<?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>2301-1548</journal-id>
<journal-title><![CDATA[Agrociencia (Uruguay)]]></journal-title>
<abbrev-journal-title><![CDATA[Agrociencia Uruguay]]></abbrev-journal-title>
<issn>2301-1548</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Agronomía - Instituto Nacional de Investigación Agropecuaria]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2301-15482020000202303</article-id>
<article-id pub-id-type="doi">10.31285/agro.24.48</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[EMAG - National model for evaluating environmental impacts of cattle production systems in Uruguay]]></article-title>
<article-title xml:lang="es"><![CDATA[EMAG - Modelo nacional para evaluar impactos ambientales de sistemas de producción ganadera en Uruguay]]></article-title>
<article-title xml:lang="pt"><![CDATA[EMAG - Modelo nacional de evaluação de impactos ambientais dos sistemas de produção pecuária no Uruguai]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Becoña]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ledgard]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Astigarraga]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lizarralde]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dieguez]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Morales]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Plan Agropecuario  ]]></institution>
<addr-line><![CDATA[Montevideo ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,AgResearch  ]]></institution>
<addr-line><![CDATA[Hamilton ]]></addr-line>
<country>New Zealand</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de la República Facultad de Agronomía ]]></institution>
<addr-line><![CDATA[Montevideo ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Nacional de Investigación Agropecuaria  ]]></institution>
<addr-line><![CDATA[Montevideo ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad de la República Facultad de Veterinaria ]]></institution>
<addr-line><![CDATA[Montevideo ]]></addr-line>
<country>Uruguay</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<volume>24</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_arttext&amp;pid=S2301-15482020000202303&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_abstract&amp;pid=S2301-15482020000202303&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_pdf&amp;pid=S2301-15482020000202303&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Cattle and sheep systems in Uruguay and worldwide are challenged to reduce their environmental footprint while increasing efficiency and production. To achieve this challenge, user-friendly tools are needed that can translate research findings into practical information that could improve decision making by farmers and advise different stakeholders. Despite this, there are a limited number of applied environmental models in other countries and they are typically based on productive, high-quality pasture/crop-feed systems with relatively high inputs. In contrast, cattle and sheep production in Uruguay is largely associated with extensive grazing systems on unique natural grassland systems of relatively poor feed quality and often with no nutrient inputs in fertilizers. Thus, there is a need for a model that can take account for these types of systems and bring together relevant country-specific data to provide information of relevance for Uruguay. The emag (Evaluación Medio Ambiental Ganadera) model accounts for multiple environmental and resource use indicators of nutrient (nitrogen and phosphorus) balances and losses, greenhouse gas emissions and use of fossil energy. Results are provided on a per-hectare and per-kg product basis. This decision support tool for cattle and sheep farmers systems is based on life cycle assessment (lca) methodology from &#8220;cradle-to-farm gate&#8221; for all resources use indicators. It uses national parameters and in case of lack of information is supplied from international research in pastoral systems. The model use for environmental methodology tier 2 animal energy model to account for key animal productivity and management practices. emag is a user-friendly model that requires basic information for a farm system divided into land use (forage types used uniquely for natural grassland in Uruguay), animal management (beef cattle and sheep), farm inputs (fertilizers, supplementary feeds, seeds and agrochemicals) and fossil energy (fuel and electricity) used in the system. emag can help to identify hot-spots of emissions and resource use, as well as to evaluate changes over time. In addition, it can be used to test cattle or sheep management practices or evaluate mitigation options within the system. By providing multiple indicators, emag can be used to provide information to avoid &#8220;trade-offs&#8221; between environmental impacts when assessing future options. As an example of usability, the paper reports a case study which showed potential benefits of improving environmental efficiency and note interesting result around negative P balance when increase productivity in a system. In summary, emag is a decision-support tool developed with the objective of evaluating the environmental performance of cattle and sheep systems, that would help farmers in decision making and different stakeholders according to their interest.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[resumen está disponible en el texto completo]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo: A pecuária no Uruguai e no mundo é desafiada a reduzir seu impacto ambiental, aumentando sua eficiência e produtividade. Para alcançar esse objetivo são necessárias ferramentas de fácil utilização que possam traduzir as descobertas da pesquisa em informações praticas para a melhoria na tomada de decisão pelos agricultores e assistência às diferentes partes interessadas. Entretanto, há um número limitado de modelos ambientais aplicados em outros países, normalmente baseados em sistemas produtivos de alta qualidade para pastagens / culturas, com uso relativamente alto de insumos. Em contraste, a produção de bovinos e ovinos no Uruguai está amplamente associada ao pastoreio extensivo em sistemas naturais de pastagens nativas, com qualidade nutricional relativamente baixa e geralmente sem o uso de fertilizantes. Portanto, é necessário um modelo que considere esse tipo de sistema e que reúna dados relevantes de cada país para fornecer informações relevantes às condições do Uruguai. O modelo EMAG (Evaluación Medio Ambiental Ganadera) reúne vários indicadores de uso ambiental e de recursos como balanços de perdas de nutrientes (nitrogênio e fósforo), emissão de gases do efeito estufa e uso de energia fóssil. Os resultados são fornecidos por hectare e por kg produzido. Essa ferramenta de apoio à decisão para sistemas pecuários (bovinos e ovinos) é baseada na metodologia de avaliação do ciclo de vida (LCA) do &#8220;berço à porteira&#8221; para todos os indicadores de uso de recursos. Utiliza parâmetros nacionais e, em sua na ausência, obtêm-se de pesquisas internacionais em sistemas pastoris. O modelo utiliza como metodologia ambiental a referência de energia para animais de nível 2 na avaliação das principais práticas de produtividade e manejo animal. O EMAG é um modelo de fácil uso e que requer informações básicas para um sistema agrícola dividido em uso da terra (tipos de forragem usados exclusivamente para pastagens naturais no Uruguai), manejo animal (bovinos e ovinos), insumos agrícolas (fertilizantes, alimentos suplementares, sementes e agroquímicos) e energia fóssil (combustível e eletricidade) usada no sistema. O EMAG pode ajudar a identificar pontos críticos de emissão e uso de recursos, bem como avaliar mudanças ao longo do tempo. Além disso, pode ser usado para testar práticas de manejo de bovinos e ovinos ou avaliar opções de mitigação dentro do sistema. Ao fornecer vários indicadores, o EMAG pode ser usado para fornecer informações para minimizar &#8220;compensações&#8221; entre impactos ambientais ao avaliar opções futuras. Como exemplo de usabilidade, o artigo relata um estudo de caso no qual os benefícios potenciais de melhoria na eficiência ambiental evidenciam resultados interessantes em torno do balanço P negativo decorrente do incremento da produtividade em um sistema. Em resumo, o EMAG é uma ferramenta de apoio à definição de ações desenvolvida com o objetivo de avaliar o desempenho ambiental dos sistemas pecuários para auxílio dos agricultores na tomada de decisões e nas diferentes partes interessadas, de acordo com seus interesses.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[environment]]></kwd>
<kwd lng="en"><![CDATA[grazing systems]]></kwd>
<kwd lng="en"><![CDATA[cattle]]></kwd>
<kwd lng="en"><![CDATA[model]]></kwd>
<kwd lng="es"><![CDATA[medioambiente]]></kwd>
<kwd lng="es"><![CDATA[sistemas de pastoreo]]></kwd>
<kwd lng="es"><![CDATA[ganado]]></kwd>
<kwd lng="es"><![CDATA[modelo]]></kwd>
<kwd lng="pt"><![CDATA[meio ambiente]]></kwd>
<kwd lng="pt"><![CDATA[sistemas de pastoreio]]></kwd>
<kwd lng="pt"><![CDATA[pecuária]]></kwd>
<kwd lng="pt"><![CDATA[modelo]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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