低蛋白质补充氨基酸饲粮对北京鸭生长性能、血清生化指标及粪氮含量的.pdf

低蛋白质补充氨基酸饲粮对北京鸭生长性能、血清生化指标及

粪氮含量的影响

李忠荣;陈婉如;叶鼎承;林滉;刘景

【摘要】Thisexperimentwasconductedtoinvestigatetheeffectsoflow-

proteinaminoacid-supplementeddietsongrowthperformance,serum

biochemicalindicesandfecalnitrogencontentofBeijingducks.Four

hundredandfiftyone-day-oldBeijingduckswererandomlyallocatedto3

groupswith5replicatespergroupand30ducksperreplicate.Dietswere

preparedwith2-phasefeedingprogram.Threedietswereformulatedfor

eachphase.Thecontrolgroupwasfeddietswithcrudeproteinlevelof20%

during1to14daysofageand18%during15to42daysofage.The

experimentalgroupsIandIIwerefeddietswiththecrudeproteinlevelsof

1and2percentageslessthanthecontroldiet,respectively,but

supplementedaminoacids.Theresultsshowedasfollows:1)therewere

nosignificantdifferencesinaveragedailyfeedintake,averagedailygain

andfeed/gainamong3groupsduring1to14,15to42and1to42days

ofage(P0.05).2)At14and42daysofage,nosignificantdifferencesin

serumtotalprotein,uricacidandureanitrogencontents,andalanine

amin-otransferaseandglutamic-oxaloacetictransaminaseactivitieswere

foundamong3groups(P0.05).3)Comparedwiththecontrolgroup,

thefecalnitrogencontentinexperimentalgroupsIandIIwasreducedby

4.60%and15.71%at1to14daysofageandby10.77%and15.82%at

15to42daysofage(P0.05),respectively.Itisconcludedthatreducing

dietarycrudeproteinlevelby1to2percentageshasnosignificanteffects

ongrowthperformanceandserumbiochemicalindices,whilesignificantly

decreasesfecalnitrogencontentofBeijingducksunderthepremiseof

meetingtheaminoacidrequirements.%本试验旨在研究低蛋白质补充氨基酸

饲粮对北京鸭生长性能、血清生化指标及粪氮含量的影响.选取1日龄北京鸭450

只,随机分为3组,每组5个重复,每个重复30只.饲粮分2个阶段配制,每个阶段配

制3种饲粮.对照组1～14日龄和15～42日龄分别饲喂粗蛋白质水平为20％和

18％的饲粮；试验Ⅰ组、试验Ⅱ组饲喂在对照组饲粮基础上分别降低1、2个