<?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>0122-0268</journal-id>
<journal-title><![CDATA[Revista MVZ Córdoba]]></journal-title>
<abbrev-journal-title><![CDATA[Rev.MVZ Cordoba]]></abbrev-journal-title>
<issn>0122-0268</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Córdoba - Facultad de Medicina Veterinaria y Zootecnia.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0122-02682010000200002</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Florfenicol concentrations in milk of lactating cows postreated by intramuscular or intramammary routes]]></article-title>
<article-title xml:lang="es"><![CDATA[Concentraciones de florfenicol en leche de vacas en lactancia postratamiento por vía intramuscular o intramamaria]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz B]]></surname>
<given-names><![CDATA[John]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zapata N]]></surname>
<given-names><![CDATA[Mauren]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López C]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gutiérrez H]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Antioquia Facultad de Ciencias Agrarias Grupo de investigación Centauro]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad CES Facultad de Medicina Veterinaria y Zootecnia ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad de Antioquia Facultad de Ciencias Exactas y Naturales Grupo Interdisciplinario en Análisis de Residuos (GIAR)]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>05</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>05</month>
<year>2010</year>
</pub-date>
<volume>15</volume>
<numero>2</numero>
<fpage>2041</fpage>
<lpage>2050</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0122-02682010000200002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0122-02682010000200002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0122-02682010000200002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Objective. To determine the florfenicol concentration in bovine milk after intramuscular or intramammary administration to establish the optimum withdrawal time, therapeutic efficacy, and its influence on milk yield. Materials and method. Twelve healthy lactating Holstein cows were selected from the University of Antioquia's teaching dairy herd (Colombia), were randomly assigned to a control (n=6) group or florfenicol (n=6) group that received 20 mg/kg of florfenicol by intramammary and intramuscular routes, with a 15 days washout period between treatments. Results. The Tmax and Cmax for the intramuscular route were 6 hours and 2.86 mg/L respectively. The Tmax and Cmax for the intramammary route, were estimated at 0 hour and about 20000 mg/L respectively by extrapolated from regression line. The florfenicol elimination phase in milk had an average half-life of elimination (t1/2) of 19.8 hours and 4.9 hours for intramuscular and intramammary administration, respectively. The therapeutic efficacy only was reached by intramammary route, when minimal inhibitory concentration (M.I.C.) of florfenicol by Stahphylococcus aureus, was used as reference value. There was no statistically significant difference in milk yield between treated and non-treated cows. Conclusions. According to these results, post-treatment milk withdrawal should be no less than 3 days for intramammary administration, and at least 7 days for intramuscular administration. The therapeutic efficacy only was reached by intramammary route. In addition, there was no statistically significant difference in milk yield between treated and non-treated cows.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Objetivo. Determinar la concentración de florfenicol en leche bovina después del tratamiento intramuscular o intramamario, para establecer el tiempo de retiro, la eficacia terapéutica, y su influencia sobre la producción láctea. Materiales y métodos. Se seleccionaron doce vacas Holstein en lactancia de la hacienda de Universidad de Antioquia (Colombia). Se asignaron al azar al grupo control (n=6) o al grupo florfenicol (n=6), al cual se le administró 20 mg/kg de florfenicol por vía intramamaria e intramuscular con 15 días de diferencia entre tratamientos. Resultados. La Tmax y Cmax para la vía intramuscular fueron 6 horas y 2.86 mg/L respectivamente. La Tmax y Cmax para la vía intramamaria, fueron estimados como 0 hora y aproximadamente 20000 mg/L respectivamente por extrapolación de la línea de regresión. La fase de eliminación del florfenicol en leche, tuvo una vida media de eliminación (t1/2) promedio de 19.8 horas y 4.9 horas para la vía intramuscular e intramamaria respectivamente. Cuando la concentración inhibitoria minima (C.I.M) del florfenicol para Stahphylococcus aureus, fue usada como el valor de referencia, la eficacia terapéutica sólo se alcanzó por la vía intramamaria. No existió diferencia estadística significativa entre las producciones lácteas de las vacas tratadas y no tratadas. Conclusiones. De acuerdo con estos resultados, el tiempo de retiro postratamiento no debe ser menor de 3 días para la administración intramamaria y al menos 7 días para la administración intramuscular. La eficacia terapéutica sólo se alcanzó por la vía intramamaria. Además no existió diferencia estadística significativa en la producción láctea de las vacas tratadas con respecto a las no tratadas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Pharmacokinetics]]></kwd>
<kwd lng="en"><![CDATA[residues]]></kwd>
<kwd lng="en"><![CDATA[tolerance]]></kwd>
<kwd lng="en"><![CDATA[cows]]></kwd>
<kwd lng="en"><![CDATA[florfenicol]]></kwd>
<kwd lng="es"><![CDATA[Farmacocinética]]></kwd>
<kwd lng="es"><![CDATA[residuos]]></kwd>
<kwd lng="es"><![CDATA[tolerancia]]></kwd>
<kwd lng="es"><![CDATA[vacas]]></kwd>
<kwd lng="es"><![CDATA[florfenicol]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  ]]></body><back>
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