Rumen microorganisms as providers of high quality protein
[摘要] Ruminantsobtainthemajorityofessentialnitrogenfrommicrobialdegradationofdietaryproteinwithintherumenandthesubsequentincreaseinmicrobialbiomass.Microbialproteingeneratedbytheincreaseinbiomassisthemainsourceofproteinnitrogenfortheanimal.Thesupplyofmicrobialproteinmaythereforebeadverselyaffectedbyvariousenvironmentalorbacterialfactors.Polyphenolicplantproductsintropicallegumescancomplexwithdietaryorbacterialproteinandinhibitmicrobialgrowth.Celluloseorlignocellulosepresentintropicalgrassesorotherforagesmayrestrictbacterialaccesstoplantprotein.Theaminoacidcompositionofbacterialproteinmaynotalwaysbeadequatetosupportrapidanimalgrowthandhighlevelsofanimalproduction.Wehaverecentlyisolatedaphenolicacid-resistantmicrobialpopulationfromtherumencontentsofferalgoats.Whenintroducedintotherumenofsheep,thispopulationenhancesproteinsupplyandyieldssubstantialincreasesinanimalproductivityontannin-containingfeeds.WehaveclassifiedoneorganismfromthismixtureasStreptococcuscaprinusandshowthatitcanbemaintainedinsheepatapopulationof105cfu/mlofrumenfluid.
[发布日期] [发布机构]
[效力级别] [学科分类] 农业科学（综合）
[关键词] [时效性]
