<?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>2730-5066</journal-id>
<journal-title><![CDATA[Agrociencia Uruguay]]></journal-title>
<abbrev-journal-title><![CDATA[Agrocienc. Urug.]]></abbrev-journal-title>
<issn>2730-5066</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Agronomía - Instituto de Nacional de Investigación Agropecuaria]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2730-50662024000201305</article-id>
<article-id pub-id-type="doi">10.31285/agro.28.1202</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[OLE! Dairy model: Description and evaluation of the biophysical components of a whole farm simulation model for pastoral-based dairy systems]]></article-title>
<article-title xml:lang="es"><![CDATA[OLE! Modelo lechero: Descripción y evaluación de los componentes biofísicos de un modelo de simulación de granja completa para sistemas lecheros de base pastoril]]></article-title>
<article-title xml:lang="pt"><![CDATA[OLE! Modelo leiteiro: Descrição e avaliação dos componentes biofísicos de um mo-delo de simulação de fazenda inteira para sistemas leiteiros pastoris]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Llanos]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Candioti]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Stirling]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cajarville]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fariña]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Diéguez]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de la República Facultad de Agronomía Departamento de Sistemas Ambientales]]></institution>
<addr-line><![CDATA[Montevideo ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Salto Agro S. S.  ]]></institution>
<addr-line><![CDATA[ Santa Fe]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Nacional de Investigación Agropecuaria (INIA) Programa Nacional de Investigación en Producción de Leche ]]></institution>
<addr-line><![CDATA[ Colonia]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de la República Facultad de Veterinaria Departamento de Producción Animal y Salud de Sistemas Productivos (IPAV)]]></institution>
<addr-line><![CDATA[San José ]]></addr-line>
<country>Uruguay</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<volume>28</volume>
<numero>nspe1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_arttext&amp;pid=S2730-50662024000201305&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_abstract&amp;pid=S2730-50662024000201305&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_pdf&amp;pid=S2730-50662024000201305&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The process of intensification of the dairy sector has been characterized in recent decades by the increase in milk production per hectare, the increase in livestock density, the inclusion of more concentrates in the diet, and the improvement of the genetic merit of dairy cows. The use of models has productive, environmental, and economic advantages. The objectives of the study were to describe a new model, &#8220;OLE! Dairy model&#8221;, to (a) simulate the biophysical performance of a pasture-based dairy production system; (b) evaluate the predictive capacity of the model with a set of statistical parameters, comparing its results with the biophysical performance of experimental studies of dairy farm systems, and (c) calibrate by adjusting the technical coefficient. The experimental design combines two feeding strategies with a different proportion of pasture in the diet and two animal genotypes. We make a description of the biophysical component and the calculations proposed in the &#8220;OLE! Dairy model&#8221;. Then a variety of parameters was calculated for model testing, including the Mean Squared Error, the Relative Prediction Error, the square root of the MSE, the Concordance Correlation Coefficient, and the Model Efficiency. The model presented a good predictive capacity for stocking rate and concentrate, pasture, and reserve intake. The predictive capacity of the model for individual production and area production improves after performing a rapid calibration, which allows for avoiding overestimations or underestimations that generate erroneous measurements in the planning and management of milk production systems, and can be adjusted to different conditions of production of the region.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: El proceso de intensificación del sector lechero se ha caracterizado en las últimas décadas por el aumento de la producción por hectárea, el aumento de la carga animal, la inclusión de más concentrados en la dieta y la mejora del mérito genético de las vacas. El uso de modelos tiene ventajas productivas, ambientales y económicas. Los objetivos del estudio fueron describir un nuevo modelo, &#8220;OLE! Modelo lechero&#8221;, para (a) simular el desempeño biofísico del sistema de producción lechero basado en pastos; (b) evaluar la capacidad predictiva del modelo con un conjunto de parámetros estadísticos, comparando sus resultados con el desempeño biofísico de un estudio experimental, y (c) calibrar ajustando el coeficiente técnico. El diseño experimental combina dos estrategias de alimentación con diferente proporción de pasto en la dieta y dos genotipos animales. Realizamos una descripción del componente biofísico y los cálculos propuestos en el &#8220;OLE! Modelo lechero&#8221;. Luego se calculó una variedad de parámetros para la prueba del modelo, incluido el cuadrado medio del error, el error de predicción relativo, la raíz cuadrada del cuadrado medio del error, el coeficiente de correlación de concordancia y la eficiencia del modelo. El modelo presentó una buena capacidad predictiva para la carga animal y el consumo de concentrado, pasto y reserva. La capacidad predictiva del modelo para la producción individual y por área mejora luego de realizar una rápida calibración, lo que permite evitar sobreestimaciones o subestimaciones que generen mediciones erróneas en la planificación y la gestión de los sistemas de producción de leche, y puede ajustarse a diferentes condiciones de producción de la región.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo: O processo de intensificação do setor leiteiro tem sido caracterizado nas últimas décadas pelo aumento da produção de leite por hectare, aumento da densidade pecuária, inclusão de mais concentrados na dieta e melhoria do mérito genético das vacas leiteiras. O uso de modelos tem vantagens produtivas, ambientais e econômicas. Os objetivos do estudo foram descrever um novo modelo &#8220;OLE! Modelo leiteiro&#8221; para simular (a) o desempenho biofísico do sistema de produção leiteira a pasto; (b) avaliar a capacidade preditiva do modelo com um conjunto de parâmetros estatísticos, comparando seus resultados com o desempenho biofísico de estudos experimentais de sistemas de fazendas leiteiras e (c) calibrar ajustando o coeficiente técnico. O delineamento experimental combina duas estratégias de alimentação com diferentes proporções de pasto na dieta e dois genótipos de animais. Fazemos uma descrição da componente biofísica e dos cálculos propostos no &#8220;OLE! Modelo de laticínios&#8221;, então uma variedade de parâmetros foi calculada para teste do modelo, incluindo o erro quadrático médio, o erro de previsão relativo, a raiz quadrada do erro quadrático médio, o coeficiente de correlação de concordância e a eficiência do modelo. O modelo apresentou boa capacidade preditiva para taxa de lotação e consumo de concentrado, pasto e reserva. A capacidade preditiva do modelo para produção individual e por área melhora após realizar uma calibração rápida, o que permite evitar superestimações ou subestimações que geram medições errôneas no planejamento e gestão de sistemas de produção de leite, podendo ser ajustado às diferentes condições de produção da região.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[calibration]]></kwd>
<kwd lng="en"><![CDATA[milk production]]></kwd>
<kwd lng="en"><![CDATA[model testing]]></kwd>
<kwd lng="en"><![CDATA[pasture-based dairy]]></kwd>
<kwd lng="en"><![CDATA[statistical analysis]]></kwd>
<kwd lng="es"><![CDATA[análisis estadístico]]></kwd>
<kwd lng="es"><![CDATA[calibración]]></kwd>
<kwd lng="es"><![CDATA[modelo]]></kwd>
<kwd lng="es"><![CDATA[pastoreo]]></kwd>
<kwd lng="es"><![CDATA[producción de leche]]></kwd>
<kwd lng="pt"><![CDATA[análise estatística]]></kwd>
<kwd lng="pt"><![CDATA[fazenda inteira]]></kwd>
<kwd lng="pt"><![CDATA[pastagem]]></kwd>
<kwd lng="pt"><![CDATA[produção de leite]]></kwd>
<kwd lng="pt"><![CDATA[teste de modelo]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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