<?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>1659-1321</journal-id>
<journal-title><![CDATA[Agronomía Mesoamericana]]></journal-title>
<abbrev-journal-title><![CDATA[Agron. Mesoam]]></abbrev-journal-title>
<issn>1659-1321</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1659-13212019000200469</article-id>
<article-id pub-id-type="doi">10.15517/am.v30i2.33849</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Validación y desarrollo de ecuaciones predictoras de peso para caballos iberoamericanos en Costa Rica]]></article-title>
<article-title xml:lang="en"><![CDATA[Validation and determination of equations prediction weight for Ibero-American horses in Costa Rica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Solano-Mora]]></surname>
<given-names><![CDATA[Grethel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<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-group>
<aff id="Af1">
<institution><![CDATA[,Criadero Los Tres Potrillos  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Costa Rica  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2019</year>
</pub-date>
<volume>30</volume>
<numero>2</numero>
<fpage>469</fpage>
<lpage>481</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-13212019000200469&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-13212019000200469&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-13212019000200469&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Introducción. Una limitante en los sistemas de producción es el pesaje de los animales, actividad que se realiza de forma empírica o con el uso de cintas de estimación de peso que generan sobre-estimaciones. Objetivo. El objetivo fue validar en caballos iberoamericanos catorce ecuaciones predictoras de peso y desarrollar propias de la raza para Costa Rica. Materiales y métodos. La investigación se realizó entre los meses de septiembre de 2016 y marzo de 2017. Se tomaron las medidas alométricas de peso (kg), longitud (cm), altura a la cruz (cm), perímetro torácico (cm), perímetro umbilical (cm) y edad (meses) de 152 animales (machos y hembras), registrados en la Asociación Centroamericana de Criadores de Caballos de raza iberoamericana. Producto del análisis de la información, se desarrolló una curva de crecimiento para machos (y = 94,54 ln(X) 6 47,14; R2=0,858) y hembras (y=82,09 ln(x)+86,81; R2=0,744). Resultados. De las ecuaciones evaluadas, se determinó que doce permitieron predecir el peso del animal cuando es un potro (p&lt;0,05), cinco cuando se considera joven (p&lt;0,05), seis cuando está en proceso de doma (p&lt;0,05) y seis cuando es adulto (p&lt;0,05). Se determinaron sobre-estimaciones de peso de los animales entre 29,84 y 168,17 kg de peso vivo, según la ecuación utilizada. De igual manera, las ecuaciones desarrolladas hacen uso de las medidas corporales y edad de los animales, con sobre-estimaciones de peso entre 0,67 y 2,17 kg por animal, lo que permitió tener una mejor predicción del peso y así, mejorar la determinación de los requerimientos nutricionales, dosificaciones de productos veterinarios y el manejo de los animales. Conclusión. Se generaron dos ecuaciones que permitieron estimar el peso del caballo iberoamericano, como también se descartaron las ecuaciones disponibles en la literatura, que no permitieron una estimación del peso según la etapa productiva del animal.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Introduction. A limitation in production systems is the weighing of animal, an activity that is performed empirically or with the use of weight estimation tapes which generate overestimates. Objective. The objective was to validate fourteen weigh predictive equations in Ibero-American horses, and develop the breed&#8217;s own equations for Costa Rica. Material and methods. The investigation was carried out between the months of September 2016 and March 2017. Allometrics measurements of weight (kg), length (cm), height at the withers (cm), thoracic perimeter (cm), umbilical perimeter (cm), and age (months) of 152 animals (male and female) registered in the Asociación Centroamericana de Criadores de Caballos de raza iberoamericana, were taken. As a result on the analysis of the information, a growth curve was developed for males (y= 94.54 ln(X) 6 47.14; R2=0.858) and females (y=82.09 ln(x)+86.81; R2=0.744). Results. From the equations evaluated, it was determined that twelve allowed to predict the weight of the animal when it is a colt (p&lt;0.05), five when it is considered young (p&lt;0.05), six when it is in the process of dressage (p&lt;0.05), and six it when it is adult (p&lt;0.05).According to the equation used, weight overestimates of animals between 29.84kg and 168.17kg live weight were determined. Similarly, the developed equations make use of the body measurements and age of the animals, with overestimates of weight between 0.67 and 2.17 kg per animal, which allowed having a better weight prediction and thus improving the determination of the nutritional requirements, dosages of veterinary products, and the handling of the animals. Conclusion. Two equations were generated to estimate the weight of the Ibero-American horses, as well as discarding the equations available in the literature, which did not allow an estimation of the weight according to the productive stage of the animal.]]></p></abstract>
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<kwd lng="es"><![CDATA[equinos]]></kwd>
<kwd lng="es"><![CDATA[pesada]]></kwd>
<kwd lng="es"><![CDATA[medición del cuerpo]]></kwd>
<kwd lng="es"><![CDATA[biometría]]></kwd>
<kwd lng="es"><![CDATA[edad]]></kwd>
<kwd lng="en"><![CDATA[equine]]></kwd>
<kwd lng="en"><![CDATA[weighing]]></kwd>
<kwd lng="en"><![CDATA[body measurements]]></kwd>
<kwd lng="en"><![CDATA[biometry]]></kwd>
<kwd lng="en"><![CDATA[age]]></kwd>
</kwd-group>
</article-meta>
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