<?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>0122-9354</journal-id>
<journal-title><![CDATA[Revista de Medicina Veterinaria]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Med. Vet.]]></abbrev-journal-title>
<issn>0122-9354</issn>
<publisher>
<publisher-name><![CDATA[Universidad de La Salle]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0122-93542017000300149</article-id>
<article-id pub-id-type="doi">10.19052/mv.4397</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efecto del isoespintanol y el timol en la actividad antioxidante de semen equino diluido con fines de congelación]]></article-title>
<article-title xml:lang="en"><![CDATA[Effect of isoespintanol and thymol on the antioxidant activity of equine semen diluted for freezing purposes]]></article-title>
<article-title xml:lang="pt"><![CDATA[Efeito do isoespintanol e o timol na atividade antioxidante de sêmen equino diluído para fins de congelação]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Restrepo Betancur]]></surname>
<given-names><![CDATA[Giovanni]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojano]]></surname>
<given-names><![CDATA[Benjamín Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Colombia Facultad de Ciencias Agrarias Departamento de Producción Animal]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional de Colombia Facultad de Ciencias Escuela de Química]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>07</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>07</month>
<year>2017</year>
</pub-date>
<numero>35</numero>
<fpage>149</fpage>
<lpage>158</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0122-93542017000300149&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0122-93542017000300149&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0122-93542017000300149&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Una amplia variedad de antioxidantes evaluados en la congelación de semen equino no ha arrojado resultados satisfactorios en el mantenimiento de su calidad y fertilidad. El isoespintanol y el timol son moléculas de origen natural con una alta actividad antioxidante, lo que las hace potencialmente útiles para reducir el estrés oxidativo del semen durante la criopreservación. Este estudio tuvo como objetivo evaluar el efecto del isoespintanol y el timol en la actividad antioxidante total y enzimática de semen equino diluido con fines de congelación. El semen de cinco caballos criollos colombianos se diluyó en un medio de congelación, se dividió en tres alícuotas que se asignaron aleatoriamente a los tratamientos isoespintanol (40 µM), timol (50 µM) o control (sin antioxidante). Se evaluó la capacidad antioxidante total (TAC) por los ensayos ORAC y FRAP. La actividad de catalasa (CAT), superóxido dismutasa (SOD) y glutatión peroxidasa (GPx) se evaluaron mediante pruebas enzimáticas. La evaluación estadística se realizó mediante modelos mixtos, análisis de correlación y comparación de medias por la prueba de Tukey. Las actividades de SOD y GPx fueron menores para el isoespintanol (6,7 ± 2,2 U/ ml y 0,16 ± 0,02 U/ml), comparadas con el timol (6,9 ± 2,2 U/ml y 0,20 ± 0,02 U/ml) y el control (7,2 ± 2,2 U/ml y 0,22 ± 0,02 U/ml) (p &lt; 0,05). No hubo diferencias para la TAC o la CAT del semen (p &gt; 0,05). El isoespintanol reduce la actividad de SOD y GPx en el semen equino diluido con fines de congelación.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract A wide variety of antioxidants that were evaluated for freezing equine semen failed to yield satisfactory results in maintaining their quality and fertility. Isoespintanol and thymol are molecules of natural origin with a high antioxidant activity, which makes them potentially useful for reducing semen oxidative stress during cryopreservation. This study aimed to evaluate the effect of isoespintanol and thymol on total antioxidant and enzymatic activity of equine semen diluted for freezing purposes. The semen of five Colombian creole horses was diluted in a freezing medium, divided into three aliquots that were randomly assigned to treatments with isoespintanol (40 µM), thymol (50 µM), or control (no antioxidant). Total antioxidant capacity (TAC) was evaluated using ORAC and FRAP tests. Catalase (CAT), superoxide dismutase (SOD) and glutathione peroxidase (GPx) activity were evaluated by enzymatic assays. The statistical evaluation was performed using mixed models, correlation analysis, and comparison of means by Tukey's test. SOD and GPx activities were lower for isoespintanol (6.7 ± 2.2 U/ml and 0.16 ± 0.02 U/ml), compared to thymol (6.9 ± 2.2 U/ml and 0.20 ± 0.02 U/ml) and to control (7.2 ± 2.2 U/ml and 0.22 ± 0.02 U/ml) (p &lt; 0.05). There were no differences for TAC or CAT in semen (p &gt; 0.05). Isoespintanol reduces SOD and GPx activity in equine semen diluted for freezing purposes.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo Uma ampla variedade de antioxidantes avaliados na congelação de sêmen equino não tem mostrado resultados satisfatórios na manutenção de sua qualidade e fertilidade. O isoespintanol e o timol são moléculas de origem natural com uma alta atividade antioxidante, fator que as faz potencialmente úteis para reduzir o estresse oxidativo do sêmen durante a criopreservação. Este estudo teve como objetivo avaliar o efeito do isoespintanol e do timol na atividade antioxidante total e enzimática de sêmen equino diluído para fins de congelação. O sêmen de cinco cavalos nativos da Colômbia foi diluído em um meio de congelação, depois dividido em três partes designadas aleatoriamente aos tratamentos isoespintanol (40 µM), timol (50 µM) o controle (sem antioxidante). Avaliou-se a capacidade antioxidante total (TAC) pelos ensaios ORAC e FRAP. A atividade de catalase, superóxido dismutase (SOD) e glutationa peroxidase (GPx) se avaliaram mediante provas enzimáticas. A avaliação estatística realizou-se mediante modelos mistos, análise de correlação e comparação de médias pela prova de Tukey. As atividades de SOD e GPx foram menores para o isoespintanol (6,7 ± 2,2 U/ml e 0,16 ± 0,02 U/ml), comparadas com o timol (6,9 ± 2,2 U/ml e 0,20 ± 0,02 U/ml) e o controle (7,2 ± 2,2 U/ ml e 0,22 ± 0,02 U/ml) (p &lt; 0,05). Não houve diferenças para a TAC ou a CAT do sêmen (p &gt; 0.05). O isoespintanol reduz a atividade de SOD e GPx no sêmen equino diluído para fins de congelação.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[antioxidantes]]></kwd>
<kwd lng="es"><![CDATA[criopreservación]]></kwd>
<kwd lng="es"><![CDATA[enzimas.]]></kwd>
<kwd lng="en"><![CDATA[antioxidants]]></kwd>
<kwd lng="en"><![CDATA[cryopreservation]]></kwd>
<kwd lng="en"><![CDATA[enzymes]]></kwd>
<kwd lng="pt"><![CDATA[antioxidantes]]></kwd>
<kwd lng="pt"><![CDATA[criopreservação]]></kwd>
<kwd lng="pt"><![CDATA[enzimas]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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