<?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>0120-0690</journal-id>
<journal-title><![CDATA[Revista Colombiana de Ciencias Pecuarias]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Colom Cienc Pecua]]></abbrev-journal-title>
<issn>0120-0690</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Ciencias Agrarias, Universidad de Antioquia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-06902017000100048</article-id>
<article-id pub-id-type="doi">10.17533/udea.rccp.v30n1a06</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Factors associated with Mycobacterium avium subsp. paratuberculosis in dairy cows from Northern Antioquia, Colombia]]></article-title>
<article-title xml:lang="es"><![CDATA[Factores asociados con el estatus serológico de Mycobacterium avium subsp. paratuberculosis en vacas lecheras del norte de Antioquia, Colombia]]></article-title>
<article-title xml:lang="pt"><![CDATA[Fatores associados ao estado sorológico de Mycobacterium avium subsp. paratuberculosis em soro de gado leiteira no norte de Antioquia, Colombia]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández Silva]]></surname>
<given-names><![CDATA[Jorge A]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez Vásquez]]></surname>
<given-names><![CDATA[Nicolás F]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Correa Valencia]]></surname>
<given-names><![CDATA[Nathalia M]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Antioquia Facultad de Ciencias Agrarias Escuela de Medicina Veterinaria]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Antioquia Facultad de Ciencias Agrarias Escuela de Medicina Veterinaria]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2017</year>
</pub-date>
<volume>30</volume>
<numero>1</numero>
<fpage>48</fpage>
<lpage>59</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-06902017000100048&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-06902017000100048&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-06902017000100048&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary  Background:  Johne´s disease (JD) is a severe enteritis that affects ruminants and has been diagnosed in cattle and sheep in Colombia. However, epidemiological information on the disease in this country is scarce.  Objective:  to identify factors associated with the JD serum enzyme-linked immunosorbent assay (ELISA) status of dairy cows.  Methods:  a cross-sectional study was carried out in 307 asymptomatic adult Holstein dairy cows from 14 herds in nine districts of Belmira and San Pedro de los Milagros municipalities during November, 2007. From 19 to 25 cows, &#8805; 2 years of age were randomly selected and blood sampled from every herd. A commercial ELISA kit was used to analyze sera. Information regarding cow related factors (age, farm-born, parity, and daily milk yield) and herd management practices (i.e. herd size, herd average milk production, current presence of symptomatic animals, cattle purchase, own animals grazing in foreign pastures, feeding of calves before weaning, manure spread on pastures, and sighting of birds in feed storing areas) was collected using questionnaires. Descriptive statistics were computed for all variables and a multivariable logistic regression model was constructed (p&lt;0.05).  Results:  ten percent (31/307; 95% CI: 7.0-14.0%) of the animals were positive by ELISA. In 70% (10/14) of the herds, ELISA detected at least one positive animal. Cow and herd factors &#8220;parity&#8221; and &#8220;feeding of calves before weaning&#8221; showed weak and strong associations with ELISA positive results, respectively. The odds ratio (OR) for JD seropositivity increased 20% (OR = 1.20; 95% CI: 0.98-1.47; p = 0.067) in cows with &gt; 1 parity. The OR was 0.74 times lower (OR = 0.26; 95% CI: 0.096-0.70; p&lt;0.01) in herds feeding calves with pooled colostrum from several cows, compared to herds feeding calves with colostrum from their own dams.  Conclusion:  JD seroprevalence was 10 and 70% at animal and herd-level, respectively. Cow and herd factors &#8220;parity&#8221; and &#8220;feeding of calves before weaning&#8221; showed weak and strong association with positive results, respectively.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes: la enfermedad de Johne (EJ) es una enteritis severa que afecta rumiantes, y ha sido diagnosticada en bovinos y ovejas en Colombia. Sin embargo, la información epidemiológica de la enfermedad en el país es escaza.  Objetivo:  identificar los factores asociados con el estatus serológico de la EJ mediante ensayo de inmunoabsorción ligado a enzimas (ELISA) en vacas lecheras.  Métodos:  se realizó un estudio transversal en 307 vacas lecheras adultas asintomáticas de 14 hatos en 9 veredas en los municipios de Belmira y San Pedro de los Milagros, en noviembre de 2007. De cada hato se seleccionaron aleatoriamente 19-25 vacas, mayores de 2 años de edad y se tomaron muestras de sangre. Se utilizó un kit comercial de ELISA para analizar el suero. Se recolectó información mediante cuestionarios sobre características individuales de las vacas y prácticas de manejo de los hatos. Se realizó un estudio estadístico descriptivo para todas las variables de interés y se construyó un modelo de regresión logística multivariada, considerando un nivel de significancia de p&lt;0,05.  Resultados:  el 10% de los animales fue positivo a ELISA (31/307; 95% CI: 7,0-14%). En el 70% (10/14) de los hatos al menos un animal fue detectado como positivo por ELISA. Los factores a nivel individual y a nivel hato &#8220;número de partos&#8221; y &#8220;tipo de alimentación de terneras antes del destete&#8221; mostraron una asociación débil y fuerte con los resultados positivos de ELISA, respectivamente. El odds ratio (OR) para la seropositividad a EJ aumentó en un 20% (OR = 1,20; 95% CI: 0,98-1,47; p = 0,067) en vacas con más de un parto, mientras que fue 0,74 veces menor (OR = 0,26; 95% CI: 0,096-0,70; p&lt;0,01) en hatos que alimentan sus terneras con mezcla de calostro proveniente de varias vacas, en comparación con aquellos hatos que solo utilizan el calostro de la propia madre.  Conclusión:  la seroprevalencia de EJ fue del 10 y del 70% a nivel individual y a nivel hato, respectivamente. Los factores a nivel individual y a nivel hato &#8220;número de partos&#8221; y &#8220;tipo de alimentación de terneras antes del destete&#8221; mostraron una asociación débil y fuerte con los resultados positivos de ELISA, respectivamente.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo  Antecedentes: a doença de Johne (DJ) é uma enterite grave que afeta o ruminantes, e tem sido diagnosticada em bovinos e ovinos na Colômbia. No entanto, a informação epidemiológica da doença no país é escassa.  Objetivo:  identificar os fatores associados ao estado sorológico de DJ em vacas leiteiras por ensaio imunossorvente ligado a enzima (ELISA).  Métodos:  estudo transversal foi realizado em 307 vacas leiteiras adultos assintomáticos em 9 de 14 aldeias nos municípios de Belmira y San Pedro de los Milagros, em novembro de 2007. Em cada rebanho foram selecionados aleatoriamente 19-25 vacas com mais de 2 anos de idade e amostras de sangue foram tomadas. Um kit de ELISA comercial é utilizado para testar soros. As informações foram coletadas por meio de questionários sobre as características individuais de animais e práticas de gestão do rebanho. A análise estatística descritiva foi realizada para todas as variáveis de interesse e modelo de regressão logística multivariada foi construído, considerando um nível de significância de p&lt;0,05.  Resultados:  dez por cento dos animais foram positivos no ELISA (31/307; 95% CI: 7,0-14%). No 70% (10/14) os rebanhos pelo menos, um animal foi detectado como positivo por ELISA. Os fatores a nível individual como a nível do rebanho "paridade" e "tipo de alimentação bezerros antes do desmame" mostraram uma associação fraca e forte com os resultados positivos de ELISA, respectivamente. O odds ratio (OR) para DJ soropositividade aumentou em um 20% (OR = 1,20; 95% CI: 0,98-1,47; p = 0,067) em vacas com mais de um nascimento, enquanto era 0,74 vezes menor (OR = 0,26; 95% CI: 0,096-0,70; p&lt;0,01) em rebanhos que alimentam seus filhotes com a mistura de colostro de várias vacas, em comparação com apenas dados de uso que o colostro da mãe.  Conclusão:  DJ soroprevalência foi de 10 e 70% a nível individual como a nível do rebanho, respectivamente. Os fatores a nível individual e do rebanho "paridade" e "tipo de alimentação bezerros antes do desmame" mostrou fraca associação e forte com os resultados positivos de ELISA, respectivamente.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[cattle]]></kwd>
<kwd lng="en"><![CDATA[epidemiology]]></kwd>
<kwd lng="en"><![CDATA[paratuberculosis]]></kwd>
<kwd lng="en"><![CDATA[serology]]></kwd>
<kwd lng="es"><![CDATA[epidemiología]]></kwd>
<kwd lng="es"><![CDATA[ganado]]></kwd>
<kwd lng="es"><![CDATA[paratuberculosis]]></kwd>
<kwd lng="es"><![CDATA[serología]]></kwd>
<kwd lng="pt"><![CDATA[epidemiologia]]></kwd>
<kwd lng="pt"><![CDATA[gado]]></kwd>
<kwd lng="pt"><![CDATA[paratuberculosis]]></kwd>
<kwd lng="pt"><![CDATA[sorologia]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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