生长肥育猪的蛋白质与氨基酸营养

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1、ProteinandAminoAcidNutritionofGrowingandFinishingPigs生长肥育猪的蛋白质与氨基酸营养RobertA.Easter,Ph.D.ProfessorofSwineNutritionDean,CollegeofAgricultural,ConsumerandEnvironmentalSciencesUniversityofIllinoisIntroductoryFacts:Proteinsaremadeupofaminoacids蛋白质由氨基酸组成Aminoacids

2、areeitheressential(mustbepresentinthediet)ornonessential(canbemadebytheanimal).氨基酸分为必需（日粮中必须有）和非必需（动物可自体合成）The10essentialaminoacidsare十种必需氨基酸是:-Lysine赖氨酸-Leucine亮氨酸-Tryptophan色氨酸-Isoleucine异亮氨酸-Methionine蛋氨酸-Histidine组氨酸-Threonine苏氨酸-Phenylalanine苯丙氨酸-Valine

3、缬氨酸-Arginine精氨酸IntroductoryFacts:Pigsdonotrequireproteinpersebutrathertheaminoacidsthatmakeupprotein猪本身不需要蛋白质，而是需要组成蛋白质的氨基酸Aminoacidsinthedietareprovidedbyprotein-containingfeeds(corn,soybeanmeal,sorghum,fishmealetc)日粮中的氨基酸由含蛋白质的饲料组分(如玉米,豆粕,高粱,鱼粉等)提供Aminoaci

4、dprogression:DietaryproteinFreeaminoacids游离氨基酸Smallintestine小肠Blood血液ProteinsynthesisFeces粪Urine尿日粮蛋白质蛋白质合成TypicalGrowerDiet典型生长猪日粮Ingredient组分%Corn玉米78.55Soybeanmeal豆粕19.05Dicalciumphospate磷酸氢钙1.25Limestone石粉.74Tracemineralsalt微量元素盐.35Vitaminpremix维生素.10Tot

5、al总计100.00Thevalueofaproteinsourceisdependentonitscapacitytocontributedigestibleaminoacidstotheanimal.TheChemicalScoreisasimpleapproachtoassessingvalue蛋白质来源的价值取决于为动物提供可消化氨基酸的能力，化学评分是评定蛋白价值的简单方法AminoacidRequirement,%Providedbydiet,%Provided/Requirement,%Lysin

6、e.75.5067.17Threonine.48.4493.39Tryptophan.12.12102.45Isoleucine.46.47102.91Met+CYs.41.45109.93Histidine.22.34156.58Leucine.601.29215.22Valine.48.61127.97Arginine.25.66264.38Theperformanceofananimalcanbenogreaterthanthatmadepossiblebytheaminoacidinleastsuppl

7、y.Thisiscommonlycalledthefirstlimitingaminoacid最少量被提供的氨基酸制约了动物的生产性能，这种氨基酸通常称作第一限制性氨基酸AminoacidRequirement,%Providedbydiet,%Provided/Requirement,%Lysine.75.5067.17Threonine.48.4493.39Tryptophan.12.12102.45Isoleucine.46.47102.91Met+His.41.45109.93Histidine.22.

8、34156.58Leucine.601.29215.22Valine.48.61127.97Arginine.25.66264.38(First)(Second)ProteinSynthesisLimitingAminoAcidsinSomeCommonFeedstuffs一些饲料原料中的限制性氨基酸IngredientFirstSecondCorn玉米Lysine赖氨酸Tryptop