Urea, qhov sib xyaw uas muaj nyob hauv cov ntshav, zis thiab mis nyuj, yog lub ntsiab ntawm nitrogen excretion hauv cov tsiaj.Kev kuaj xyuas qib ntawm urea hauv nyuj nyuj pab cov kws tshawb fawb thiab cov neeg ua liaj ua teb nkag siab tias nitrogen hauv cov khoom noj tau siv zoo li cas hauv cov nyuj noj.Nws yog ib qho tseem ceeb rau cov neeg ua liaj ua teb nyob rau hauv cov nqe lus ntawm tus nqi pub khoom noj, cov txiaj ntsig ntawm lub cev ntawm cov nyuj (xws li kev ua me nyuam), thiab kev cuam tshuam ntawm kev tso tawm ntawm ib puag ncig.Kev lag luam tseem ceeb ntawm nitrogen hauv nyuj manure.Yog li ntawd, qhov tseeb ntawm kev kuaj pom cov qib urea hauv cov nyuj yog qhov tseem ceeb.Txij li thaum xyoo 1990s, qhov nruab nrab-infrared kuaj pom mis nyuj urea nitrogen (MUN) yog qhov ua tau zoo tshaj plaws thiab tsis muaj kev cuam tshuam tsawg tshaj plaws uas siv los ntsuas cov nitrogen hauv cov nyuj ntau.Nyob rau hauv ib tsab xov xwm tsis ntev los no luam tawm nyob rau hauv Phau ntawv Journal of Dairy Science, cov kws tshawb fawb ntawm Cornell University tau tshaj tawm txog kev txhim kho cov txheej txheem muaj zog ntawm MUN calibration reference tests tshiab los txhim kho qhov tseeb ntawm MUN ntsuas.
"Thaum ib txheej ntawm cov qauv no tau khiav ntawm lub tshuab ntsuas mis, cov ntaub ntawv tuaj yeem siv los txheeb xyuas cov teeb meem tshwj xeeb hauv MUN kev twv ua ntej zoo, thiab tus neeg siv khoom siv lossis cov chaw tsim khoom ntawm lub tshuab ntsuas mis yuav kho cov teeb meem no," piav qhia cov laus. sau David.Dr. M. Barbano, Northeast Dairy Research Center, Department of Food Science, Cornell University, Ithaca, New York, USA.Qhov tseeb thiab raws sijhawm MUN cov ntaub ntawv qhia txog "yog qhov tseem ceeb heev rau kev pub mis nyuj noj thiab tswj kev yug me nyuam," Barbano ntxiv.
Muab qhov kev tshuaj xyuas thoob ntiaj teb nce ntxiv ntawm kev cuam tshuam ib puag ncig ntawm kev ua liaj ua teb loj thiab cov teeb meem kev lag luam los ntawm cov neeg ua liaj ua teb, qhov xav tau kom nkag siab meej txog kev siv nitrogen hauv kev lag luam mis nyuj yuav tsis tau ceev heev.Qhov kev txhim kho hauv kev ntsuas cov mis nyuj no ua rau muaj kev vam meej ntxiv rau kev noj qab haus huv thiab kev noj qab haus huv ntau dua kev ua liaj ua teb thiab khoom noj khoom haus, uas yuav muaj txiaj ntsig zoo rau cov neeg tsim khoom thiab cov neeg siv khoom.Saib Portnoy M et al.Infrared mis nyuj analyzer: mis nyuj urea nitrogen calibration.J. Dairy Science.Plaub Hlis 1, 2021, hauv xovxwm.doi: 10.3168/jds.2020-18772 Zaj lus no yog luam tawm los ntawm cov ntaub ntawv hauv qab no.Lus Cim: Cov khoom yuav raug kho kom ntev thiab cov ntsiab lus.Yog xav paub ntxiv, thov hu rau lub vev xaib raug cai.
Lub sij hawm xa tuaj: Plaub Hlis-05-2021