<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0122-0268</journal-id>
<journal-title><![CDATA[Revista MVZ Córdoba]]></journal-title>
<abbrev-journal-title><![CDATA[Rev.MVZ Cordoba]]></abbrev-journal-title>
<issn>0122-0268</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Córdoba - Facultad de Medicina Veterinaria y Zootecnia.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0122-02682019000307346</article-id>
<article-id pub-id-type="doi">10.21897/rmvz.1461</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estimación del balance de metionina y lisina metabolizable en vacas de leche en pastoreo]]></article-title>
<article-title xml:lang="en"><![CDATA[Estimation of the balance of metabolizable lysine and methionine for grazing dairy cows]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Duque-Quintero]]></surname>
<given-names><![CDATA[Mónica]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rosero-Noguera]]></surname>
<given-names><![CDATA[Ricardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Olivera-Angel]]></surname>
<given-names><![CDATA[Martha]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,University of Antioquia  ]]></institution>
<addr-line><![CDATA[Medellin ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Antioquia  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<volume>24</volume>
<numero>3</numero>
<fpage>7346</fpage>
<lpage>7354</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0122-02682019000307346&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0122-02682019000307346&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0122-02682019000307346&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Objetivos. El objetivo de este trabajo fue estimar en vacas en pastoreo, tanto la reproducibilidad como la precisión del balance de metionina (Met) y lisina (Lis), aminoácidos más limitantes en la producción de leche, cuando se comparan los valores predichos versus los valores observados.  Materiales y métodos.  Se usaron 12 vacas durante un periodo de 20 días. Control: animales pastoreando y suplementados con alimento balanceado; Met-Lis: igual al control y el suplemento se ajustó con Lis y Met protegida. Para los valores predichos para la suplementación de Met y Lis, se tuvo en cuenta el promedio del consumo de materia seca (CMS) del hato, basado en la oferta y el consumo de pasto y los valores de proteína microbiana. Los valores observados se determinaron con base en el CMS individual usando marcadores externos e internos, además, la producción individual de proteína microbiana. Se realizó una prueba de t pareada y un modelo de predicción para determinar la eficiencia fue determinado usando el error cuadrático medio de predicción (ECMP) y el coeficiente de concordancia (CCC).  Resultados. Se encontraron diferencias significativas entre la suplementación y el balance de Met y Lis, entre los valores predichos y los valores observados para el CMS del forraje, la digestibilidad de la proteína microbiana, la producción de proteína microbiana, el suministro y el balance de Lis y Met. El CCC del balance de Lis y Met fue bajo (0.10), el ECMP fue alto, excepto para el CMS, que tuvo una concordancia moderada (0.63) y un bajo ECMP(4.42).  Conclusiones. Estos resultados demuestran la falta de precisión de las herramientas que se usan para balancear las raciones individuales de vacas en pastoreo, ya que subestiman la suplementación y el balance de los aminoácidos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Objective. The aim of this study was to determine in grazing cows, the reproducibility and accuracy of the balance between predicted values, when compared with the observed values for the most limiting amino acids in milk protein synthesis, the methionine (Met) and Lysine (Lys).  Materials and methods.  Twelve lactating cows were used for a 20-day experimental period. Control: animals grazing and supplemented with balanced food; Met-Lys: same as control and supplemented with adjusted rumen protected Met and Lys. For Met and Lys supply predicted values, it was taking in account the average of the dry matter intake (DMI) of the herd, based in offer and foraging control and values of microbial protein data. Observed values were determined based in the individual DMI intake, using external and internal markers and the individual microbial protein production. A t-paired-sample test was performed and the efficiency of the model&#8217;s prediction was determined using the mean square prediction error (MSPE) and the concordance coefficient (CCC).  Results.  Significant differences were found between the predicted and observed values for DMI forage, digestible microbial protein and microbial protein production, supply and the balance of Lys and Met. The CCC for Lys and Met balance were low (0.10), the MSPE was high except for the total DMI with a moderate concordance (0.63) and low MSPE (4.42).  Conclusions.  These results indicate a lack of precision of the tools, which underestimates the supply and balance of amino acids in individual grazing cows.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Estimación]]></kwd>
<kwd lng="es"><![CDATA[aminoácidos esenciales]]></kwd>
<kwd lng="es"><![CDATA[pastoreo]]></kwd>
<kwd lng="es"><![CDATA[proteína microbiana]]></kwd>
<kwd lng="es"><![CDATA[validación. (Fuente: CAB Thesaurus]]></kwd>
<kwd lng="es"><![CDATA[Tesauro SPINES)]]></kwd>
<kwd lng="en"><![CDATA[Estimation]]></kwd>
<kwd lng="en"><![CDATA[essential amino acids]]></kwd>
<kwd lng="en"><![CDATA[grazing]]></kwd>
<kwd lng="en"><![CDATA[microbial protein]]></kwd>
<kwd lng="en"><![CDATA[validation (Fuentes: CAB Thesaurus]]></kwd>
<kwd lng="en"><![CDATA[Tesauro SPINES)]]></kwd>
</kwd-group>
</article-meta>
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