<?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>2730-5066</journal-id>
<journal-title><![CDATA[Agrociencia Uruguay]]></journal-title>
<abbrev-journal-title><![CDATA[Agrocienc. Urug.]]></abbrev-journal-title>
<issn>2730-5066</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Agronomía - Instituto de Nacional de Investigación Agropecuaria]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2730-50662021000101401</article-id>
<article-id pub-id-type="doi">10.31285/agro.25.107</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Estimated beef cattle performance under intensive grazing systems in Uruguay]]></article-title>
<article-title xml:lang="es"><![CDATA[Estimación del desempeño de bovinos para carne en sistemas pastoriles intensivos de Uruguay]]></article-title>
<article-title xml:lang="pt"><![CDATA[Estimativa do desempenho de bovinos de corte em sistemas pastoris intensivos do Uruguai]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Clariget]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lema]]></surname>
<given-names><![CDATA[O. M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[La Manna]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Perez]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Banchero]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Investigación Agropecuaria (INIA)  ]]></institution>
<addr-line><![CDATA[Colonia ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Investigación Agropecuaria (INIA)  ]]></institution>
<addr-line><![CDATA[Treinta y Tres ]]></addr-line>
<country>Uruguay</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<volume>25</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_arttext&amp;pid=S2730-50662021000101401&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_abstract&amp;pid=S2730-50662021000101401&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_pdf&amp;pid=S2730-50662021000101401&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The objective of this study was to analyze the effect of the quantity and quality of the feed offered on the performance of male beef cattle, &gt;6 months old, on intensive grazing systems in Uruguay. Two hundred and fifty-four results from different experimental trials (nexp=68) performed between 1991 and 2020 by different research institutions in Uruguay were compiled and analyzed. The experiments included feeding studies with cultivated pastures as a single nutritional source (nexp=61), as well as supplementation studies on the same type of pastures (nexp=49). Simple, quadratic, multiple linear regressions and recursive partitions were performed to synthesize the information. Quadratic relationships between forage allowance (fa) and average daily gain (adg) were observed for the different animal categories and seasons of the year. Including other parameters such as initial body weight and supplementation with energy concentrates or silages allowed to predict the adg of animals under a wide range of feeding alternatives. Briefly, low fa levels (&#8804;1.75 %bw) limit animal performance to maintenance gain conditions (0.2 kg/day). To achieve adequate levels of adg (0.6-0.7 kg/day), with a low to moderate fa (between 1.75 to 3.5 %bw), the nutritional value of pasture needs to reach at least level 3 of quality (&gt;58 %odm, &gt;13 %cp, &lt;50 %ndf, &gt;21 %Leg and &lt;19 %dr). These daily gains can be exceeded if the fa is &gt;3.5 %bw (adg in the range of 0.7 to 1.0 kg/day). The increased response in additional adg (0.4-0.5 kg/day) by the effect of supplementation with energy concentrate was achieved with low fa levels (&#8804;2.25 %bw). The prediction of additional adg using a multiple linear regression parameter allows evaluating whether supplementation is appropriate.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: El objetivo del presente trabajo fue analizar el efecto de la cantidad y la calidad de alimento ofrecido sobre el desempeño de bovinos para carne machos, de más de 6 meses de vida, en sistemas pastoriles intensivos de Uruguay. Se compilaron y analizaron 254 resultados de diferentes trabajos experimentales (nexp=68) realizados por distintas instituciones de investigación de Uruguay entre los años 1991 y 2020. Los estudios incluyen trabajos de alimentación con pasturas cultivadas como única fuente nutricional (nexp=61), así como trabajos de suplementación sobre ese mismo tipo de pasturas (nexp=49). Se realizaron regresiones lineales simples, cuadráticas, lineales múltiples y particiones recursivas de modo de sintetizar la información. Se observaron relaciones cuadráticas entre la asignación de forraje (af) y la ganancia media diaria (gmd) para las diferentes categorías y estaciones del año. La inclusión de otros parámetros como peso vivo inicial y suplementación con concentrados energéticos o ensilajes permitió predecir la gmd de los animales bajo un amplio rango de alternativas de alimentación. Brevemente, niveles bajos de af (&#8804;1,75 %pv) limitan el desempeño animal a condiciones de mantenimiento (0,2 kg/día). Para lograr niveles de gmd adecuados (0,6-0,7 kg/día), con af bajas a moderadas (entre 1,75 a 3,5 %pv), se necesita que el valor nutritivo de la pastura alcance al menos el nivel 3 de calidad (&gt;58 %dmo, &gt;13 %pc, &lt;50 %fdn, &gt;21 %Leg y &lt;19 %rs). Esas ganancias pueden superarse si la af es &gt;3,5 %pv (gmd en el rango de 0,7 a 1,0 kg/día). La mayor respuesta en gmd adicional (0,4-0,5 kg/día) por efecto de la suplementación con concentrados energéticos se logra con niveles de af bajos (&#8804;2,25 %pv). La predicción de gmd adicional utilizando los parámetros de la regresión lineal múltiple permite evaluar la conveniencia de la suplementación.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo: O objetivo do presente trabalho foi analisar o efeito da quantidade e qualidade do alimento oferecido sobre o crescimento de bovinos de corte, machos e de mais de 6 meses de idade em sistemas pastoris intensivos do Uruguai. Foram analisados 254 resultados de vários trabalhos experimentais (nexp=68) desenvolvidos por diferentes instituições de pesquisa de Uruguai no período compreendido entre os anos 1991 e 2020. Os estudos incluem trabalhos de alimentação com pastagens cultivadas como única fonte nutricional (nexp=61) e trabalhos de suplementação sobre o mesmo tipo de pastagens (nexp=49). Para compendiar a informação foram implementadas regressões lineais simples, quadráticas, lineais múltiplas e partições recursivas. Foi observada uma relação quadrática entre a forragem oferecida (FO) e o ganho médio diário (GMD) para diferentes categorias e estacoes do ano. A inclusão de outros parâmetros como peso vivo inicial e suplementação com concentrados energéticos ou silagem permitem predizer a GMD dos animais num amplo intervalo de opções de alimentação. Baixos níveis de FO (&#8804;1,75 %PV) limitam o desempenho animal em situação de mantença (0,2 kg/dia). Para lograr níveis de GMD adequados (0,6-0,7 kg/dia), com FO baixas a moderadas (1,75 a 3,5 %PV), e necessário que o valor nutricional da pastagem alcance pelo menos o nível 3 de qualidade (&gt;58 %DMO, &gt;13 %PB, &lt;50 %FDN, &gt;21 % Leg e &lt;19 %RS). Esses GMD podem ser superados se FO e &gt;3,5 %PV (GMD no intervalo de 0,7 a 1,0 kg/dia). A maior resposta no GMD adicional (0,4-0,5 kg/dia) por efeito da suplementação com concentrados energéticos é obtida com níveis de FO baixos (&#8804;2,25 %PV). A previsão de GMD adicional usando os parâmetros de regressão linear múltipla permite avaliar a adequação da suplementação.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[review]]></kwd>
<kwd lng="en"><![CDATA[rearing]]></kwd>
<kwd lng="en"><![CDATA[fattening]]></kwd>
<kwd lng="en"><![CDATA[supplementation]]></kwd>
<kwd lng="en"><![CDATA[cultivated pasture]]></kwd>
<kwd lng="es"><![CDATA[revisión]]></kwd>
<kwd lng="es"><![CDATA[recría]]></kwd>
<kwd lng="es"><![CDATA[engorde]]></kwd>
<kwd lng="es"><![CDATA[suplementación]]></kwd>
<kwd lng="es"><![CDATA[pasturas cultivadas]]></kwd>
<kwd lng="pt"><![CDATA[revisão]]></kwd>
<kwd lng="pt"><![CDATA[crescimento]]></kwd>
<kwd lng="pt"><![CDATA[terminação]]></kwd>
<kwd lng="pt"><![CDATA[suplementação]]></kwd>
<kwd lng="pt"><![CDATA[pastagens cultivadas]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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