劑及其作用機(jī)理的研究姓名:黃滄海申請(qǐng)學(xué)位級(jí)別:博士專業(yè):動(dòng)物營(yíng)養(yǎng)與飼料科學(xué)指導(dǎo)教師:李德發(fā)譙仕彥20030601AbstractLactobacillistrainswereisolatedfromgastrointestinal(GI)tractmucosaandscreenedouttodevelopacompIexiactobacillipreparation,whichwouldal

2、leviatepig/etweanings“essTwoanimalexperimentswereconductedtostudytheactionmodeofthepreparationinpigletsOnthebasisofstresstoleranceandprobioticcharacteristics,Lactobacillusgasseriwasselectedfrom1220strainsinstomachandLreu

3、terifromduodenum,LacidophilusfromjejunumandLye門(mén)竹eHf啪fromcolon,werealsosingledoutfrom5789intastina]strainsThebiologicalcharacteristicsoffourstraimsoflactobacillusweredeterminedandfermentationparametersoftheselactobacilliw

4、ereoptimizedbymegnsofuniformdesignLactobaeillisurvivabilityafter75Ctreatmentfor15min,pH20treatmentfor6handstoragefor1month,respectivelyweremeasuredLgasserisurvivabilityafter商℃,storage,andpH20treatmentwas72%,378/0133%,res

5、pectivelyandfermentationparameterswereasfoflows:culturetime20h,glucose110g,L,sucrose60grL,peptone30e:,yeastextract30g/L,andammoniumcitrate2g,LLreuterisurvivabilityafter75℃,storage,andpH20treatmentwas313%,855%,344%,respec

6、tivelyandfermentationparameterswereasfollows:culturetime20h,glucose10g,L,sucrose60∥L,peptone30g,L,yeastextract2嘰,andammoniumcitrate2g,LLaeidophilussurvivabilityafter75℃,storage,andpH20treatmentwas625%,59%,695%respectivel

7、yandfermentationparameterswereasfollows:culturetime20h,glucose110啦,sucrosetO班,peptone5仉,yeastextract30以,andammoniumcitrate,12班三fermentumsurvivabilityafter75“C,storage,andpH2,0treatmentwas451%,784%,809%,respectivelyandfer

8、mentationparameterswereasfollows:culturetime20h,glucose10g,L,sucrose60g,L,peptone30g,L,yeastextract30e/L,andammoniumcitrate12g,LTheoptimalratiosoffourlactobacillibacteriaincomplexpreparationweredeterminedinuniformdesignT

9、heproportionoflactobacilliisasfollows:上gasseri:Lreuteri:Lacidophilus:L枷nentum=2:3:5:2Twelvepigs(765110kgBW),weanedat28d,wereallocatedrandomlyinto2groupsOnegroupwasprovidedwithwatercontainingthepreparationandtheotherwitht

10、apwaterascontrolbeforepigletwasorallyadministeredwithEcolfonthe8thdInthefollowing7ddiarrheaindexanddiarrheaincidenceweredecreasedby66and691%respectivelyinlactobacillitreatedgroupThelactobacillisignificantlydecreasedEcoli

11、coilfoITasandaerobescountsbutincroasedIactobacilli,bifidobacteriaandanaerobescountsindigestaandmucosaofmostsectionsofGItractThirtysixpigletsweanedat28d(765109kgBW)wereallocatedrandomlyintotwogroupswithsixpenspergroupandt

12、hreepigsperpenHalfofpigletswerefedanonmedieatedbasaldietwithlactobacillipreparationandtheotherwith50mg爪gcarbadoxascontr01ThelactobacillipreparationsignificantlyimprovedpigletsADGby302%andADFIby239%comparedwithearbadox(Po

13、05)duringthefirst2wksafterweaningFromd15tod21improvedgrowthperformancewasnotobservedin1actobacinitreatedgroupThelactobacillisignificantlyincreased1aetobacilli,bifidobacteriaanaerobes,最colicoilfoITIlS,andaerobescountsindi

14、gestaandmucosaofmostsectionsofG]tractDigastibilityofnitrogenandtotalphosphoruswasonlysignificantlyincreased(P005)BUNwasdecreasedinlactobaeilligroup妒0oDTheresuItsfromtheseexperimentsshowedthatthecomplexlactobacilliprepara

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