<?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>0301-5092</journal-id>
<journal-title><![CDATA[Veterinaria México]]></journal-title>
<abbrev-journal-title><![CDATA[Vet. Méx]]></abbrev-journal-title>
<issn>0301-5092</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Medicina Veterinaria y Zootecnia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0301-50922011000200004</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Bienestar animal en la enseñanza de Medicina Veterinaria y Zootecnia: ¿Por qué y para qué?]]></article-title>
<article-title xml:lang="en"><![CDATA[Animal Welfare in the Veterinary Medicine and Animal Husbandry Curriculum: What for and why?]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aluja]]></surname>
<given-names><![CDATA[Aline S. de]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Medicina Veterinaria y Zootecnia Departamento de Patología]]></institution>
<addr-line><![CDATA[México DF]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2011</year>
</pub-date>
<volume>42</volume>
<numero>2</numero>
<fpage>137</fpage>
<lpage>147</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0301-50922011000200004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0301-50922011000200004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0301-50922011000200004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Animal welfare is nowadays considered a science and it should be part of the curriculum of Veterinary Schools and Faculties. Present knowledge of anatomy, physiology, neurobiology and the nervous system in particular show that animals and men share many similar organic mechanisms. Observational and behavioural studies prove that animals are conscious of their surroundings and experience anxieties, fear, stress and pain. The link between animal welfare and production is mentioned and it is concluded that veterinarians must know about animal behaviour, it's physiological and neurological basis, with the objective to provide a state of wellbeing for animals which in return will favourably influence production.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se revisan brevemente las razones del porqué el Bienestar animal actualmente es considerado una ciencia que debe ser incluida en el plan de estudios de las escuelas y facultades de Medicina Veterinaria y Zootecnia. Se menciona que los conocimientos actuales sobre anatomía, fisiología, neurobiología y otros, nos comprueban que el organismo animal y en especial su sistema nervioso central (SNC) tienen muchas similitudes con los del ser humano y que los estudios observacionales y de comportamiento animal demuestran que los animales se dan cuenta, sufren ansiedad, miedo, estrés y dolor. Se subraya la relación que tiene el bienestar de los animales con la producción y se concluye que es necesario que los médicos veterinarios y zootecnistas conozcan el comportamiento de los animales, sus bases fisiológicas y neurológicas a fondo, para procurarles a un estado de bienestar que a su vez repercutirá en el éxito de su producción.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Animal welfare]]></kwd>
<kwd lng="en"><![CDATA[behaviour]]></kwd>
<kwd lng="en"><![CDATA[education]]></kwd>
<kwd lng="en"><![CDATA[animal production]]></kwd>
<kwd lng="en"><![CDATA[veterinarians]]></kwd>
<kwd lng="es"><![CDATA[Bienestar animal]]></kwd>
<kwd lng="es"><![CDATA[comportamiento]]></kwd>
<kwd lng="es"><![CDATA[educación]]></kwd>
<kwd lng="es"><![CDATA[producción animal]]></kwd>
<kwd lng="es"><![CDATA[médico veterinario zootecnista]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Art&iacute;culos de revisi&oacute;n</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Bienestar animal en la ense&ntilde;anza de Medicina Veterinaria y Zootecnia. &iquest;Por qu&eacute; y para qu&eacute;?</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="3"><b>Animal Welfare in the Veterinary Medicine and Animal Husbandry Curriculum. What for and why?</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>Aline S. de Aluja</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Departamento de Patolog&iacute;a, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Aut&oacute;noma de M&eacute;xico, Circuito Exterior, Ciudad Universitaria, 04510, M&eacute;xico, DF, Correo electr&oacute;nico:</i> <a href="mailto:aline@servidor.unam.mx">aline@servidor.unam.mx</a></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Recibido el 21 de junio de 2010.    <br> 	Aceptado el 28 de febrero de 2011.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Animal welfare is nowadays considered a science and it should be part of the curriculum of Veterinary Schools and Faculties. Present knowledge of anatomy, physiology, neurobiology and the nervous system in particular show that animals and men share many similar organic mechanisms. Observational and behavioural studies prove that animals are conscious of their surroundings and experience anxieties, fear, stress and pain. The link between animal welfare and production is mentioned and it is concluded that veterinarians must know about animal behaviour, it's physiological and neurological basis, with the objective to provide a state of wellbeing for animals which in return will favourably influence production.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Key words:</b> Animal welfare, behaviour, education, animal production, veterinarians.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Se revisan brevemente las razones del porqu&eacute; el Bienestar animal actualmente es considerado una ciencia que debe ser incluida en el plan de estudios de las escuelas y facultades de Medicina Veterinaria y Zootecnia. Se menciona que los conocimientos actuales sobre anatom&iacute;a, fisiolog&iacute;a, neurobiolog&iacute;a y otros, nos comprueban que el organismo animal y en especial su sistema nervioso central (SNC) tienen muchas similitudes con los del ser humano y que los estudios observacionales y de comportamiento animal demuestran que los animales se dan cuenta, sufren ansiedad, miedo, estr&eacute;s y dolor. Se subraya la relaci&oacute;n que tiene el bienestar de los animales con la producci&oacute;n y se concluye que es necesario que los m&eacute;dicos veterinarios y zootecnistas conozcan el comportamiento de los animales, sus bases fisiol&oacute;gicas y neurol&oacute;gicas a fondo, para procurarles a un estado de bienestar que a su vez repercutir&aacute; en el &eacute;xito de su producci&oacute;n.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Bienestar animal, comportamiento, educaci&oacute;n, producci&oacute;n animal, m&eacute;dico veterinario zootecnista.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Introducci&oacute;n</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Desde hace algunos a&ntilde;os el bienestar de los animales, tanto de los de compa&ntilde;&iacute;a como los de producci&oacute;n, de trabajo, de deporte, de espect&aacute;culos, de diversi&oacute;n, de vida silvestre, de zool&oacute;gicos y los usados en la experimentaci&oacute;n y ense&ntilde;anza, se ha vuelto un tema muy discutido en grupos importantes de la ciudadan&iacute;a, entre M&eacute;dicos Veterinarios Zootecnistas, Ingenieros Agr&oacute;nomos y en los &aacute;mbitos gubernamentales en muchos pa&iacute;ses, con repercusiones nacionales e internacionales.<sup>1&#150;11</sup> La pregunta que surgi&oacute; es &iquest;hasta d&oacute;nde son compatibles los m&eacute;todos de producci&oacute;n animal, de zootecnia, de exhibici&oacute;n y de explotaci&oacute;n de los animales con principios de bienestar animal, o inclusive de bio&eacute;tica?</font></p>  	    <p align="justify"><font face="verdana" size="2">&Eacute;ste es un tema vasto, que incluye todos los aspectos implicados en la relaci&oacute;n del hombre con los animales y en cierto modo es una de las consecuencias del explosivo crecimiento de la poblaci&oacute;n humana.</font></p>  	    <p align="justify"><font face="verdana" size="2">Para reflexionar al respecto ser&aacute; &uacute;til definir el t&eacute;rmino bienestar animal: existen varias definiciones, una, muy difundida es la de Broom:<sup>12</sup> "El bienestar de un individuo es su estado en relaci&oacute;n con sus intentos de afrontar el ambiente".</font></p>  	    <p align="justify"><font face="verdana" size="2">Otra, que me parece m&aacute;s f&aacute;cil de entender, la de Hughes:<sup>13</sup> "El bienestar es el estado de salud f&iacute;sica y mental completo donde el animal est&aacute; en armon&iacute;a con su ambiente".</font></p>  	    <p align="justify"><font face="verdana" size="2">Mc Millan<sup>14</sup> define el t&eacute;rmino de salud mental como "un estado de equilibrio mental y emocional caracterizado por la ausencia de trastornos mentales o por un ajuste adecuado en especial en lo que refiere a sentirse confortable y capaz de enfrentarse a las exigencias de la vida".</font></p>  	    <p align="justify"><font face="verdana" size="2">Mc Millan<sup>14</sup> enfatiza la importancia de la salud mental dentro del concepto de bienestar o de la calidad de vida y asegura que el bienestar f&iacute;sico es solamente una parte de un conjunto de factores necesarios para un programa de cuidado efectivo de animales.</font></p>  	    <p align="justify"><font face="verdana" size="2">Duncan<sup>15</sup> por su parte subraya que para que un animal se encuentre en un estado de bienestar no deben considerarse &uacute;nicamente sus necesidades fisiol&oacute;gicas, sino de manera primordial sus sentimientos. Explica que el sentimiento es una actividad espec&iacute;fica del sistema sensorial, del cual el animal se da cuenta y postula que <i>el bienestar depende de lo que los animales sienten.</i></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Estudiando estas definiciones, salta a la vista que para evaluar el bienestar de los animales, se requieren conocimientos cient&iacute;ficos. Para afrontar un ambiente adverso se movilizan en el organismo mecanismos complicados, principalmente hormonales, como reacci&oacute;n a factores estresantes.<sup>16</sup> Para conocer el estado de salud f&iacute;sica es necesario saber mucho de fisiolog&iacute;a,<sup>17</sup> de bioqu&iacute;mica, de las patolog&iacute;as, de cl&iacute;nica, de etolog&iacute;a entre otros, y para la salud mental se requieren, adem&aacute;s, conocimientos muy s&oacute;lidos de las neurociencias.</font></p>  	    <p align="justify"><font face="verdana" size="2">Cualquier definici&oacute;n de bienestar animal se debe referir al estado biol&oacute;gico del animal y no a algo que se le proporciona o no. Teniendo esto en cuenta, es un estado que se puede medir y que se basa en estudios fisiol&oacute;gicos y de conducta de los animales.<sup>18,19</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">En consecuencia, el bienestar animal no es, como se pens&oacute; durante mucho tiempo, una actividad de personas aficionadas y bienintencionadas, sino una ciencia que los profesionales de la Medicina Veterinaria y Zootecnia deben conocer a fondo.<sup>20&#150;22</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">En sus definiciones tanto Hughes<sup>13</sup> como Mc Millan<sup>14</sup> y Duncan<sup>15</sup> manejan el concepto de salud mental, lo que implica que aceptan que los animales tienen una mente. Un estado mental es una caracter&iacute;stica evolutiva que la selecci&oacute;n natural ha favorecido precisamente para incrementar la posibilidad de sobrevivencia.</font></p>  	    <p align="justify"><font face="verdana" size="2">Toda persona que ha vivido y trabajado con animales, sabe que sienten, que tienen miedo, experimentan frustraciones, que son capaces de demostrar alegr&iacute;a, y que tienen la capacidad de experiencias conscientes.<sup>23&#150;28</sup> Por lo tanto, ya no son aceptables las doctrinas de Santo Tomas de Aquino (siglo XIV), todav&iacute;a demasiado difundidas, y las de Descartes (siglo XVII), quien aseguraba que "las respuestas de los animales a est&iacute;mulos dolorosos son reflejos. Los animales son aut&oacute;matas que no sienten ni piensan en forma racional y consciente".</font></p>  	    <p align="justify"><font face="verdana" size="2">Dawkins y Wood&#150;Gush<sup>29</sup> definieron el t&eacute;rmino cons&#150;ciencia como un "amplio rango de estados durante los cuales un individuo se da cuenta en forma inmediata de su pensamiento, memoria y sensaci&oacute;n". Griffin<sup>23</sup> lo explica con un ejemplo: "Un animal est&aacute; consciente de que se acerca un predador peligroso".</font></p>  	    <p align="justify"><font face="verdana" size="2">De acuerdo con la definici&oacute;n de Dawkins y Wood&#150;Gush<sup>29</sup> no puede haber duda de que los animales son conscientes de lo que pasa a su alrededor, que tienen memoria y experimentan sensaciones.<sup>29</sup> La pregunta de si piensan, hasta ahora no ha sido resuelta de manera satisfactoria respecto a todas las especies animales.<sup>23</sup> Existen evidencias de que los grandes simios s&iacute; tienen la capacidad de pensar, similar a la de los seres humanos.<sup>30</sup> El problema es que las actitudes de los animales que podr&iacute;an aceptarse como comprobaci&oacute;n de una actividad similar a un pensamiento, se interpretan con una actitud antropoc&eacute;ntrica, es decir, se juzga a partir de la manera de comprender las cosas en el humano, cuando la mente de los animales no es igual a la de los humanos, es similar, pero no igual. Para comprobar esta similitud es necesario estudiar la anatom&iacute;a del sistema nervioso central de los animales, especialmente el enc&eacute;falo. En los vertebrados mam&iacute;feros existen las mismas estructuras cerebrales, con diferencias de tama&ntilde;o, especialmente de la &uacute;ltima capa evolutiva que es la corteza cerebral, que forma gran parte del l&oacute;bulo frontal, la cual es mucho m&aacute;s gruesa en los humanos que en la mayor&iacute;a de los animales, pero no existen diferencias estructurales b&aacute;sicas de los enc&eacute;falos de los vertebrados. Grandin y Johnson<sup>31</sup> refieren que, removiendo la corteza cerebral de los enc&eacute;falos de un ser humano y de un cerdo, a simple vista no se ven diferencias en las estructuras que quedan.</font></p>  	    <p align="justify"><font face="verdana" size="2">Por otra parte, nadie que ha vivido entre y con animales negar&aacute; que tengan memoria. Un caballo que ha sufrido maltrato durante un transporte se reh&uacute;sa a entrar al veh&iacute;culo la pr&oacute;xima vez. Un perro al que no le gusta que lo ba&ntilde;en se esconde en cuanto ve los preparativos. Durante los programas de educaci&oacute;n o entrenamiento, sea para perros, caballos, delfines, animales de circo u otros, algunas veces se usan pr&aacute;cticas que para los animales son desagradables, hasta traum&aacute;ticas, las recuerdan y tratan de evitar el castigo no cometiendo el error.</font></p>  	    <p align="justify"><font face="verdana" size="2">Con los pocos ejemplos que comprueban la existencia de capacidades como memoria y consciencia en los mam&iacute;feros, y probablemente tambi&eacute;n en otros vertebrados, se impone la necesidad de que, para entender a los animales, es necesario conocerlos, saber cu&aacute;les son las necesidades de su comportamiento, &iquest;Qu&eacute; ven? &iquest;Qu&eacute; oyen? &iquest;Qu&eacute; huelen?<sup>32</sup> &iquest;Cu&aacute;l es el efecto de no poder expresar comportamientos biol&oacute;gicamente importantes? &iquest;Cu&aacute;l es la relaci&oacute;n entre comportamiento y salud? &iquest;Cu&aacute;l es la consecuencia sobre su estado de salud cuando tienen que vivir en condiciones en las que se trunca su comportamiento natural? Todo ello es parte de una ciencia relativamente "nueva", la etolog&iacute;a, cuyas fundadores fueron los tres premios Nobel de 1972: Konrad Lorenz, Niko Tinbergen y Karl von Frisch.</font></p>  	    <p align="justify"><font face="verdana" size="2">La etolog&iacute;a se define como el estudio cient&iacute;fico y biol&oacute;gico del comportamiento.<sup>18</sup> Conocer los principios de la etolog&iacute;a, ayuda a deducir si un animal se encuentra en un estado de bienestar o no.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Lorenz<sup>33&#150;34</sup> hizo importantes investigaciones relativas a lobos, perros y aves acu&aacute;ticas, gansos en especial, von Frisch<sup>35</sup> comunic&oacute; estudios fascinantes sobre la vida de las abejas y Tinbergen<sup>36&#150;37</sup> se dedic&oacute; al estudio del comportamiento de diferentes especies y del instinto. Como consecuencia de los trabajos pioneros de los tres cient&iacute;ficos se despert&oacute; el inter&eacute;s en esta nueva rama de la ciencia. Aunque la etolog&iacute;a, o sea el estudio del comportamiento animal, ha hecho progresos considerables para entender qu&eacute; es el bienestar animal y c&oacute;mo deben mantenerse los animales para que vivan con una calidad de vida satisfactoria,<sup>38</sup> en muchos sistemas o formas de aprovechamiento, como los sistemas intensivos, comportamientos importantes desde el punto de vista adaptativo no los pueden expresar, lo que lleva a problemas de bienestar y de salud animal.</font></p>  	    <p align="justify"><font face="verdana" size="2">Se ha escrito m&aacute;s sobre problemas de comportamiento en animales de compa&ntilde;&iacute;a, perros y gatos en especial y en los de laboratorio. Las especies dom&eacute;sticas, que son criadas para la producci&oacute;n de alimentos para los seres humanos, han recibido menos atenci&oacute;n,<sup>19,39,40</sup> raz&oacute;n por la cual se pondr&aacute; m&aacute;s &eacute;nfasis en ellos en este trabajo.</font></p>  	    <p align="justify"><font face="verdana" size="2">Una veterinaria inglesa, Ruth Harrison<sup>41</sup> en su libro <i>Animal Machines,</i> alert&oacute; a comunidades cient&iacute;ficas y a la ciudadan&iacute;a en general, respecto a lo que pasaba en las explotaciones "industriales" dedicadas a criar animales en forma intensiva para consumo. A consecuencia de su libro, la Asociaci&oacute;n de M&eacute;dicos Veterinarios de la Gran Breta&ntilde;a encarg&oacute; a un grupo de expertos, encabezados por el profesor Rogers Brambell un estudio exhaustivo sobre la condici&oacute;n de animales en estas explotaciones. Como resultado, se plantearon consideraciones y recomendaciones resumidas en el informe Brambell,<sup>42</sup> que a su vez gener&oacute; una legislaci&oacute;n del gobierno ingl&eacute;s al respecto.</font></p>  	    <p align="justify"><font face="verdana" size="2">Webster<sup>22</sup> propuso una lista de 5 puntos, que llam&oacute; "Las 5 libertades", y que resumen las necesidades m&iacute;nimas que deben tener todos los animales. Estas 5 libertades son aceptadas hoy en d&iacute;a por la Asociaci&oacute;n Mundial de M&eacute;dicos Veterinarios y de muchas organizaciones nacionales e internacionales. En ellas se establece que los animales deben estar:</font></p>  	 		    <blockquote> 		      <p align="justify"><font face="verdana" size="2"><i>&bull; libres de sed, hambre y mala nutrici&oacute;n,</i> proporcion&aacute;ndoles libre acceso a agua fresca y una dieta que los mantenga en condiciones de salud y vigor.</font></p> 		      <p align="justify"><font face="verdana" size="2"><i>&bull; libres de incomodidades,</i> proporcion&aacute;ndoles un ambiente apropiado, lo que incluye protecci&oacute;n y un &aacute;rea de descanso confortable.</font></p> 		      <p align="justify"><font face="verdana" size="2"><i>&bull; libres de dolor, lesiones y enfermedad,</i> por medio de la prevenci&oacute;n o de un diagn&oacute;stico y tratamiento r&aacute;pidos.</font></p> 		      <p align="justify"><font face="verdana" size="2"><i>&bull; libres para expresar su comportamiento normal,</i> proporcion&aacute;ndoles espacio suficiente, facilidades apropiadas y la compa&ntilde;&iacute;a de animales de su misma especie.</font></p> 		      <p align="justify"><font face="verdana" size="2"><i>&bull; libres de miedo y de "distress"</i> (sufrimiento emocional) asegur&aacute;ndoles condiciones que eviten sufrimiento mental.</font></p> </blockquote> 		    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">En el &aacute;mbito de productores y m&eacute;dico veterinarios zootecnistas dedicados a los animales de abasto, el inter&eacute;s en el comportamiento animal se despert&oacute; cuando se hizo evidente que tanto la calidad como la cantidad del producto que se ofrece al consumidor est&aacute;n estrechamente relacionadas con su bienestar.<sup>43</sup></font></p>     <p align="justify"><font face="verdana" size="2">No es posible abarcar aqu&iacute; todos los factores que preocupan en todas las especies de vertebrados destinados a la producci&oacute;n de alimentos (bovinos, equinos, caprinos, ovinos, conejos, aves, venados entre las m&aacute;s importantes). Por ello s&oacute;lo se describieron algunas condiciones que necesitan una pronta atenci&oacute;n.</font></p>  	    <p align="justify"><font face="verdana" size="2">Los m&eacute;dicos veterinarios que se dedican a los animales de producci&oacute;n saben que muchas de las pr&aacute;cticas de crianza, engorda, transporte y matanza no se realizan con &eacute;tica profesional, en especial de acuerdo con el juramento que se hace a la hora de recibir el t&iacute;tulo universitario de m&eacute;dico veterinario zootecnista, pero tampoco favorecen la calidad del producto que se quiere obtener.</font></p>  	    <p align="justify"><font face="verdana" size="2">En un animal que sufre de estados avanzados de estr&eacute;s, como sucede en aqu&eacute;llos que se sacan de su ambiente acostumbrado, aplicando m&eacute;todos que no toman en cuenta su comportamiento natural, lo que los asusta y les causa miedo, se desencadenan mecanismos endocrinos, uno de los cuales es la movilizaci&oacute;n de gluc&oacute;geno muscular que se transforma en glucosa para hacer frente a las necesidades energ&eacute;ticas inmediatas. Por lo tanto, la carne de estos animales carecer&aacute; de gluc&oacute;geno, que es una de las sustancias importantes para que "madure" bien. A partir del gluc&oacute;geno, y despu&eacute;s de muerto el animal, se forma en la carne acido l&aacute;ctico que baja el pH, inhibiendo as&iacute; el crecimiento de g&eacute;rmenes y prolongando la vida de anaquel. La carne de un animal estresado, con pocas reservas de gluc&oacute;geno, tiene un pH alcalino, es dura y no se conserva bien por la contaminaci&oacute;n bacteriana, y el consumidor la rechazar&aacute;.<sup>44</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Otra importante causa de p&eacute;rdidas para los productores de animales de abasto son las lesiones que se producen en ellos durante los arreos y los transportes. En los rastros donde se lleva a cabo la inspecci&oacute;n de la carne, son frecuentes los decomisos por contusiones, hemorragias o fracturas, a causa de traumatismos que los animales sufren durante el mal manejo en corrales, en el transporte y durante las maniobras de embarque y desembarque. Estos malos manejos tambi&eacute;n demeritan las pieles, fuentes de ingreso para muchas personas.<sup>4548</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Adem&aacute;s de las razones para introducir pr&aacute;cticas de bienestar animal en la producci&oacute;n de los animales de abasto de M&eacute;xico que eviten p&eacute;rdidas al productor, existen otras, de gran inter&eacute;s para la econom&iacute;a nacional y el comercio internacional.</font></p>  	    <p align="justify"><font face="verdana" size="2">Organizaciones nacionales e internacionales, tanto la Uni&oacute;n Europea, la Organizaci&oacute;n Mundial de Comercio (World Trade Organization, WTO) como la Oficina Internacional para la Salud Animal (Office International des &Eacute;pizooties, (OIE),<sup>49</sup> y la Food and Agricultural Organization (FAO)<sup>50</sup> han incluido el bienestar animal en su mandato. Los pa&iacute;ses miembros de la OIE han considerado que el v&iacute;nculo entre la salud de los animales y su bienestar era tan obvio que la OIE deb&iacute;a convertirse en referencia internacional en materia de protecci&oacute;n de los animales.<sup>50&#150;55</sup> LA OIE ha propuesto gu&iacute;as en el &aacute;rea de bienestar animal, para que sean adoptadas por su comit&eacute; internacional. Estas gu&iacute;as ser&aacute;n de importancia para los pa&iacute;ses que desean tener relaciones comerciales con pa&iacute;ses miembros de la OIE. Finalmente, ser&aacute;n un apoyo importante para aquellos pa&iacute;ses que todav&iacute;a no cuentan con legislaci&oacute;n al respecto, pero que piensan introducirla.<sup>52,54,55</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">En cuanto a la pregunta formulada al inicio del art&iacute;culo &iquest;debe incluirse el bienestar animal en los planes de estudio de escuelas y facultades de Medicina Veterinaria y Zootecnia?</font></p>  	    <p align="justify"><font face="verdana" size="2">Si se acepta que el bienestar animal actualmente es una ciencia,<sup>26,40,56&#150;60</sup> y no puede haber duda al respecto, la respuesta indudablemente es s&iacute;. Evidentemente el m&eacute;dico veterinario zootecnista es la persona indicada para ocupar el liderazgo en la materia, por lo que tiene que conocerla a fondo.<sup>61</sup> El problema ha sido que en los planes de estudio de la mayor&iacute;a de las universidades mexicanas no se incluyen ni etolog&iacute;a, ni bienestar animal, ni bio&eacute;tica; cito las tres materias porque tienen estrecha relaci&oacute;n.</font></p>  	    <p align="justify"><font face="verdana" size="2">Para las escuelas y facultades de Medicina Veterinaria y Zootecnia ser&aacute; un reto incluir Bienestar animal en el plan de estudios, porque, como se ha dicho, requiere de otros conocimientos, adem&aacute;s de los que se adquieren rutinariamente durante los a&ntilde;os de estudio, que no se ense&ntilde;an con la profundidad necesaria en las instituciones del pa&iacute;s. Para citar algunos ejemplos: las instalaciones en los ranchos (mangas de manejo, embarcaderos), en centros de producci&oacute;n intensiva (cerdos, gallinas de postura, pollos de engorda, becerros, conejos, criaderos de animales para peleter&iacute;a), en mercados y tianguis, en rastros, m&eacute;todos de matanza humanitaria, veh&iacute;culos de transporte y el manejo de los animales en general. &Eacute;stos y muchos m&aacute;s son temas que en el curr&iacute;culum de las instituciones de ense&ntilde;anza de medicina veterinaria o bien no figuran, o se mencionan de un modo superficial, de acuerdo con la opini&oacute;n de algunos profesores de materias afines, como la de producci&oacute;n animal.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Se ha discutido mucho si la materia de Bienestar animal debe ense&ntilde;arse como curso formal o debe integrarse a otras que pueden tener relaci&oacute;n con la materia. No cabe duda que un curso formal es preferible. Si se incluye en materias relacionadas se debe tener la certeza, en primer lugar, de que el maestro respectivo est&eacute; convencido de la importancia de este conocimiento, y en segundo, que lo ense&ntilde;e bien, es decir, acorde con los lineamentos generales establecidos por los especialistas y las autoridades del plantel. Si ello no se logra, se transmitir&aacute;n mensajes contradictorios a los alumnos, lo que crear&aacute; confusi&oacute;n y no se podr&aacute;n lograr los objetivos.</font></p>  	    <p align="justify"><font face="verdana" size="2">En otros pa&iacute;ses, existen algunas universidades en las que se ense&ntilde;a la materia,<sup>8,56,62&#150;71</sup> entre las cuales ocupan las de Australia y Nueva Zelanda una posici&oacute;n de liderazgo.<sup>56,72&#150;74</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Conclusiones</b></font></p>  	    <p align="justify"><font face="verdana" size="2">En respuesta a las preguntas iniciales, se concluye que:</font></p>  	    <p align="justify"><font face="verdana" size="2"><b><i>&iquest;Por qu&eacute;?</i></b></font></p>  	    <p align="justify"><font face="verdana" size="2">Existen bases cient&iacute;ficas para asegurar que los animales son seres conscientes, que sienten dolor, ansiedad, miedo, fatiga, frustraciones, emociones como alegr&iacute;a, aburrimiento, depresi&oacute;n y otros estados emocionales o mentales que pueden causar sufrimiento; adem&aacute;s de que se dan cuenta de su entorno y son capaces de sufrir.</font></p>  	    <p align="justify"><font face="verdana" size="2">Estos conocimientos obligan a ofrecerles condiciones de vida acordes con las necesidades para su bienestar (las 5 libertades de Webster) y acordes con el Juramento Profesional de todo m&eacute;dico veterinario zootecnista.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b><i>&iquest;Para qu&eacute;?</i></b></font></p>  	    <p align="justify"><font face="verdana" size="2">Para mejorar la calidad de vida de los animales.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Adem&aacute;s es necesario contar con instalaciones adecuadas para facilitar a las personas involucradas el manejo tranquilo de los animales y para propiciar su comportamiento natural, evitando lesiones por golpes, ca&iacute;das, y deterioro en la calidad de la carne y de las pieles. De esta manera, se evitar&aacute;n p&eacute;rdidas durante el proceso de producci&oacute;n (rancho, embarque, desembarque, transporte, matanza, calidad), y se aumentar&aacute;n las ganancias de los productores, lo cual permitir&aacute; estar a la altura de la legislaci&oacute;n internacional al respecto y participar en el comercio internacional.</font></p>  	    <p align="justify"><font face="verdana" size="2">Todo ello confirma la necesidad de incluir los temas de bienestar animal en el plan de estudios de la carrera de Medicina Veterinaria y Zootecnia bajo la premisa de que los animales no son "cosas", que tienen una estructura org&aacute;nica, muy especialmente la del sistema nervioso central, muy similar a la de los seres humanos, y que ello obliga a considerarlos seres vivientes conscientes de su entorno y capaces de sufrir, por lo que es necesario conocer sus reacciones y entenderlas por medio del estudio de la ciencia del Bienestar animal y de la etolog&iacute;a en general.</font></p>  	    <p align="justify"><font face="verdana" size="2">Por otra parte, en cuanto a la producci&oacute;n de alimentos de origen animal, la profesi&oacute;n veterinaria ha aceptado el reto de ser la responsable de la producci&oacute;n de animales de abasto y sabiendo que &eacute;sta ser&aacute; optima cuando los animales vivan con buenos niveles de bienestar, es indispensable que sus miembros conozcan el tema y que los estudiantes lo aprendan durante los a&ntilde;os de su carrera.</font></p>  	    <p align="justify"><font face="verdana" size="2">Los principios del bienestar animal deben ser aplicados a todos los animales, no importando su fin zoot&eacute;cnico.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Agradecimientos</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Se agradece al Dr. Francisco Galindo, la revisi&oacute;n cr&iacute;tica del documento y a la Sra. Isabel Aguilar su paciente ayuda durante su elaboraci&oacute;n.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. ROLLIN B. Farm Animal Welfare Social, bioethical and research issues. Ames: Iowa State University Press, 1995.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=10173744&pid=S0301-5092201100020000400001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">2. DEGRAZIA D. Taking Animals Seriously Mental Life and Moral Status. 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