<?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>1659-1321</journal-id>
<journal-title><![CDATA[Agronomía Mesoamericana]]></journal-title>
<abbrev-journal-title><![CDATA[Agron. Mesoam]]></abbrev-journal-title>
<issn>1659-1321</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1659-13212020000200353</article-id>
<article-id pub-id-type="doi">10.15517/am.v31i2.38389</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Evaluación técnica-económica de la frecuencia de suplementación de novillos en pastoreo en Córdoba, Colombia]]></article-title>
<article-title xml:lang="en"><![CDATA[Technical-economic assessment of supplementation frequency over grazing steer in Córdoba, Colombia]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mestra-Vargas]]></surname>
<given-names><![CDATA[Lorena Inés]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barragán-Hernández]]></surname>
<given-names><![CDATA[Wilson Andrés]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Medina-Herrera]]></surname>
<given-names><![CDATA[Diego Andrés]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Flórez-Díaz]]></surname>
<given-names><![CDATA[Hernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Corporación Colombiana de Investigación Agropecuaria (AGROSAVIA)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Corporación Colombiana de Investigación Agropecuaria (AGROSAVIA)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Corporación Colombiana de Investigación Agropecuaria (AGROSAVIA  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Corporación Colombiana de Investigación Agropecuaria (AGROSAVIA)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<volume>31</volume>
<numero>2</numero>
<fpage>353</fpage>
<lpage>366</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-13212020000200353&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-13212020000200353&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-13212020000200353&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Introducción. La producción de carne bovina se ve afectada por la estacionalidad forrajera y el costo de alimentación. La evaluación de diferentes frecuencias de alimentación en función de la pastura, podría sugerir una práctica apropiada para mejorar la rentabilidad. Objetivo. Evaluar técnica y económicamente la frecuencia de suplementación de novillos de ceba Brahman en pastoreo. Materiales y métodos. En el valle medio del Río Sinú, Colombia, se utilizaron 108 novillos distribuidos en un diseño de parcelas divididas en tres pasturas (Cynodon nlemfuensis, Megathyrsus maximus y Brachiaria hybrida, parcela principal) y tres esquemas de suplementación (subparcela): todos los días (STD), cada dos días (SDpM) y sin suplementación (SS). En el animal se evaluó la ganancia diaria de peso (GDP) y características morfométricas. En la canal: peso, rendimiento, longitud, perímetro de pierna, espesor de grasa e índice de compacidad. Los resultados biofísicos alimentaron la evaluación financiera de la tecnología implementada. Resultados. Hubo interacción entre la pastura y la frecuencia de suplementación (p&lt;0,05) sobre la GDP. La mayor GDP se observó en animales de los tratamientos STD y en la gramínea C. nlemfuensis (680 g día-1), mientras que con la pastura de B. hybrida cv Mulato II en SDpM se encontró la menor GDP (500 g día-1). Hubo efecto (p&lt;0,05) de la dieta en la longitud corporal (150 vs 152 cm para novillos no suplementados y suplementados, respectivamente). No hubo diferencias (p&lt;0,05) entre tratamientos, sobre las características de la canal. Conclusiones. La respuesta biológica en GDP no compensó el costo operativo diferencial en animales suplementados. Es necesario evaluar nuevas dietas con materias primas y niveles de inclusión que contribuyan al aumento de la producción animal, para generar una respuesta diferencial del beneficio técnico y económico de la tecnología.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Introduction. Beef production is affected by stationarity forage production and fed cost. Feed frequency evaluations according to pasture could suggest an appropriate practice for profitability improvement. Objective. To evaluate technically and economically the frequency of supplementation of Brahman fattening steers in grazing. Materials and methods. In the middle valley of the Sinú river, Colombia, 108 steers were used distributed in a split-plot design into three pastures (Cynodon nlemfuensis, Megathyrsus maximus, and Brachiaria hybrida, main plot) and three supplementation schemes (subplot): daily (STD), every two days (SDpM) and without supplementation (SS). The daily weight gain (GPD) and morphometric characteristics were evaluated in steers. In the carcass: weight, yield, length, leg perimeter, fat thickness, and compactness index. The biophysical data results fed the financial evaluation of the implemented technology. Results. An interaction of pasture and supplementation frequency over daily weight gain was detected (p&lt;0.05). The highest GPD was observed in animals of the STD treatment for the grass C. nlemfuensis (680 g day-1), while a B. hybrida cv Mulato II in SDpM recorded the lowest GPD with 500 g day-1. An effect (p&lt;0.05) of the diet on body length was observed (150 vs. 152 cm for not supplemented and supplemented steers, respectively). There were no differences (p&lt;0.05) between treatments over carcass characteristics. Conclusions. The biological response in GPD did not compensate for the differential operating cost in the supplemented animals. It is necessary to evaluate new diets with raw materials and inclusion levels that contribute to the increase in animal production, to generate a detectable change in the animal and economic response.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[composición de la canal]]></kwd>
<kwd lng="es"><![CDATA[biometría]]></kwd>
<kwd lng="es"><![CDATA[forrajes]]></kwd>
<kwd lng="es"><![CDATA[ganancia de peso]]></kwd>
<kwd lng="es"><![CDATA[semilla de algodón]]></kwd>
<kwd lng="es"><![CDATA[salvado de arroz]]></kwd>
<kwd lng="en"><![CDATA[carcass composition]]></kwd>
<kwd lng="en"><![CDATA[biometrics]]></kwd>
<kwd lng="en"><![CDATA[forages]]></kwd>
<kwd lng="en"><![CDATA[weight gain]]></kwd>
<kwd lng="en"><![CDATA[cottonseed]]></kwd>
<kwd lng="en"><![CDATA[rice bran]]></kwd>
</kwd-group>
</article-meta>
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