<?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>2007-1124</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias pecuarias]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. de cienc. pecuarias]]></abbrev-journal-title>
<issn>2007-1124</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-11242016000100105</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Requerimientos energéticos de ovinos de pelo en las regiones tropicales de Latinoamérica. Revisión]]></article-title>
<article-title xml:lang="en"><![CDATA[Energy requirements of hair sheep in the tropical regions of Latin America. Review]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chay-Canul]]></surname>
<given-names><![CDATA[Alfonso Juventino]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Magaña-Monforte]]></surname>
<given-names><![CDATA[Juan Gabriel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chizzotti]]></surname>
<given-names><![CDATA[Mario Luiz]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Piñeiro-Vázquez]]></surname>
<given-names><![CDATA[Angel Trinidad]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Canul-Solís]]></surname>
<given-names><![CDATA[Jorge Rodolfo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ayala-Burgos]]></surname>
<given-names><![CDATA[Armin Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ku-Vera]]></surname>
<given-names><![CDATA[Juan Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tedeschi]]></surname>
<given-names><![CDATA[Luis Orlindo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Juárez Autónoma de Tabasco División Académica de Ciencias Agropecuarias ]]></institution>
<addr-line><![CDATA[Villahermosa Tabasco]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Yucatán Facultad de Medicina Veterinaria y Zootecnia ]]></institution>
<addr-line><![CDATA[Mérida Yucatán]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidade Federal de Viçosa  ]]></institution>
<addr-line><![CDATA[ MG]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Tecnológico de Tizimín Departamento de Investigación y Posgrado ]]></institution>
<addr-line><![CDATA[Tizimín Yucatán]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Texas A&M University Department of Animal Science ]]></institution>
<addr-line><![CDATA[College Station ]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2016</year>
</pub-date>
<volume>7</volume>
<numero>1</numero>
<fpage>105</fpage>
<lpage>125</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11242016000100105&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11242016000100105&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11242016000100105&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Los ovinos de pelo juegan un papel importante en la producción animal en las regiones tropicales; sin embargo, sus requerimientos nutricionales no se han determinado en la misma medida que los de las razas de lana. Debido a las condiciones ambientales de las regiones tropicales (clima, calidad y disponibilidad de alimentos), es razonable la hipótesis de que los requerimientos de energía metabolizable (EM) y la eficiencia de utilización de la EM pueden ser diferentes entre los ovinos de razas de pelo y de lana. La información disponible en ovinos de pelo muestra una gran discrepancia en cuanto a las necesidades de energía. Con base en datos de la literatura disponible para hembras ovinas, el requerimiento de EM para mantenimiento (EMm) fue de 419±129 kJ/kg PC0.75 (media ± desviación estándar) y para machos fue 388±123 kJ/kg BW0.75. El requerimiento de energía neta para la ganancia de peso (EN g ) varió de 8.75 a 14.06 kJ/g (11.63±1.86 kJ/g). Las eficiencias de utilización de la EM para el mantenimiento (k m ) y la ganancia de peso (kg ) fueron de 0.66±0.023 y 0.42±0.044, respectivamente. Esta revisión también indicó que la información es escasa para ovejas adultas en diferentes etapas fisiológicas (mantenimiento, lactancia y gestación). Se requiere más trabajo de investigación con relación a la estimación de las necesidades de energía de los ovinos de pelo, con el fin de hacer ajustes a los modelos existentes de alimentación, con el objetivo de predecir la respuesta de los animales con la condición que prevalece en los trópicos (tipo de animal, medio ambiente y alimentos disponibles).]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Breeds of hair sheep play an important role in animal production in tropical regions; however, their nutrient requirements have not been determined to the same extent as those of wool breeds. Due to the environmental conditions of the tropical regions (climate, quality and availability of feedstuffs), it is reasonable to hypothesize that energy requirements and efficiency of utilization of metabolizable energy (ME) may be different between hair and wool breeds of sheep. Information available on hair sheep shows a large discrepancy regarding energy requirements. Based on available literature data for female sheep, ME requirement for maintenance (MEm) was 419±129 kJ/ kg BW0.75 (mean ± standard deviation) and for the male 388±123 kJ/kg BW0.75. The requirement of net energy for gain (NE g ) ranged from 8.75 to 14.06 kJ/g (11.63±1.86 kJ/g). The efficiency of ME utilization for maintenance (km ) and gain (kg ) were 0.66±0.02 and 0.42±0.04, respectively. This review indicated also that information is scarce for adult ewes at different physiological stages (maintenance, lactation, or pregnancy). More work is required regarding estimates of nutrient requirements of hair sheep in order to develop adjustments to existing nutrition models to predict animal&#8217;s response under the conditions prevailing in the tropics (animal type, environment and feedstuffs available).]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Ovinos de pelo]]></kwd>
<kwd lng="es"><![CDATA[Requerimientos de energía]]></kwd>
<kwd lng="es"><![CDATA[Trópicos]]></kwd>
<kwd lng="es"><![CDATA[Mantenimiento]]></kwd>
<kwd lng="es"><![CDATA[Ganancia]]></kwd>
<kwd lng="es"><![CDATA[Eficiencia]]></kwd>
<kwd lng="en"><![CDATA[Hair sheep]]></kwd>
<kwd lng="en"><![CDATA[Energy requirements]]></kwd>
<kwd lng="en"><![CDATA[Tropics]]></kwd>
<kwd lng="en"><![CDATA[Maintenance]]></kwd>
<kwd lng="en"><![CDATA[Gain]]></kwd>
<kwd lng="en"><![CDATA[Efficiency]]></kwd>
</kwd-group>
</article-meta>
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