<?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>0864-0394</journal-id>
<journal-title><![CDATA[Pastos y Forrajes]]></journal-title>
<abbrev-journal-title><![CDATA[Pastos y Forrajes]]></abbrev-journal-title>
<issn>0864-0394</issn>
<publisher>
<publisher-name><![CDATA[Estación Experimental de Pastos y Forrajes Indio Hatuey]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0864-03942023000100007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Evaluación de la sostenibilidad energética en un agroecosistema lechero convencional]]></article-title>
<article-title xml:lang="en"><![CDATA[Evaluation of energy sustainability in a conventional dairy agroecosystem]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alvarez-Lima]]></surname>
<given-names><![CDATA[Jenifer]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Morejón-Mesa]]></surname>
<given-names><![CDATA[Yanoy]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Oliva-Suárez]]></surname>
<given-names><![CDATA[José Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[del Pozo-Rodríguez]]></surname>
<given-names><![CDATA[Pedro Pablo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Agraria de La Habana Facultad de Agronomía Departamento de Producción Agrícola]]></institution>
<addr-line><![CDATA[San José de las Lajas Mayabeque]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Agraria de La Habana Facultad de Ciencias Técnicas ]]></institution>
<addr-line><![CDATA[San José de las Lajas Mayabeque]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Escuela Ramal del Ministerio de la Agricultura  ]]></institution>
<addr-line><![CDATA[San José de las Lajas Mayabeque]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Organización de las Naciones Unidas para la Alimentación y la Agricultura (FAO)  ]]></institution>
<addr-line><![CDATA[La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<volume>46</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0864-03942023000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0864-03942023000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0864-03942023000100007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Objetivo: Evaluar la sostenibilidad energética de la producción lechera en un agroecosistema convencional. Materiales y Métodos: Se diseñó el diagrama del sistema de acuerdo con los flujos energéticos implicados en las producciones de dos años consecutivos. Se determinó la energía invertida en la obtención de los materiales y servicios utilizados para producir la leche y se calcularon e interpretaron los índices de desempeño energético tradicionales y modificados: transformidad, renovabilidad, razón de rendimiento energético, razón de inversión energética, razón de carga ambiental e índice de sostenibilidad. Se determinaron los indicadores económicos: ingreso neto, costos totales, beneficio bruto y relación beneficio/costo. Resultados: Los indicadores energéticos expresaron que bajo el modelo productivo actual el agroecosistema es insostenible (0,9) en el tiempo. Se registraron altos gastos energéticos (2,98 E+06 y 3,28 E+06 seJ/J), bajo soporte a partir de fuentes renovables (33,8 y 38,5 %), adecuado potencial para producir energía primaria (1,51 y 1,63), elevada dependencia de recursos externos (1,96 y 1,60) y bajo impacto ambiental (1,96 y 1,60). Sin embargo, el análisis económico clásico mostró la rentabilidad del sistema (2,12 y 1,80 CUP). Conclusiones: Los indicadores energéticos expresaron la incapacidad del agroecosistema para sostenerse en el tiempo bajo un diseño convencional de la producción. El análisis económico clásico demostró la rentabilidad del agroecosistema, mientras que la evaluación de síntesis energética señaló que es insostenible.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Objective: To evaluate the energy sustainability of milk production in a conventional agroecosystem. Materials and Methods: The system diagram was designed according to the energy flows involved in the productions of two consecutive years. The energy invested in obtaining the materials and services used to produce milk was determined and the traditional and modified energy performance indexes were calculated and interpreted: transformity, renewability, energy yield ratio, energy investment ratio, environmental load ratio and sustainability index. Economic indicators were determined: net income, total costs, gross profit and profit/cost ratio. Results: The energy indicators showed that under the current production model the agroecosystem is unsustainable (0,9) over time. High energy costs (2,98 E+06 and 3,28 E+06 seJ/J), low support from renewable sources (33,8 and 38,5 %), adequate potential to produce primary energy (1,51 and 1,63), high dependence on external resources (1,96 and 1,60) and low environmental impact (1,96 and 1,60) were recorded. However, the classical economic analysis showed profitability of the system (2,12 and 1,80 CUP). Conclusions: The energy indicators expressed the inability of the agroecosystem to sustain itself over time under a conventional design of production. The classical economic analysis demonstrated the profitability of the agroecosystem; while the energy synthesis evaluation indicated that it is unsustainable.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[análisis económico]]></kwd>
<kwd lng="es"><![CDATA[energía]]></kwd>
<kwd lng="es"><![CDATA[producción lechera]]></kwd>
<kwd lng="en"><![CDATA[economic analysis]]></kwd>
<kwd lng="en"><![CDATA[energy]]></kwd>
<kwd lng="en"><![CDATA[milk production]]></kwd>
</kwd-group>
</article-meta>
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