<?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>0253-570X</journal-id>
<journal-title><![CDATA[Revista de Salud Animal]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Salud Anim.]]></abbrev-journal-title>
<issn>0253-570X</issn>
<publisher>
<publisher-name><![CDATA[Centro Nacional de Sanidad Agropecuaria]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0253-570X2008000100007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[SEPARACION DE ESPERMATOZOIDES "Y" DE EYACULADO DE CONEJO POR MEDIO DE GRADIENTES DE DENSIDAD DE ALBÚMINA SÉRICA HUMANA]]></article-title>
<article-title xml:lang="en"><![CDATA[SEPARATION OF "Y" SPERMATOZOA IN RABBIT SEMEN BY DIFFERENT DENSITY GRADIENTS OF HUMAN SERUM ALBUMIN]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández]]></surname>
<given-names><![CDATA[P.J.E]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández]]></surname>
<given-names><![CDATA[R.F]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reyes]]></surname>
<given-names><![CDATA[C.J]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cerezo]]></surname>
<given-names><![CDATA[P.G]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Echegaray]]></surname>
<given-names><![CDATA[J.L]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mendoza]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Autónoma metropolitana-Xochimilco  ]]></institution>
<addr-line><![CDATA[ D.F]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Clínica Privada  ]]></institution>
<addr-line><![CDATA[ D.F]]></addr-line>
<country>México</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Centro Internacional de Reproducción Asistida  ]]></institution>
<addr-line><![CDATA[ D.F]]></addr-line>
<country>México</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Universidad Autónoma Chapingo (UACh) Unidad de Investigación Aplicada en Producción Cunícola (UIAPC) ]]></institution>
<addr-line><![CDATA[ Estado de México]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2008</year>
</pub-date>
<volume>30</volume>
<numero>1</numero>
<fpage>45</fpage>
<lpage>49</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0253-570X2008000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0253-570X2008000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0253-570X2008000100007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se obtuvieron 33 eyaculados de conejos Nueva Zelanda blancos para realizar la separación de espermatozoides "Y" por medio de diferentes gradientes de densidad (10, 15 y 20%) de Albúmina Sérica Humana (HSA). Las características evaluadas en fresco fueron: volumen, porcentaje de motilidad progresiva, espermatozoides vivos, morfología normal y concentración, siendo los valores de: 1.19 mL, 82.72%, 90.90%, 89.96% y 773.63X10(6), respectivamente. El semen fue diluido 1:1 en un medio de citrato de sodio y glucosa, para posteriormente colocarlo en tubos que contenían gradientes de concentraciones de albúmina al 20%, 15% y 10%, colocándose a una temperatura de 37.5°C. Una vez realizado lo anterior se retiró cada una de las fracciones con intervalo de 10 minutos, determinando en cada fracción el porcentaje de motilidad, espermatozoides vivos y concentración espermática. Se observó una disminución importante de la motilidad del semen fresco (82.72%) en comparación a la motilidad progresiva de la capa de HSA al 20% que fue de 35.45%. Conforme los espermatozoides alcanzan las capas de mayor densidad el porcentaje de vivos disminuye siendo de 88.39, 86.21 y 83.06% para el 10, 15 y 20% de HSA respectivamente, observándose lo mismo con relación a la concentración espermática (504.24, 376.06 y 211.81X10(6)/ml). De un total de 30 partos después de la inseminación artificial con espermatozoides obtenidos de la capa con 20% de HSA, nacieron 187 gazapos siendo el 72.72% machos y 27.27% hembras. Los resultados indican que mediante gradientes de densidad de HSA es posible realizar la selección de espermatozoides "Y" en semen de conejo y consecuentemente producir más machos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Thirty-three ejaculations of white New Zealand rabbits were obtained to perform the separation of "Y" spermatozoa by different density gradients (10, 15 and 20%) of Human Serum Albumin (HSA). The characteristics evaluated in fresh semen were: volume, progressive motility percentage, live spermatozoa, normal morphology and concentration, being these values: 1.19 ml, 82.72%, 90.90%, 89.96% and 773.63X10(8) respectively. Semen was diluted 1:1 in a medium of sodium citrate and glucose; then, 1ml of diluted semen was added in tubes containing gradients of albumin at 20%, 15% and 10%, at a temperature of 37.5ºC. Latter, each of the factions was retired within intervals of 10 minutes each, determining motility percentage, live spermatozoa and spermatic concentration in each fraction. An important decrease of fresh semen motility was observed (82.72%) compared to the progressive motility in the HSA layer at 20%, which was 35.45%. As spermatozoa reach the layers of higher density, the percentage of the live ones decreases being 88.39, 86.21 and 83.06 for the 10, 15 and 20% of HAS respectively, observing the same related to spermatic concentration (504.24, 376.06 and 211.81X10(6)/ml). From 30 births after artificial insemination with spermatozoa obtained from the layer with 20% of HSA, 187 rabbits were born being the 72.72% males and 27.27 females. The results indicate that it is possible to perform the selection of "Y" spermatozoa in rabbit semen and consequently produce more males, by the use of density gradients of HSA.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[separación de espermatozoides]]></kwd>
<kwd lng="es"><![CDATA[Albúmina Sérica Humana]]></kwd>
<kwd lng="es"><![CDATA[conejo]]></kwd>
<kwd lng="en"><![CDATA[spermatozoa separation]]></kwd>
<kwd lng="en"><![CDATA[Human Serum Albumin]]></kwd>
<kwd lng="en"><![CDATA[rabbit]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <div align="right">       <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Art&iacute;culo      rese&ntilde;a</b></font></p>       <p>&nbsp;</p>       <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">    <BR>     <b><font size="4">SEPARACION DE ESPERMATOZOIDES &quot;Y&quot; DE EYACULADO      DE CONEJO POR MEDIO DE GRADIENTES DE DENSIDAD DE ALB&Uacute;MINA S&Eacute;RICA      HUMANA</font></b> </font></p>       <p align="left">&nbsp; </p> </div>     <P align="left"> <font face="Verdana, Arial, Helvetica, sans-serif" size="3"><b>SEPARATION    OF &quot;Y&quot; SPERMATOZOA IN RABBIT SEMEN BY DIFFERENT DENSITY GRADIENTS    OF HUMAN SERUM ALBUMIN</b></font>     <P align="left">&nbsp;     <P align="left">&nbsp;     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>P.J.E. Hern&aacute;ndez*,    R.F. Fern&aacute;ndez*, C.J. Reyes**, P.G. Cerezo***, J.L. Echegaray**** y B.    Mendoza****</b></font>     ]]></body>
<body><![CDATA[<P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><i>*Laboratorio    &quot;Manejo de la Reproducci&oacute;n&quot;. Universidad Aut&oacute;noma metropolitana-Xochimilco.    Calzada del Hueso 1100, Colonia Villa Quietud, Coyoac&aacute;n 04960. M&eacute;xico,    D.F.; **Cl&iacute;nica Privada. M&eacute;xico, D.F.; ***REPROMEDICA S.A DE C.V.    Centro Internacional de Reproducci&oacute;n Asistida. M&eacute;xico, D.F.; ****Unidad    de Investigaci&oacute;n Aplicada en Producci&oacute;n Cun&iacute;cola (UIAPC),    de la Universidad Aut&oacute;noma Chapingo (UACh), Texcoco, Estado de M&eacute;xico    </i></font>     <P>&nbsp;     <P>&nbsp; <hr noshade size="1">     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>RESUMEN</b></font>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Se obtuvieron 33    eyaculados de conejos Nueva Zelanda blancos para realizar la separaci&oacute;n    de espermatozoides &quot;Y&quot; por medio de diferentes gradientes de densidad    (10, 15 y 20%) de Alb&uacute;mina S&eacute;rica Humana (HSA). Las caracter&iacute;sticas    evaluadas en fresco fueron: volumen, porcentaje de motilidad progresiva, espermatozoides    vivos, morfolog&iacute;a normal y concentraci&oacute;n, siendo los valores de:    1.19 mL, 82.72%, 90.90%, 89.96% y 773.63X10<SUP>6</SUP>, respectivamente. El    semen fue diluido 1:1 en un medio de citrato de sodio y glucosa, para posteriormente    colocarlo en tubos que conten&iacute;an gradientes de concentraciones de alb&uacute;mina    al 20%, 15% y 10%, coloc&aacute;ndose a una temperatura de 37.5&#176;C. Una    vez realizado lo anterior se retir&oacute; cada una de las fracciones con intervalo    de 10 minutos, determinando en cada fracci&oacute;n el porcentaje de motilidad,    espermatozoides vivos y concentraci&oacute;n esperm&aacute;tica. Se observ&oacute;    una disminuci&oacute;n importante de la motilidad del semen fresco (82.72%)    en comparaci&oacute;n a la motilidad progresiva de la capa de HSA al 20% que    fue de 35.45%. Conforme los espermatozoides alcanzan las capas de mayor densidad    el porcentaje de vivos disminuye siendo de 88.39, 86.21 y 83.06% para el 10,    15 y 20% de HSA respectivamente, observ&aacute;ndose lo mismo con relaci&oacute;n    a la concentraci&oacute;n esperm&aacute;tica (504.24, 376.06 y 211.81X10<SUP>6</SUP>/ml).    De un total de 30 partos despu&eacute;s de la inseminaci&oacute;n artificial    con espermatozoides obtenidos de la capa con 20% de HSA, nacieron 187 gazapos    siendo el 72.72% machos y 27.27% hembras. Los resultados indican que mediante    gradientes de densidad de HSA es posible realizar la selecci&oacute;n de espermatozoides    &quot;Y&quot; en semen de conejo y consecuentemente producir m&aacute;s machos.    </font>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Palabras clave:</b>    separaci&oacute;n de espermatozoides; Alb&uacute;mina S&eacute;rica Humana;    conejo</font> <hr noshade size="1">     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>ABSTRACT</b></font>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Thirty-three ejaculations    of white New Zealand rabbits were obtained to perform the separation of &quot;Y&quot;    spermatozoa by different density gradients (10, 15 and 20%) of Human Serum Albumin    (HSA). The characteristics evaluated in fresh semen were: volume, progressive    motility percentage, live spermatozoa, normal morphology and concentration,    being these values: 1.19 ml, 82.72%, 90.90%, 89.96% and 773.63X10<SUP>8</SUP>    respectively. Semen was diluted 1:1 in a medium of sodium citrate and glucose;    then, 1ml of diluted semen was added in tubes containing gradients of albumin    at 20%, 15% and 10%, at a temperature of 37.5<SUP>o</SUP>C. Latter, each of    the factions was retired within intervals of 10 minutes each, determining motility    percentage, live spermatozoa and spermatic concentration in each fraction. An    important decrease of fresh semen motility was observed (82.72%) compared to    the progressive motility in the HSA layer at 20%, which was 35.45%. As spermatozoa    reach the layers of higher density, the percentage of the live ones decreases    being 88.39, 86.21 and 83.06 for the 10, 15 and 20% of HAS respectively, observing    the same related to spermatic concentration (504.24, 376.06 and 211.81X10<SUP>6</SUP>/ml).    From 30 births after artificial insemination with spermatozoa obtained from    the layer with 20% of HSA, 187 rabbits were born being the 72.72% males and    27.27 females. The results indicate that it is possible to perform the selection    of &quot;Y&quot; spermatozoa in rabbit semen and consequently produce more males,    by the use of density gradients of HSA.</font>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Key words:</b>    spermatozoa separation; Human Serum Albumin; rabbit </font> <hr noshade size="1">     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Texto completo    en formato PDF    ]]></body>
<body><![CDATA[<BR>       <BR>   </font>      ]]></body><back>
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