影響苜蓿青貯品質(zhì)的主要因素及苜蓿青貯在奶牛日糧中應(yīng)用效果的研究.pdf

1、中國(guó)農(nóng)業(yè)大學(xué)博士學(xué)位論文影響苜蓿青貯品質(zhì)的主要因素及苜蓿青貯在奶牛日糧中應(yīng)用效果的研究姓名：許慶方申請(qǐng)學(xué)位級(jí)別：博士專業(yè)：草業(yè)科學(xué)指導(dǎo)教師：韓建國(guó)玉柱20051001Abstract1rheeffectofaddingpreviousfermentedjuice(orformicacid)onbaledalfalfastageduringdifferentstoringtime，bywhichdeterminedthechemicalc

2、ompositionandlaerieacidbacteriaofalialfamaterialandthepH，organicacidcontent，nutritionalcompositionofbaledalfalfasilage，andreplacingcornsilagewithbaledalfalfasilageondairycowsproductionperformanceandphysiologicalmetabofis

3、，werestudiedAdoptingrandomdesign，thefourthcutunchoppedalfalfawerebaledsilagesprayingwithdistilledwater，61／tformicacid，or02％previousfermentedjuiceEvery3balesofeachtreatmentwereuncoveredatone，eighI，eighteen，andtwenty—sixwe

4、eks，senseevaluationandsamplingdeterminationtheDMcontent，pH，organicacid，nutritionalcompositionandbuffercapacity’andtheIVDMDofalfalfamaterialandthealfalfasilageafterstoredtwentysixweeksweredeterminedAddingpreviousfermented

5、juicepreventedmouldalfalfasilage，decreasedpHandbutyricacidcontent，andincreasedlacticacidandaceticacidcontentandtheNDFcontentdecreased10％andIVDMDincreased5％Thepreviousfermentedjuicedilutedwith20timeswaterwaseffectsasdilut

6、edwith5timeswaterThefirstorseconddirectcutorwiltedalfalfawerebaledsilagewithadding02％previousfermentedjuiceAfterstored45，90，and300d，thebaledalfalfasilagewmuncoveredandsampledtoanalyzeThefirstcutbaledalfalfasilagewerestab

7、lestoredwhentheDMcontentwerebetween25％to30％，andthehighDM(above40％)baledalfalfasilageweremouldafterstored300dandtheCPcontentlowerandthefibercontenthigherthanthelowDMbaledalfalfasilageThesecondcutalfalfawasnotmouldbutthebu

8、tyricacidcontentwagmorecumulatedinhighmoisturebaledalfalfasilageThefirstcutalfalfamaterialCPcontentand1、，DMDdecreasedandNDFandADFcontentincreasedwithwiltedThelVDMDdecreasedafterstored45dand90dandincreasedtafterstored300d

9、TheaerobicstabilityofbaledalfalfasilageandwholecropCOITIsilageandtheirtotalmixedrationswerestudiedusingC02gasproductionmethodandlacticacidbacteria，yeast，mould，andclostridiacultivationmethodTheextentofpHvariation，DMloss，a

10、ndC02gasproductionwerelowerinbaledalfalfasilage，andthenmoreaerobicstabilitythancornsilageAdoptingrandomdesign，theeffectofreplacementwholecropcmnsilagewithbaledalfalfasilage，whichwereO％，”％，and54％，respectivelyandwithorwith

11、outfullfatextrudedsoybeaninthedietsondairyCOWSproductionperformanceandphysiologicalmetabolismwerestudiedusing60cowsneNDFADEAshcontentandIvDMDweresimilar，andtheEEcontentincreasedftom4％to5％andtheCPcontentincreasedfrom161％t

12、o166％and169％TheDMlwerenotdifferentbetweendairyCOWSofSiXtotalmixedrationsReplacementcoinsilagewithbaledalfalfasilageincreasedmilkyieldO97kg／dand19kg／d，milkfatyield11g，dand47g，d，milkproteincontent3％and5％，andmilkproteinyiel

13、d41g／dand101g，d，andSNFcontentfrom820％lo827％and841％，notdifferofmilkfatcontent，milkglucosecontent，andSCCMUNandBUNincreasedTheplasmaNEFAandbloodglucosecontentdidn’tdifferwithbaledalfalfasilageAddingfullfatextmdedsoybeandidn

14、’taffectthemilkyieldandmilkcompositionTheMUNandplasmaNEFAincreasedwithaddingfullfatextrudedsoybeansReplaewmentpartofwholecropcornsilagewithalfalfasilageincreasedhighyieldCOWSproductionKeywords：Baledalfalfasilage，Previous