<?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>S2007-11242020000300905</article-id>
<article-id pub-id-type="doi">10.22319/rmcp.v11i3.5127</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Tiempo de manejo y algunas conductas relacionadas con el estrés al manejar grupos grandes o reducidos de ganado en mangas rectas]]></article-title>
<article-title xml:lang="en"><![CDATA[Effect of group size on processing time and some stress-related behaviors in cattle in straight chutes]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Damián]]></surname>
<given-names><![CDATA[Miguel Ángel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguirre]]></surname>
<given-names><![CDATA[Virginio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Orihuela]]></surname>
<given-names><![CDATA[Agustín]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pedernera]]></surname>
<given-names><![CDATA[Mariana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas]]></surname>
<given-names><![CDATA[Saúl]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Olivares]]></surname>
<given-names><![CDATA[Jaime]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma del Estado de Morelos Facultad de Ciencias Agropecuarias ]]></institution>
<addr-line><![CDATA[Cuernavaca Morelos]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Guerrero Facultad de Medicina Veterinaria y Zootecnia ]]></institution>
<addr-line><![CDATA[Altamirano Guerrero]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2020</year>
</pub-date>
<volume>11</volume>
<numero>3</numero>
<fpage>905</fpage>
<lpage>913</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11242020000300905&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11242020000300905&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11242020000300905&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El objetivo del presente estudio fue evaluar el tiempo de manejo y el comportamiento indicativo de estrés en bovinos durante su paso por una manga recta. Se utilizaron ocho hatos de 50 animales Brahman x Pardo Suizo, cada hato constituido proporcionalmente por animales jóvenes, adultos, machos y hembras. Cuatro hatos se asignaron al azar a cada uno de los dos tratamientos: en el primer tratamiento, el hato se manejó en grupos de 4-5 animales (TS), mientras que, en el segundo, se manejó en grupos de 10 a 12 animales (TG). El manejo consistió en llevar los animales a través de una manga de 13 m de longitud donde recibieron una aplicación subcutánea de Ivermectina al 1%. Durante su paso por la manga, el tiempo promedio para manejar a los animales en cada tratamiento (42.5 ± 2.2 vs 51.04 ± 1.9 min; P&lt;0.05), así como el número de animales que vocalizaron (5.5 ± 0.6 vs 7.7±0.2; P&lt;0.05), se regresaron (6.3 ± 0.4 vs 9.5 ± 0.6; P&lt;0.05) y saltaron sobre sus compañeros (2.7 ± 0.5 vs 5.2 ± 0.5; P&lt;0.05), fue menor en TS que en TG. Sin embargo, no se encontró diferencia entre los tratamientos (P&gt;0.05) para el número de animales que se golpearon (TS: 2.7 ± 0.4 y TG: 5.5 ± 1.7) o se cayeron (TS: 2 ± 0.4 y TG: 3.7 ± 1.0). Se concluye que el manejo de bovinos en grupos pequeños requiere menos tiempo y puede ser menos estresante y peligroso que cuando se manejan grupos más numerosos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Stress during handling can affect welfare in beef cattle and pose a risk to handlers. An evaluation was done of processing time and stress-related behavior (vocalization, turning, jumping, hitting, falling) in cattle during transit through a straight chute. Eight herds of 50 Brahman x Swiss Brown animals each were processed over an 8-d period. Each herd contained the same proportions of young to adult animals, and female to male ratios. Four herds were processed in small groups of four to five animals (TS), and the remaining four in groups of ten to twelve animals (TG). Processing involved moving the animals through a 13-m long straight chute during which they were injected with 1% Ivermectin. Processing time was shorter (P&lt;0.05) in the TS (42.5 ± 2.2 min) than in the TG (51.04 ± 1.9 min). Vocalization (5.5 ± 0.6 vs 7.7±0.2), turning (6.3 ± 0.4 vs. 9.5 ± 0.6), and jumping (2.7 ± 0.5 vs. 5.2 ± 0.5) occurred less frequently (P&lt;0.05) in the TS than in the TG. No differences between treatments (P&gt;0.05) were observed for hitting (TS: 2.7 ± 0.4; TG: 5.5 ± 1.7) or falling (TS: 2 ± 0.4; TG: 3.7 ± 1.0). Processing small groups resulted in shorter processing times, less stress to animals and lower risk of injury to animals and handlers. This practice is a viable option for improving processing efficiency and animal welfare in semi-intensive tropical beef cattle systems.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Bienestar animal]]></kwd>
<kwd lng="es"><![CDATA[Conducta]]></kwd>
<kwd lng="es"><![CDATA[Instalaciones]]></kwd>
<kwd lng="es"><![CDATA[Manga de manejo]]></kwd>
<kwd lng="en"><![CDATA[Animal welfare]]></kwd>
<kwd lng="en"><![CDATA[Behavior]]></kwd>
<kwd lng="en"><![CDATA[Installations]]></kwd>
<kwd lng="en"><![CDATA[Straight chute]]></kwd>
</kwd-group>
</article-meta>
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