<?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>0377-9424</journal-id>
<journal-title><![CDATA[Agronomía Costarricense]]></journal-title>
<abbrev-journal-title><![CDATA[Agron. Costarricense]]></abbrev-journal-title>
<issn>0377-9424</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica. Colegio de Ingenieros y Agrónomos. Ministerio de Agricultura y Ganadería]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0377-94242015000200077</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Factores de riesgo para la incidencia de mastitis clínica en ganado lechero de Costa Rica]]></article-title>
<article-title xml:lang="en"><![CDATA[Risk factors for clinical mastitis in dairy cattle of Costa Rica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mora]]></surname>
<given-names><![CDATA[María Gabriela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas]]></surname>
<given-names><![CDATA[Bernardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romero]]></surname>
<given-names><![CDATA[Juan José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Camacho]]></surname>
<given-names><![CDATA[Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>CR</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<volume>39</volume>
<numero>2</numero>
<fpage>77</fpage>
<lpage>90</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0377-94242015000200077&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0377-94242015000200077&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0377-94242015000200077&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[ResumenSe realizó un estudio observacional retrospectivo para evaluar posibles factores de riesgo, relacionados con la vaca y su entorno, sobre la ocurrencia de primeros eventos de mastitis clínica en ganado lechero de Costa Rica. Se contó con información de 313 406 lactancias, 101 125 vacas y 288 hatos. La frecuencia relativa de mastitis a nivel poblacional fue de 11,6%, con variaciones desde 0,3% hasta 70,7% entre los hatos. La tasa de incidencia poblacional fue de 4,65 casos por cada 10 000 días a riesgo en la lactancia, con oscilaciones entre 0,092 y 5,7 para los diferentes hatos. Mediante regresión logística se evaluaron posibles factores de riesgo que afectan la incidencia de mastitis. Se exploraron 2 modelos mixtos lineales generalizados (GLMM), sin (modelo base) y con (modelo alternativo) efectos de lactancia previa. Los factores fijos con efecto significativo fueron: zona agroecológica, grupo racial, año, número y mes de parto, periodo de lactancia, duración y producción de leche en lactancia previa e historial previo de mastitis. Las categorías de mayor vs. menor propensión a contraer mastitis fueron, respectivamente: zona bosque seco tropical (OR Odds ratio:11,03) vs. bosque húmedo tropical (OR:0,97), grupo racial Jersey×Pardo Suizo (OR:1,67) vs. Pardo Suizo (OR: 1), partos en años previos a 1995 (OR:2,19) vs. posteriores a 2010 (OR:1), número de parto 4 (OR:1,19) vs. primer parto (OR:0,54), mes de parto Marzo (OR:1,25) vs. Octubre (OR:0,95), periodo de lactancia 1-30 días (OR:104) vs. 391420 días (OR:0,94). En covariables, un incremento de 30 d en longitud de la lactancia anterior se asoció con OR de 1,04 y un incremento de 1000 kg en producción en la lactancia previa se asoció con un OR de 1,17. Estos hallazgos pueden ser útiles para el desarrollo de protocolos preventivos enfocados a reducir la incidencia de mastitis en los grupos de mayor riesgo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[AbstractA retrospective observational study was conducted to evaluate risk factors related to the cow and its environment on the occurrence of early events of clinical mastitis in dairy cattle of Costa Rica. Data on 313 406 lactations from 101 125 cows and 288 herds was available. The relative frequency of mastitis at the population level was 11.6%, ranging from 0.3% to 70.7% between herds. The population incidence rate was 4.65 cases per 10 000 days at risk in lactation, ranging from 0.092 to 5.7 between herds. Logistic regression was used to evaluate potential risk factors affecting incidence of clinical mastitis. Two generalized linear mixed models (GLMM) were explored, without (base model) and with (alternative model) effects from previous lactation. The fixed factors with significant effect were: agroecological zone, racial group, year, number and month of calving, stage of lactation, duration and milk production in previous lactation, and history of mastitis in previous lactation. Categories with higher vs. lower propensity to mastitis were, respectively: tropical dry forest (OR Odds ratio: 11.03) vs. tropical rainforest (OR: 0.97), breed type Jersey×Brown Swiss (OR: 1.67) vs. Brown Swiss (OR: 1), birth-year before 1995 (OR:2.19) vs. after 2010 (OR: 1), fourth parity (OR:1.19) vs. first parity (OR: 0.54), month of calving March (OR: 1.25) vs. October (OR: 0.95), stage of lactation 1-30 days (OR:1.04) vs. 391-420 days (OR: 0.94). In covariates, an increase of 30 d in the previous lactation length was associated with an OR of 1.04 and an increase in production of 1000 kg in the previous lactation was associated with an OR of 1.17. These findings may be useful for the development of preventive protocols aimed at reducing the incidence of mastitis in groups with a higher risk.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Factor de riesgo]]></kwd>
<kwd lng="es"><![CDATA[mastitis clínica]]></kwd>
<kwd lng="es"><![CDATA[regresión logística]]></kwd>
<kwd lng="es"><![CDATA[vacas lecheras]]></kwd>
<kwd lng="en"><![CDATA[Fisk factors]]></kwd>
<kwd lng="en"><![CDATA[clinical mastitis]]></kwd>
<kwd lng="en"><![CDATA[logistic regression]]></kwd>
<kwd lng="en"><![CDATA[dairy cows]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Incidence rate of clinical bovine mastitis in selected smallholder dairy farms in Gondar town, Ethiopia]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[ALMAW]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[MOLLA]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[MELAKU]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
</person-group>
<source><![CDATA[Ethiopian Veterinary Journal]]></source>
<year>2012</year>
<volume>16</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>93-9</page-range></nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Mastitis, prevención y control]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[ANDRESEN]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
</person-group>
<source><![CDATA[Revista de Investigaciones Veterinarias del Perú]]></source>
<year>2001</year>
<volume>12</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>55-64</page-range></nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Cow factors affecting the risk of clinical mastitis]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[BERRY]]></surname>
<given-names><![CDATA[D.P.]]></given-names>
</name>
<name>
<surname><![CDATA[MEANEY]]></surname>
<given-names><![CDATA[W.J]]></given-names>
</name>
</person-group>
<source><![CDATA[Irish Journal of Agricultural and Food Research]]></source>
<year>2005</year>
<volume>44</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>147-56</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Prevalence and Risk Factors of Mastitis in Lactating Dairy Cows in Southern Ethiopia]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[BIFFA]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[DEBELA]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[BEYENE]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
</person-group>
<source><![CDATA[International Journal of Applied Research in Veterinary Medicine]]></source>
<year>2005</year>
<volume>3</volume>
<page-range>189-98</page-range></nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[BLOWEY]]></surname>
<given-names><![CDATA[R.W.]]></given-names>
</name>
<name>
<surname><![CDATA[EDMONDSON]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
</person-group>
<source><![CDATA[Mastitis Control in Dairy Herds]]></source>
<year>2010</year>
<edition>2</edition>
<page-range>266</page-range><publisher-loc><![CDATA[Oxfordshire, UK ]]></publisher-loc>
<publisher-name><![CDATA[CAB International]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="">
<collab>COOPERATIVA DE PRODUCTORES DE LECHE DOS PINOS R.L</collab>
<source><![CDATA[Reglamento de Recibo de Leche]]></source>
<year>2010</year>
<page-range>26</page-range></nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Risk Factors Associated with Mastitis Occurrence in Dairy Herds in Benisuef, Egypt]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[ELBABLY]]></surname>
<given-names><![CDATA[M.A.]]></given-names>
</name>
<name>
<surname><![CDATA[EMEASH]]></surname>
<given-names><![CDATA[H.H.]]></given-names>
</name>
<name>
<surname><![CDATA[ASMAA]]></surname>
<given-names><![CDATA[N.M]]></given-names>
</name>
</person-group>
<source><![CDATA[World's Veterinary Journal]]></source>
<year>2013</year>
<volume>3</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>5-10</page-range></nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Occurrence of clinical and sub-clinical mastitis in dairy herds in the west littoral region in Uruguay]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[GIANNEECHINI]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[CONCHA]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[RIVERO]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[DELUCCI]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[MORENO]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
</person-group>
<source><![CDATA[Acta Veterinaria Scandinavica]]></source>
<year>2002</year>
<volume>43</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>221-30</page-range></nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[HOLDRIDGE]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
</person-group>
<source><![CDATA[Ecología basada en zonas de vida]]></source>
<year>1987</year>
<page-range>216</page-range><publisher-loc><![CDATA[San José, Costa Rica ]]></publisher-loc>
<publisher-name><![CDATA[IICA]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[KLEINBAUM]]></surname>
<given-names><![CDATA[D.G.]]></given-names>
</name>
<name>
<surname><![CDATA[KLEIN]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<source><![CDATA[Logistic regression a self-learning text. Statistics for biology and health]]></source>
<year>2010</year>
<edition>3rd</edition>
<page-range>709</page-range><publisher-loc><![CDATA[New York, USA ]]></publisher-loc>
<publisher-name><![CDATA[Springer editorial]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Prevalencia de mastitis y su relación con factores de riesgo en granjas lecheras de pequeños propietarios en Mekelle y sus alrededores]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[MEKONNEN]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[BERIHUN]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[HABTAMU]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
</person-group>
<source><![CDATA[Revista Electrónica de Veterinaria]]></source>
<year>2012</year>
<volume>13</volume>
<numero>9</numero>
<issue>9</issue>
</nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Relationship between season, lactation number and incidence of clinical mastitis in different stages of lactation in a Holstein dairy farm]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[MOOSAVI]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[MIRZAEI]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[GHAVAMI]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[TAMADON]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
</person-group>
<source><![CDATA[Veterinary Research Forum]]></source>
<year>2014</year>
<volume>5</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>13-9</page-range></nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[NIELSEN]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
</person-group>
<source><![CDATA[Economic Impact of Mastitis in Dairy Cows]]></source>
<year>2009</year>
<page-range>81</page-range><publisher-loc><![CDATA[Uppsala, Suecia ]]></publisher-loc>
<publisher-name><![CDATA[Swedish University of Agricultural Sciences]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[VAMPP: A Veterinary automated management and production control program for dairy farms. The application of MUMPS for data processing]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[NOORDHUIZEN]]></surname>
<given-names><![CDATA[J.P.T.M.]]></given-names>
</name>
<name>
<surname><![CDATA[BUURMAN]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
</person-group>
<source><![CDATA[Veterinary Quarterly]]></source>
<year>1984</year>
<volume>6</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>66-72</page-range></nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Factores de riesgo asociados a la prevalencia de mastitis clínica y subclínica]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[NOVOA]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[ARMENTEROS]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[ABELEDO]]></surname>
<given-names><![CDATA[M.A.]]></given-names>
</name>
<name>
<surname><![CDATA[CASANOVAS]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[VALERA]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[CABALLERO]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[PULIDO]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
</person-group>
<source><![CDATA[Revista Salud Animal]]></source>
<year>2005</year>
<volume>27</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>84-8</page-range></nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[The Effect of Season on Somatic Cell Count and the Incidence of Clinical Mastitis]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[OLDE RIEKERINK]]></surname>
<given-names><![CDATA[R.M.]]></given-names>
</name>
<name>
<surname><![CDATA[BARKEMA]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[STRYHN]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Dairy Science]]></source>
<year>2007</year>
<volume>90</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>1704-15</page-range></nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[The impact of genetic selection for increased milk yield on the welfare of dairy cows]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[OLTENACU]]></surname>
<given-names><![CDATA[P.A.]]></given-names>
</name>
<name>
<surname><![CDATA[BROOM]]></surname>
<given-names><![CDATA[D.M]]></given-names>
</name>
</person-group>
<source><![CDATA[Animal Welfare]]></source>
<year>2010</year>
<volume>19</volume>
<numero>S</numero>
<issue>S</issue>
<page-range>39-49</page-range></nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Somatic cell count status across the dry period as a risk factor for the development of clinical mastitis in the subsequent lactation]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[PANTOJA]]></surname>
<given-names><![CDATA[J.C.F.]]></given-names>
</name>
<name>
<surname><![CDATA[HULLAND]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[RUEGG]]></surname>
<given-names><![CDATA[P.L]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Dairy Science]]></source>
<year>2009</year>
<volume>92</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>139-48</page-range></nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[PE&#769;REZ]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[BAAYEN]]></surname>
<given-names><![CDATA[M.T.]]></given-names>
</name>
<name>
<surname><![CDATA[CAPELLA]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[BARKEMA]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Development of a livestock information system for Costa Rica]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Kuil]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Palin]]></surname>
<given-names><![CDATA[R.W.]]></given-names>
</name>
<name>
<surname><![CDATA[Huhn]]></surname>
<given-names><![CDATA[J.E.]]></given-names>
</name>
</person-group>
<source><![CDATA[Livestock Production and Diseases in the Tropics]]></source>
<year>1989</year>
<page-range>221-4</page-range><publisher-loc><![CDATA[Utrecht; The Netherlands ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Events occurring during the previous lactation, the dry period, and peripartum as risk factors for early lactation mastitis in cows receiving 2 different intramammary dry cow therapies]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[PINEDO]]></surname>
<given-names><![CDATA[P.J.]]></given-names>
</name>
<name>
<surname><![CDATA[FLEMING]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[RISCO]]></surname>
<given-names><![CDATA[C.A]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Dairy Science]]></source>
<year>2012</year>
<volume>95</volume>
<numero>12</numero>
<issue>12</issue>
<page-range>7015-26</page-range></nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[A comparison between Holstein-Friesian and Jersey dairy cows and their F1 cross with regard to milk yield, somatic cell score, mastitis, and milking characteristics under grazing conditions]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[PRENDIVILLE]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[PIERCE]]></surname>
<given-names><![CDATA[K.M.]]></given-names>
</name>
<name>
<surname><![CDATA[BUCKLEY]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Dairy Science]]></source>
<year>2010</year>
<volume>93</volume>
<numero>6</numero>
<issue>6</issue>
<page-range>2741-50</page-range></nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[QUESADA]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
</person-group>
<source><![CDATA[Incidencia de mastitis subclínica en seis fincas de la zona de San Carlos]]></source>
<year>1994</year>
<page-range>76</page-range><publisher-loc><![CDATA[San Carlos, Costa Rica ]]></publisher-loc>
<publisher-name><![CDATA[Instituto Tecnológico de Costa Rica]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Prevalence and risk factors of mastitis in dairy cows]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[RAHMAN]]></surname>
<given-names><![CDATA[M.A.]]></given-names>
</name>
<name>
<surname><![CDATA[BHUIYAN]]></surname>
<given-names><![CDATA[M.M.U.]]></given-names>
</name>
<name>
<surname><![CDATA[KAMAL]]></surname>
<given-names><![CDATA[M.M.]]></given-names>
</name>
<name>
<surname><![CDATA[SHAMSUDDIN]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<source><![CDATA[The Bangladesh Veterinarian]]></source>
<year>2009</year>
<volume>26</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>54-60</page-range></nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Factores asociados a mastitis en vacas de la microcuenca lechera del altiplano norte de Antioquia, Colombia]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[RAMÍREZ]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[ARROYAVE]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<name>
<surname><![CDATA[CERÓN]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[JARAMILLO]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[CERÓN]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[PALACIO]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
</person-group>
<source><![CDATA[Revista Medicina Veterinaria]]></source>
<year>2011</year>
<volume>22</volume>
<page-range>31-42</page-range></nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Risk factors for clinical mastitis, ketosis, and pneumonia in dairy cattle on organic and small conventional farms in the United States]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[RICHERT]]></surname>
<given-names><![CDATA[R.M.]]></given-names>
</name>
<name>
<surname><![CDATA[CICCONI]]></surname>
<given-names><![CDATA[K.M.]]></given-names>
</name>
<name>
<surname><![CDATA[GAMROTH]]></surname>
<given-names><![CDATA[M.J.]]></given-names>
</name>
<name>
<surname><![CDATA[SCHUKKEN]]></surname>
<given-names><![CDATA[Y.H.]]></given-names>
</name>
<name>
<surname><![CDATA[STIGLBAUER]]></surname>
<given-names><![CDATA[K.E.]]></given-names>
</name>
<name>
<surname><![CDATA[RUEGG]]></surname>
<given-names><![CDATA[P.L]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Dairy Science]]></source>
<year>2013</year>
<volume>96</volume>
<numero>7</numero>
<issue>7</issue>
<page-range>4269-85</page-range></nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[ROTHMAN]]></surname>
<given-names><![CDATA[K.J.]]></given-names>
</name>
<name>
<surname><![CDATA[GREENLAND]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[LASH]]></surname>
<given-names><![CDATA[T.L]]></given-names>
</name>
</person-group>
<source><![CDATA[Modern Epidemiology]]></source>
<year>2008</year>
<edition>3rd</edition>
<page-range>758</page-range><publisher-loc><![CDATA[Philadelphia, PA ]]></publisher-loc>
<publisher-name><![CDATA[Lippincott, Williams & Wilkins]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B27">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Genetics of resistance to mastitis in dairy cattle]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[RUPP]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[BOCCHARD]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
</person-group>
<source><![CDATA[Veterinary Research]]></source>
<year>2004</year>
<volume>34</volume>
<numero>5</numero>
<issue>5</issue>
<page-range>671-88</page-range></nlm-citation>
</ref>
<ref id="B28">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Prevalencia y factores asociados a la mastitis subclínica bovina en los Andes peruanos]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[SANTIVAN&#771;EZ]]></surname>
<given-names><![CDATA[C.S.]]></given-names>
</name>
<name>
<surname><![CDATA[GÓMEZ]]></surname>
<given-names><![CDATA[O.E.]]></given-names>
</name>
<name>
<surname><![CDATA[CA&#769;RDENAS]]></surname>
<given-names><![CDATA[L.A.]]></given-names>
</name>
<name>
<surname><![CDATA[ESCOBEDO]]></surname>
<given-names><![CDATA[M.H.]]></given-names>
</name>
<name>
<surname><![CDATA[BUSTINZA]]></surname>
<given-names><![CDATA[R.H.]]></given-names>
</name>
<name>
<surname><![CDATA[PEN&#771;A]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
</person-group>
<source><![CDATA[Veterinaria y Zootecnia]]></source>
<year>2013</year>
<volume>7</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>92-104</page-range></nlm-citation>
</ref>
<ref id="B29">
<nlm-citation citation-type="">
<collab>SAS INST. INC</collab>
<source><![CDATA[SAS/STAT(r) User's guide: Statistics; Version 9.3]]></source>
<year>2009</year>
<page-range>8640</page-range><publisher-loc><![CDATA[Cary; NC, USA ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B30">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Correlated time to event data: Modeling repeated clinical mastitis data from dairy cattle in New York State]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[SCHUKKEN]]></surname>
<given-names><![CDATA[Y.H.]]></given-names>
</name>
<name>
<surname><![CDATA[BARB]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[HERTL]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[GRO&#776;HN]]></surname>
<given-names><![CDATA[Y.T]]></given-names>
</name>
</person-group>
<source><![CDATA[Preventive Veterinary Medicine]]></source>
<year>2010</year>
<volume>97</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>150-6</page-range></nlm-citation>
</ref>
<ref id="B31">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[The Influence of Cow Factors on the Incidence of Clinical Mastitis in Dairy Cows]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[STEENEVELD]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[HOGEVEEN]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[BARKEMA]]></surname>
<given-names><![CDATA[H.W.]]></given-names>
</name>
<name>
<surname><![CDATA[VAN DEN BROEK]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[HUIRNE]]></surname>
<given-names><![CDATA[R.B.M]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Dairy Science]]></source>
<year>2008</year>
<volume>91</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>1391-402</page-range></nlm-citation>
</ref>
<ref id="B32">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Low Somatic Cell Count: a Risk Factor for Subsequent Clinical Mastitis in a Dairy Herd]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[SURIYASATHAPORN]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[SCHUKEN]]></surname>
<given-names><![CDATA[Y.H.]]></given-names>
</name>
<name>
<surname><![CDATA[NIELEN]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[BRAND]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Dairy Science]]></source>
<year>2000</year>
<volume>83</volume>
<numero>6</numero>
<issue>6</issue>
<page-range>1248-55</page-range></nlm-citation>
</ref>
<ref id="B33">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Análisis multivariado para caracterización y clasificación de hatos lecheros en Costa Rica]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[VARGAS]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[SOLÍS]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<name>
<surname><![CDATA[SA&#769;ENZ]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[LEÓN]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
</person-group>
<source><![CDATA[Agronomía Mesoamericana]]></source>
<year>2013</year>
<volume>24</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>257-75</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
