<?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>1405-3195</journal-id>
<journal-title><![CDATA[Agrociencia]]></journal-title>
<abbrev-journal-title><![CDATA[Agrociencia]]></abbrev-journal-title>
<issn>1405-3195</issn>
<publisher>
<publisher-name><![CDATA[Colegio de Postgraduados]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-31952016000300297</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Emisión de metano en los sistemas de producción de leche bovina en el Valle de San Luis Potosí, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Methane emission from dairy cattle production systems in San Luis Potosi Valley, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Beltrán-Santoyo]]></surname>
<given-names><![CDATA[Miguel Á.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Álvarez-Fuentes]]></surname>
<given-names><![CDATA[Gregorio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pinos-Rodríguez]]></surname>
<given-names><![CDATA[Juan M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Contreras-Servín]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de San Luis Potosí Instituto de Investigación de Zonas Desérticas ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de San Luis Potosí Centro Regional de Biociencias ]]></institution>
<addr-line><![CDATA[ San Luis Potosí]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>05</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>05</month>
<year>2016</year>
</pub-date>
<volume>50</volume>
<numero>3</numero>
<fpage>297</fpage>
<lpage>305</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952016000300297&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952016000300297&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952016000300297&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Los sistemas de producción de leche bovina originan impactos globales debido a las emisiones de gases de efecto invernadero (GEI) como el CO2, CH4 y N2O, provenientes de la respiración, fermentación entérica y manejo de las heces. El objetivo de este estudio fue caracterizar los sistemas de producción de leche bovina en el valle de San Luis Potosí, México, e identificar diferencias en la producción de leche entre ellos, eficiencia de conversión del alimento y las emisiones de metano. Quince de 35 unidades de producción de leche bovina, con hatos de 20 a 100 vacas Holstein en producción, fueron evaluadas. Las emisiones de CH4 se determinaron con base en las directrices del panel intergubernamental de cambio climático (IPCC). El factor de emisión de CH4 por fermentación entérica de vacas en producción fue 51.2711.71 kg año-1 por vaca, mientras que por el manejo de heces fue 0.220.05 kg año-1 por vaca. Un análisis de correlación de Pearson de intensidad de metano y eficiencia alimenticia (r=-0.92) mostró que la eficiencia de conversión del alimento aumenta y la intensidad de emisión de metano disminuye.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Dairy cattle production systems cause global impacts because they emit greenhouse gases (GHG), such as CO2, CH4 and N2O, from respiration, enteric fermentation and manure management. The objective of this study was to characterize dairy cattle production systems in the San Luis Potosí Valley, Mexico, and identify the differences among them in terms of milk production, feed conversion efficiency and methane emissions. Fifteen of the 35 dairy cattle production units, with herds of 20 to 100 producing Holstein cows, were evaluated. Emissions of CH4 were determined on the basis of the guidelines published by the Intergovernmental Panel on climate change (IPCC). The CH4 emission factor due to enteric fermentation from cows in lactation was 51.27±11.71 kg year -1 per cow, whereas that from manure management was 0.22±0.05 kg year -1 per cow. A Pearson correlation analysis of methane intensity and feed conversion efficiency (r=-0.92) indicated that feed conversion efficiency increases methane and emission intensity decreases.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Emisión de metano]]></kwd>
<kwd lng="es"><![CDATA[eficiencia alimenticia]]></kwd>
<kwd lng="es"><![CDATA[producción de leche]]></kwd>
<kwd lng="en"><![CDATA[Methane emissions]]></kwd>
<kwd lng="en"><![CDATA[feed efficiency]]></kwd>
<kwd lng="en"><![CDATA[milk production]]></kwd>
</kwd-group>
</article-meta>
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