<?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>1659-4266</journal-id>
<journal-title><![CDATA[Cuadernos de Investigación UNED]]></journal-title>
<abbrev-journal-title><![CDATA[Cuadernos de Investigación UNED]]></abbrev-journal-title>
<issn>1659-4266</issn>
<publisher>
<publisher-name><![CDATA[Universidad Estatal a Distancia de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1659-42662020000100001</article-id>
<article-id pub-id-type="doi">10.22458/urj.v12i1.2792</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estimación de la producción láctea del ganado Jersey usando variables temporales, intrínsecas y ambientales]]></article-title>
<article-title xml:lang="en"><![CDATA[Dairy production of Jersey cattle estimation using temporary, intrinsic and environmental variables]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[WingChing-Jones]]></surname>
<given-names><![CDATA[Rodolfo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Conejo-Morales]]></surname>
<given-names><![CDATA[Juan Federico]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Costa Rica Escuela de Zootecnia ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Ciudad de los Niños  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<volume>12</volume>
<numero>1</numero>
<fpage>1</fpage>
<lpage>13</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-42662020000100001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-42662020000100001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-42662020000100001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Introducción: Predecir el comportamiento de la producción láctea es una actividad constante en los sistemas de producción en busca del uso eficiente de los recursos. Objetivo: Generar un modelo matemático de predicción de la producción láctea que relacione las condiciones climáticas presentes en el momento que se recolectó la información y las características intrínsecas que presentaban los semovientes en dos sistemas de producción ubicados a 600 y 1 800m.s.n.m. en la provincia de Cartago, Costa Rica. Métodos:Utilizamos bases de datos generadas desde el 2003 al 2014, en el sistema ubicado a 660m.s.n.m. para un total de 61 animales, mientras que a 1 800m.s.n.m., la información la registramos entre 2011 al 2014, con el aporte de 387 animales. Resultados: Generamos tres ecuaciones bajo la hipótesis de que los productores no registran la información completa, la primera considera la interacción de las variables ambientales, temporales e intrínsecas del animal, mientras que las siguientes dos ecuaciones, separan el efecto ambiental y las características del animal. A 600m.s.n.m, la temperatura (-4,52), el número de lactancia (-0,99), la humedad relativa (-0,16), el mes (-0,14) y los días de lactancia (-0,02) presentaron un efecto negativo hacia la producción, mientras que la precipitación (0,0004), radiación (0,044), la edad del semoviente (0,084), y el índice de humedad y temperatura (2,68), favorecieron la productividad. En cambio a 1 800m.s.n.m., la radiación (-0,06), la humedad relativa (-0,04) y los días de lactancia (-0,03) disminuyeron la productividad del animal, por el contrario, la precipitación (0,02), el mes de evaluación (0,07) y el número de lactancia (0,57) la aumentaron. Conclusión: Estas ecuaciones son un insumo para que los responsables de los sistemas productivos, tengan una forma de seleccionar o tomar acciones para mantener la homeostasis de los animales.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Introduction: Production systems looking for efficient use of resources are continually predicting the dairy production behavior of production animals. Objective: To generate a mathematical prediction model of dairy production that associates climate conditions at the moment the information was collected with the intrinsic characteristics of the livestock in two production systems located at 600 and 1 800m.a.s.l. in Cartago, Costa Rica. Methods: We used a database created from 2003 to 2014 for the production system located at 600m.a.s.l. with a total of 61 animals, while for the system established at 1 800m.a.s.l. the information was recorded between the 2011 to 2014, with 387 animals. Results:We generated three equations under the hypothesis that the producers do not gather and record the complete information. The first one considers the interaction of environmental, temporal, and intrinsic variables of the animal, while the other two equations separate the environmental effect and the characteristics of the animal. We determined that at 600m.a.s.l. the temperature (-4,52), lactation number (-0,99), the relative humidity (-0,16), the moth (-0,14) and lactation days (-0,02) have an adverse effect on milk production, while precipitation (0,0004), radiation (0,044), the age of the animal (0,084) and humidity and temperature index (2,68) favor productivity. At the same time, at 1 800m.a.s.l. radiation (-0,06), relative humidity (-0,04) and lactating days (-0,03) decreased animal productivity, on the other hand, the assessment precipitation (0,02), month (0,07) and lactation number (0,57) increased. Conclusion: These equations are input so that those responsible for the production systems have a way to select animals or take actions to maintain animal homeostasis.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Relative humidity]]></kwd>
<kwd lng="en"><![CDATA[temperature]]></kwd>
<kwd lng="en"><![CDATA[dairycattle]]></kwd>
<kwd lng="en"><![CDATA[Bos taurus]]></kwd>
<kwd lng="en"><![CDATA[heat stress]]></kwd>
<kwd lng="es"><![CDATA[Humedad relativa]]></kwd>
<kwd lng="es"><![CDATA[temperatura ambiental]]></kwd>
<kwd lng="es"><![CDATA[ganado lechero]]></kwd>
<kwd lng="es"><![CDATA[Bos taurus]]></kwd>
<kwd lng="es"><![CDATA[estrés calórico]]></kwd>
</kwd-group>
</article-meta>
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