资源描述：
《validation of the essential amino acid …：的必需氨基酸的验证…》由会员上传分享，免费在线阅读，更多相关内容在应用文档-天天文库。
1、ValidationoftheEssentialAminoAcidRequirementsofNileTilapia,Oreochromisniloticus(Linne1758),AssessedbytheIdealProteinConceptO.A.FagbenroDepartmentofFisheriesandWildlife,FederalUniversityofTechnology,P.M.B.704Akure,NigeriaAlfabol@cyberspace.net.ngABSTRACTEssentialam
2、inoacidpatternofwholebodyofOreochromisniloticus(Linne1758),themostimportantfishinAfricanaquaculture,wasdeterminedinacidhydrolysatesandusingtheidealproteinconcept(essentialaminoacidratio).Theessentialaminoacidrequirements(g/kgprotein)wereestimatedas:arginine,41;his
3、tidine,15;isoleucine,26;leucine,43;methionine+cystine,34;phenylalanine+tyrosine,48;threonine,33;tryptophan,6;valine,30.Exceptforhigherleucineandlowerphenylalanine+tyrosinerequirements,estimatedrequirementsfortheotheressentialaminoacidsweresimilartotheempiricallyde
4、terminedessentialaminoacidsrequirementsofO.niloticusrecordedinliterature.Thisinformationisusefulindevelopingnutrient-balanced,cost-effectiveresearchdietsandpracticalfeedsforothercultivatedtilapias.INTRODUCTIONTheNiletilapia,Oreochromisniloticus(Linne1758),isthemos
5、timportanttilapiausedinAfricanaquaculture,underbothfreshwaterandbrackishwaterculture(FAO1997),becauseoftheirhardiness,fastgrowthandattainmentoflargesizeasadults.TheleveloffishfeedtechnologyavailabletofishfarmersinmanyAfricancountriesislowandfishfeedformulationprog
6、ramsarebasedonavailableinformationonthenutrientrequirementdatagivenbyNRC(1993).EssentialaminoacidrequirementsofseveralcultivatedtilapiashavenotbeenestablishedbutthatofO.niloticusisavailable(Santiago&Lovell1988).Essentialaminoacidrequirementvaluesempiricallydetermi
7、nedfortheNiletilapiashouldsuffice,butNRC(1993)cautionedthatessentialaminoacidrequirementsarenotinterchangeableamongspecies.Theconceptof"anidealprotein"usedasamethodofdeterminingtheessentialaminoacidrequirementsoffishwassuggestedbyWilson(1991).Thisisbasedonthedirec
8、tcorrelationbetweenessentialaminoacidpatterninfishtissuesanddietaryessentialaminoacidrequirementpattern.Iftherequirementforasingleessentialaminoacid,for
