<?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>2007-1124</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias pecuarias]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. de cienc. pecuarias]]></abbrev-journal-title>
<issn>2007-1124</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-11242019000300767</article-id>
<article-id pub-id-type="doi">10.22319/rmcp.v10i3.4911</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Development and evaluation of equations to predict body weight of Pelibuey ewes using heart girth]]></article-title>
<article-title xml:lang="es"><![CDATA[Desarrollo y evaluación de ecuaciones para predecir el peso corporal de ovejas Pelibuey mediante la circunferencia torácica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chay-Canul]]></surname>
<given-names><![CDATA[Alfonso J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Herrera]]></surname>
<given-names><![CDATA[Ricardo A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Salazar-Cuytún]]></surname>
<given-names><![CDATA[Rosario]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ojeda-Robertos]]></surname>
<given-names><![CDATA[Nadia F.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz-Hernández]]></surname>
<given-names><![CDATA[Aldenamar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fonseca]]></surname>
<given-names><![CDATA[Mozart A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Canul-Solís]]></surname>
<given-names><![CDATA[Jorge R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Juárez Autónoma de Tabasco División Académica de Ciencias Agropecuarias ]]></institution>
<addr-line><![CDATA[Villahermosa Tabasco]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Yucatán Facultad de Medicina Veterinaria y Zootecnia ]]></institution>
<addr-line><![CDATA[Mérida Yucatán]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,University of Nevada Department of Agriculture Nutrition &amp; Veterinary Sciences ]]></institution>
<addr-line><![CDATA[Reno Nevada]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Tecnológico Nacional de México Instituto Tecnológico de Tizimín ]]></institution>
<addr-line><![CDATA[ Yucatán]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2019</year>
</pub-date>
<volume>10</volume>
<numero>3</numero>
<fpage>767</fpage>
<lpage>777</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11242019000300767&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11242019000300767&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11242019000300767&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The main objective was to develop equations to predict body weight (BW) using heart girth (HG) in Pelibuey ewes. A second objective was to evaluate this model for precision using an independent dataset. For model develop a data set composed by 366, 2-3-yr-old, non-pregnant and non-lactating ewes; with a mean BW of 45.7 ± 9.16 kg and HG of 87.55 ± 7.93 cm was used. A linear equation was fitted: BW= -47.97 (±2.01) + 1.07 (±0.02)×HG (r2 = 0.86, Root mean square error (RMSE)= 3.46, y n= 366). A second data set composed by 67 animals, with similar characteristics (BW of 38.25 ± 8.62 kg and HG of 80.37 ± 7.03 cm) was used to evaluate the developed equations. For the evaluation, the relationship between observed and predicted values of BW by linear regression, the mean squared error of prediction (MSEP) and root MSEP (RMSEP), and concordance correlation coefficient analysis were used. The proposed equation was highly precise (R2 =0.913) and accurate (Cb=0.996) with a reproducibility index of 0.95. The MEF has indicated a higher efficiency of prediction with higher proportion of the total variance of the observed values been explained by the predicted data (0.91). The partition of the MSEP has indicated a very small mean bias (0.082). The systematic bias has shown that only 1.93 % of the error of prediction was associated with the slope and most of the error was explained by the random component indicating small biases with the predictions. The proposed equation accurately and precisely estimated the BW of non-pregnant and non-lactating Pelibuey ewe using HG and therefore is recommended to be used.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El objetivo principal fue desarrollar ecuaciones para predecir el peso corporal (PC) utilizando la circunferencia torácica (CT) en ovejas Pelibuey. Un segundo objetivo fue evaluar este modelo para determinar la precisión utilizando un conjunto de datos independiente. Para desarrollar el modelo, se utilizó un conjunto de datos compuesto por 366 ovejas de 2-3 años de edad, no gestantes y no lactantes, con una media de peso corporal de 45.7 ± 9.16 kg y una CT de 87.55 ± 7.93 cm. Se ajustó una ecuación lineal: PC= -47.97 (± 2.01) + 1.07 (± 0.02) × HG (r2= 0.86, raíz del cuadrado medio del error (RMSE)= 3.46, y n= 366). Un segundo conjunto de datos compuesto por 67 animales con características similares (PC de 38.25 ± 8.62 kg y CT de 80.37 ± 7.03 cm) se utilizó para evaluar las ecuaciones desarrolladas. Para la evaluación, se utilizó la relación entre los valores observados y predichos de PC por regresión lineal, el cuadrado medio del error de predicción (MSEP) y la raíz cuadrada del cuadrado medio del error de predicción (RMSEP), y el análisis del coeficiente de correlación de concordancia. La ecuación propuesta fue altamente precisa (R2 = 0.913) y exacta (Cb= 0.996), con un índice de reproducibilidad de 0.95. El MEF ha indicado una mayor eficiencia de predicción con una mayor proporción de la varianza total de los valores observados explicada por los datos previstos (0.91). La partición del MSEP indicó un sesgo medio muy pequeño (0.082). El sesgo sistemático mostró que solo 1.93 % del error de predicción se asoció con la pendiente, y la mayor parte del error fue explicada por el componente aleatorio que indica sesgos pequeños con las predicciones. La ecuación propuesta estimó con precisión y exactitud el peso corporal de las ovejas Pelibuey no gestantes y no lactantes utilizando CT, y, por lo tanto, se recomienda su uso.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Biometric measurements]]></kwd>
<kwd lng="en"><![CDATA[Pelibuey sheep]]></kwd>
<kwd lng="en"><![CDATA[Body weight]]></kwd>
<kwd lng="en"><![CDATA[Prediction]]></kwd>
<kwd lng="es"><![CDATA[Mediciones biométricas]]></kwd>
<kwd lng="es"><![CDATA[Ovejas Pelibuey]]></kwd>
<kwd lng="es"><![CDATA[Peso corporal]]></kwd>
<kwd lng="es"><![CDATA[Predicción]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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