<?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>2007-0934</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias agrícolas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Mex. Cienc. Agríc]]></abbrev-journal-title>
<issn>2007-0934</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-09342017000400965</article-id>
<article-id pub-id-type="doi">10.29312/remexca.v8i4.20</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estado de la investigación sobre emisiones de metano entérico y estrategias de mitigación en América Latina]]></article-title>
<article-title xml:lang="en"><![CDATA[Status of research on enteric methane emissions and mitigation strategies in Latin America]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Benaouda]]></surname>
<given-names><![CDATA[Mohammed]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González Ronquillo]]></surname>
<given-names><![CDATA[Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Molina]]></surname>
<given-names><![CDATA[Luisa T.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castelán Ortega]]></surname>
<given-names><![CDATA[Octavio Alonso]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma del Estado de México Facultad de Veterinaria y Zootecnia ]]></institution>
<addr-line><![CDATA[Toluca ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Molina Center for Energy and the Environment  ]]></institution>
<addr-line><![CDATA[ CA]]></addr-line>
<country>United States of America</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>07</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>07</month>
<year>2017</year>
</pub-date>
<volume>8</volume>
<numero>4</numero>
<fpage>965</fpage>
<lpage>974</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-09342017000400965&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-09342017000400965&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-09342017000400965&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La medición de la emisión de gases de efecto invernadero es altamente relevante en la evaluación del impacto ambiental de los sistemas agropecuarios. El metano producido por la fermentación entérica de los rumiantes representa una parte importante de todas las emisiones antropogénicas de gases de efecto invernadero en América Latina, donde hay una gran producción de rumiantes. Actualmente, los esfuerzos de los países latinoamericanos están enfocados más en la cuantificación de las emisiones de metano y el cálculo de los inventarios nacionales que en la mitigación. En este ensayo se exponen los datos obtenido hasta ahora en diferentes experimentos, en término de determinación in vivo de las emisiones de metano en los países de América latina. Esto, con la intención de discutir y dar a conocer el panorama actual y los avances de la zona en cuanto a la medición del impacto ambiental de este gas y el desarrollo de estrategias para reducir su producción por los rumiantes. Finalmente se marcan los retos que se enfrenta en el futuro la investigación sobre el tema.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Measurement of greenhouse gas emissions is highly relevant in assessing the environmental impact of agricultural systems. Methane produced by enteric fermentation of ruminants represents an important part of all anthropogenic emissions of greenhouse gases in Latin America, where there is a large production of ruminants. Currently, the efforts of Latin American countries are focused more on the quantification of methane emissions and the calculation of national inventories than on mitigation. In this paper the data obtained so far in different experiments, in terms of in vivo determination of methane emissions in the countries of Latin America are exposed. This, with the intention of discussing and making known the current panorama and the zone progress in terms of measurement of the environmental impact of this gas and the development of strategies to reduce its production by ruminants. Finally the challenges that are faced in the future in the investigation on the subject are marked.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[América Latina]]></kwd>
<kwd lng="es"><![CDATA[gases de efecto invernadero]]></kwd>
<kwd lng="es"><![CDATA[metano entérico]]></kwd>
<kwd lng="es"><![CDATA[rumiantes]]></kwd>
<kwd lng="en"><![CDATA[enteric methane]]></kwd>
<kwd lng="en"><![CDATA[greenhouse gases]]></kwd>
<kwd lng="en"><![CDATA[Latin America]]></kwd>
<kwd lng="en"><![CDATA[ruminants]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ayala]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Albores]]></surname>
<given-names><![CDATA[M. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Alayón]]></surname>
<given-names><![CDATA[G. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Aguilar]]></surname>
<given-names><![CDATA[P. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Solorio]]></surname>
<given-names><![CDATA[S. F.]]></given-names>
</name>
<name>
<surname><![CDATA[Ramírez]]></surname>
<given-names><![CDATA[L.V.]]></given-names>
</name>
<name>
<surname><![CDATA[Magaña]]></surname>
<given-names><![CDATA[M.J]]></given-names>
</name>
<name>
<surname><![CDATA[Ku]]></surname>
<given-names><![CDATA[V. J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Efecto del fruto molido de Enterolobium cyclocarpum Jacq Griseb. sobre la población de protozoarios y la producción de metano en el rumen de ovinos de pelo]]></article-title>
<source><![CDATA[proceeding of primera conferencia de gases de efecto invernadero en sistemas agropecuarios de Latinoamérica]]></source>
<year>2014</year>
<page-range>105-4</page-range></nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bárbaro]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Gere]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Gratton]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Rubio]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Williams]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[First measurements of methane emitted by grazing cattle of the Argentinean beef system]]></article-title>
<source><![CDATA[New Zealand J. Agric. Res.]]></source>
<year>2008</year>
<volume>51</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>209-19</page-range><publisher-name><![CDATA[New Zealand]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Blaxter]]></surname>
<given-names><![CDATA[K. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Clapperton]]></surname>
<given-names><![CDATA[J. L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Prediction of the amount of methane produced by ruminants.]]></article-title>
<source><![CDATA[British J. Nutr.]]></source>
<year>1965</year>
<volume>19</volume>
<page-range>511-22</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bualo]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Gere]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Pierini]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Arias]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Ortega]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Wulff]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Berra]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<source><![CDATA[Determinación y comparación de factores de emisión de metano entérico para vacas de cría en condiciones de pastoreo con dos dietas diferentes]]></source>
<year>2014</year>
<conf-name><![CDATA[ proceeding of primera conferencia de gases de efecto invernadero en sistemas agropecuarios de Latinoamérica, 54]]></conf-name>
<conf-loc> </conf-loc>
<page-range>103-4</page-range></nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Canesin]]></surname>
<given-names><![CDATA[C. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Berchielli]]></surname>
<given-names><![CDATA[T. T.]]></given-names>
</name>
<name>
<surname><![CDATA[Messana]]></surname>
<given-names><![CDATA[J. D.]]></given-names>
</name>
<name>
<surname><![CDATA[Baldi]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Pires]]></surname>
<given-names><![CDATA[A. P.]]></given-names>
</name>
<name>
<surname><![CDATA[Frighetto]]></surname>
<given-names><![CDATA[R. T. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Fiorentini]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Reis]]></surname>
<given-names><![CDATA[R. A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effects of supplementation frequency on the ruminal fermentation and enteric methane production of beef cattle grazing in tropical pastures]]></article-title>
<source><![CDATA[Rev. Bras. Zoot.]]></source>
<year>2014</year>
<volume>43</volume>
<numero>11</numero>
<issue>11</issue>
<page-range>590-600</page-range><publisher-loc><![CDATA[Brazil ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cerri]]></surname>
<given-names><![CDATA[C. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Maia]]></surname>
<given-names><![CDATA[S. M. F.]]></given-names>
</name>
<name>
<surname><![CDATA[Galdos]]></surname>
<given-names><![CDATA[M. V.]]></given-names>
</name>
<name>
<surname><![CDATA[Cerri]]></surname>
<given-names><![CDATA[C. E. P.]]></given-names>
</name>
<name>
<surname><![CDATA[Feigl]]></surname>
<given-names><![CDATA[B. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Bernoux]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Brazilian greenhouse gas emissions: the importance of agriculture and livestock]]></article-title>
<source><![CDATA[Sci. Agric.]]></source>
<year>2009</year>
<volume>66</volume>
<numero>6</numero>
<issue>6</issue>
<page-range>831-43</page-range><publisher-loc><![CDATA[Brazil ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Crutzen]]></surname>
<given-names><![CDATA[P. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Sanhueza]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Brenninkmeijer]]></surname>
<given-names><![CDATA[C. A. M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Methane production from mixed tropical savanna and forest vegetation in Venezuela]]></article-title>
<source><![CDATA[Atmospheric Chemistry and Physics Discussions]]></source>
<year>2006</year>
<volume>6</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>3093-7</page-range></nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Demarchi]]></surname>
<given-names><![CDATA[J. J. A. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Manella]]></surname>
<given-names><![CDATA[M. Q.]]></given-names>
</name>
<name>
<surname><![CDATA[Lourenço]]></surname>
<given-names><![CDATA[A. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Alleoni]]></surname>
<given-names><![CDATA[G. F.]]></given-names>
</name>
<name>
<surname><![CDATA[Frighetto]]></surname>
<given-names><![CDATA[R. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Primavesi]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<name>
<surname><![CDATA[Lima]]></surname>
<given-names><![CDATA[M. A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Daily methane emission at different seasons of the year by Nellore cattle in Brazil grazing Brachiaria brizantha cv. Marandu preliminary results]]></source>
<year>2003</year>
<conf-name><![CDATA[ world conference on animal production, 9]]></conf-name>
<conf-loc>Porto Alegre, Brazil </conf-loc>
</nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Dini]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Gere]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Briano]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Manetti]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Juliarena]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Picasso]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Grantton]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Astigarraga]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Methane emission and milk production of dairy cows grazing pastures rich in legumes or rich in grasses in Uruguay]]></article-title>
<source><![CDATA[Animals]]></source>
<year>2012</year>
<volume>2</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>288-300</page-range></nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Eckard]]></surname>
<given-names><![CDATA[R. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Grainger]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[de Klein]]></surname>
<given-names><![CDATA[C. A. M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Options for the abatement of methane and nitrous oxide from ruminant production: a review]]></article-title>
<source><![CDATA[Livestock Science]]></source>
<year>2010</year>
<volume>130</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>3):47-56</page-range></nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gonçalves de Faria]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Gonçalves]]></surname>
<given-names><![CDATA[L. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Gonzara]]></surname>
<given-names><![CDATA[J.D.]]></given-names>
</name>
<name>
<surname><![CDATA[Nogueira]]></surname>
<given-names><![CDATA[C. J. C.]]></given-names>
</name>
</person-group>
<source><![CDATA[Emisiones de metano en ovinos alimentados con ensilados de Bermuda Tifton 85 en diferentes edades de corte]]></source>
<year>2014</year>
<conf-name><![CDATA[ primera conferencia de gases de efecto invernadero en sistemas agropecuarios de Latinoamérica, 54]]></conf-name>
<conf-loc>Chile </conf-loc>
<page-range>91-2</page-range></nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Herrera]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Hube]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Morales]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Ungerfeld]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Muñoz]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
</person-group>
<source><![CDATA[Efecto de la suplementación con concentrado sobre las emisiones de metano y desempeño productivo de vacas lecheras en lactancia tardía]]></source>
<year>2014</year>
<conf-name><![CDATA[ primera conferencia de gases de efecto invernadero en sistemas agropecuarios de Latinoamérica]]></conf-name>
<conf-loc>54 </conf-loc>
<page-range>89-90</page-range></nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hristov]]></surname>
<given-names><![CDATA[A. N.]]></given-names>
</name>
<name>
<surname><![CDATA[Oh]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Firkins]]></surname>
<given-names><![CDATA[J. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Dijkstra]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Kebreab]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Waghorn]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Makkar]]></surname>
<given-names><![CDATA[H. P.]]></given-names>
</name>
<name>
<surname><![CDATA[Adesogan]]></surname>
<given-names><![CDATA[A. T.]]></given-names>
</name>
<name>
<surname><![CDATA[Yang]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Lee]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Gerber]]></surname>
<given-names><![CDATA[P. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Henderson]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Tricarico]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Special topics- mitigation of methane and nitrous oxide emissions from animal operations: I. A review of enteric methane mitigation options]]></article-title>
<source><![CDATA[J. Animal Sci.]]></source>
<year>2013</year>
<volume>91</volume>
<numero>11</numero>
<issue>11</issue>
<page-range>5045-69</page-range></nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Huarte]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Cifuentes]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Gratton]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Clausse]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Correlation of methane emissions with cattle population in Argentine Pampas]]></article-title>
<source><![CDATA[Atmospheric Environment]]></source>
<year>2010</year>
<volume>44</volume>
<numero>23</numero>
<issue>23</issue>
<page-range>2780-6</page-range></nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="book">
<collab>IPCC (Intergovernmental Panel on Climate Change)</collab>
<source><![CDATA[United Nations Environment Programme. Assessment Report 4: Contribution of Working Groups I, II and III to the Fourth Assessment Report]]></source>
<year>2007</year>
<publisher-loc><![CDATA[Geneva. Switzerland ]]></publisher-loc>
<publisher-name><![CDATA[Intergovernmental Panel on ClimateChange]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="book">
<collab>IPCC</collab>
<article-title xml:lang=""><![CDATA[Summary for Policymakers]]></article-title>
<source><![CDATA[Climate Change 2014, Mitigation of climate change. Contribution of Working Group III to the fifth Assessment Report]]></source>
<year>2014</year>
<publisher-name><![CDATA[Intergovernmental Panel on Climate Change]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Johnson]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Huyler.]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Westberg]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Lamb]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Zimmarman]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Measurmente of methane emissions from ruminant livestock using a sulfur hexafluoride tracer technique]]></article-title>
<source><![CDATA[Environ. Sci. Technol.]]></source>
<year>1994</year>
<volume>28</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>359-62</page-range></nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Johnson]]></surname>
<given-names><![CDATA[K. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Westberg]]></surname>
<given-names><![CDATA[H. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Michel]]></surname>
<given-names><![CDATA[J. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Cossalman]]></surname>
<given-names><![CDATA[M. W.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The SF6 tracer technique: Methane measurement from ruminants]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Makkar]]></surname>
<given-names><![CDATA[H. P. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Vercoe]]></surname>
<given-names><![CDATA[P. E. IAEA.]]></given-names>
</name>
</person-group>
<source><![CDATA[measuring methane production from ruminants]]></source>
<year>2007</year>
<page-range>33-67</page-range></nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Machado]]></surname>
<given-names><![CDATA[F. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Rodriguez]]></surname>
<given-names><![CDATA[N. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Gonçalves]]></surname>
<given-names><![CDATA[L. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Ribas]]></surname>
<given-names><![CDATA[M. N.]]></given-names>
</name>
<name>
<surname><![CDATA[Rodrigues]]></surname>
<given-names><![CDATA[J. A. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Pereira]]></surname>
<given-names><![CDATA[L. G. R.]]></given-names>
</name>
</person-group>
<source><![CDATA[Emissão de metano entérico por ovinos alimentados com silagens de sorgo]]></source>
<year>2011</year>
<conf-name><![CDATA[ Reunião anual da sociedade brasileira de zootecnia. O desenvolvimento da produção animal e a responsabilidade frente a novos desafios: anais]]></conf-name>
<conf-loc>Belém, Brazil </conf-loc>
</nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Martínez]]></surname>
<given-names><![CDATA[J. F.]]></given-names>
</name>
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Brunetti]]></surname>
<given-names><![CDATA[M. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Cora]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Frossasco]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Lucini]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Moreno]]></surname>
<given-names><![CDATA[M. V.]]></given-names>
</name>
<name>
<surname><![CDATA[Martínez]]></surname>
<given-names><![CDATA[M. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Colombatto]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<source><![CDATA[Evaluación in vitro del potencial antimetanogínico de aceites esenciales extraídos de plantas nativas de Argentina]]></source>
<year>2014</year>
<conf-name><![CDATA[ primera conferencia de gases de efecto invernadero en sistemas agropecuarios de Latinoamérica, 54]]></conf-name>
<conf-loc>Chile </conf-loc>
<page-range>95-6</page-range></nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mayorga]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<name>
<surname><![CDATA[Angarita]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Zambrano]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Cardozo]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Ospina]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<source><![CDATA[Emisiones de metano entérico en novillos cebú con y sin la inclusión de Guazuma ulmifolia sobre dietas de Panicum maximun en el caribe seco colombiano]]></source>
<year>2014</year>
<conf-name><![CDATA[ primera conferencia de gases de efecto invernadero en sistemas agropecuarios de Latinoamérica, 54]]></conf-name>
<conf-loc>Chile </conf-loc>
<page-range>97-8</page-range></nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Messana]]></surname>
<given-names><![CDATA[D. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Canesin]]></surname>
<given-names><![CDATA[R. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Fiorentini]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Reis]]></surname>
<given-names><![CDATA[R. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Arcuri]]></surname>
<given-names><![CDATA[P. B.]]></given-names>
</name>
<name>
<surname><![CDATA[Berchielli]]></surname>
<given-names><![CDATA[T. T.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Intake, performance and estimated methane production of Nellore steers fed soybean grain]]></article-title>
<source><![CDATA[Rev. Bras. Zoot.]]></source>
<year>2014</year>
<volume>43</volume>
<numero>12</numero>
<issue>12</issue>
<page-range>662-9</page-range></nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Moreira]]></surname>
<given-names><![CDATA[G. D.]]></given-names>
</name>
<name>
<surname><![CDATA[Lima]]></surname>
<given-names><![CDATA[P. T.]]></given-names>
</name>
<name>
<surname><![CDATA[Borges]]></surname>
<given-names><![CDATA[B. O.]]></given-names>
</name>
<name>
<surname><![CDATA[Primavesi]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<name>
<surname><![CDATA[Longo]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[McManus]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Abdalla]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Louvandini]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Tropical tanniniferous legumes used as an option to mitigate sheep enteric methane emission]]></article-title>
<source><![CDATA[Tropical Animal Health and Production]]></source>
<year>2013</year>
<volume>45</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>879-82</page-range></nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Muñoz]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Hube]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Morales]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Yan]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Ungerfeld]]></surname>
<given-names><![CDATA[E. M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effects of concentrate supplementation on enteric methane emissions and milk production of grazing dairy cows]]></article-title>
<source><![CDATA[Livestock Sci.]]></source>
<year>2015</year>
<volume>175</volume>
<page-range>37-46</page-range></nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Orskov]]></surname>
<given-names><![CDATA[E. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Flatt]]></surname>
<given-names><![CDATA[W. P.]]></given-names>
</name>
<name>
<surname><![CDATA[Moe]]></surname>
<given-names><![CDATA[P. W.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Fermentation balance approach to estimate extent of fermentation and efficiency of volatile fatty acid formation in ruminants]]></article-title>
<source><![CDATA[J. Dairy Sci.]]></source>
<year>1968</year>
<volume>51</volume>
<numero>9</numero>
<issue>9</issue>
<page-range>1429-35</page-range></nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pedreira]]></surname>
<given-names><![CDATA[M. D. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Primavesi]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<name>
<surname><![CDATA[Lima]]></surname>
<given-names><![CDATA[M. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Frighetto]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[De Oliveira]]></surname>
<given-names><![CDATA[S. G.]]></given-names>
</name>
<name>
<surname><![CDATA[Berchielli]]></surname>
<given-names><![CDATA[T.T.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Ruminal methane emission by dairy cattle in southeast brazil.]]></article-title>
<source><![CDATA[Scientia Agricola.]]></source>
<year>2009</year>
<volume>66</volume>
<numero>6</numero>
<issue>6</issue>
<page-range>742-50</page-range></nlm-citation>
</ref>
<ref id="B27">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Primavesi]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<name>
<surname><![CDATA[Shiraishi]]></surname>
<given-names><![CDATA[F. R.T.]]></given-names>
</name>
<name>
<surname><![CDATA[Pedreira]]></surname>
<given-names><![CDATA[M. S.]]></given-names>
</name>
<name>
<surname><![CDATA[de Lima]]></surname>
<given-names><![CDATA[M. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Berchielli]]></surname>
<given-names><![CDATA[T. T.]]></given-names>
</name>
<name>
<surname><![CDATA[Barbosa]]></surname>
<given-names><![CDATA[P. F.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Metano entérico de bovinos leiteiros em condições tropicais brasileiras]]></article-title>
<source><![CDATA[Pesquisa Agropecuária Brasileira]]></source>
<year>2004</year>
<volume>39</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>277-83</page-range></nlm-citation>
</ref>
<ref id="B28">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Angarita]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Mestra]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Mancipe]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Ariza]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Mayorga]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
</person-group>
<source><![CDATA[Evaluación del efecto del aceite esencial de orégano nativo del alto patía sobre la metanogenesis ruminal en novillas del trópico alto de Colombia]]></source>
<year>2014</year>
<conf-name><![CDATA[ primera conferencia de gases de efecto invernadero en sistemas agropecuarios de LA., 54]]></conf-name>
<conf-loc>Chile </conf-loc>
<page-range>93-4</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
