<?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>2448-6132</journal-id>
<journal-title><![CDATA[Abanico veterinario]]></journal-title>
<abbrev-journal-title><![CDATA[Abanico vet]]></abbrev-journal-title>
<issn>2448-6132</issn>
<publisher>
<publisher-name><![CDATA[Sergio Martínez González]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2448-61322018000300051</article-id>
<article-id pub-id-type="doi">10.21929/abavet2018.83.3</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Productivity of Holstein dairy cows without shade at two seasons of the year]]></article-title>
<article-title xml:lang="es"><![CDATA[Productividad de vacas lecheras Holstein sin sombra en dos épocas del año]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Beauregard-García]]></surname>
<given-names><![CDATA[Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Prado-Rebolledo]]></surname>
<given-names><![CDATA[Omar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Márquez]]></surname>
<given-names><![CDATA[Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Casillas]]></surname>
<given-names><![CDATA[Arturo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Macedo-Barragán]]></surname>
<given-names><![CDATA[Rafael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Rivera]]></surname>
<given-names><![CDATA[Juan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Inter-institutional Master in Animal Production  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Colima Faculty of Veterinary Medicine and Zootechnics ]]></institution>
<addr-line><![CDATA[ Colima]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,University of Colima University Research Center for Agricultural Development ]]></institution>
<addr-line><![CDATA[ Colima]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Professor of the Inter-institutional Postgraduate in Animal Production  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Coordinator of the Inter-institutional Graduate in Animal Production  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<volume>8</volume>
<numero>3</numero>
<fpage>51</fpage>
<lpage>67</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2448-61322018000300051&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2448-61322018000300051&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2448-61322018000300051&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT In order to evaluate the effect of season on the productivity of Holstein dairy cows in a commercial herd, 10 cows were assigned to one of two treatments, cows in winter (Inv) and cows in summer (Ver). The study lasted 70 days (d) divided into two periods of five weeks, respectively. The data were collected three times per week. The animals were under the same diet in both seasons, from an integral ration based on concentrate, alfalfa hay, and corn silage. The maximum temperature-humidity index was 70 and 75 units during the winter and summer, respectively. The cows in winter had lower (P&lt;0.05) milk production, respiratory rate and rectal temperature than summer cows. The temperatures on the right flank and buttock area in winter cows were lower (P&lt;0.05), with respect to summer cows. Drinking water, floor, and environment temperatures through the black bulb were consistently lower (P&lt;0.05) during the winter season with respect to summer. Summer cows showed mild heat stress and increased 24 % plus milk yield than winter cows, but did not improve milk quality. The use of shades during the summer can improve the physiological status milk quality in lactating dairy cows.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Con el propósito de evaluar el efecto de época sobre la productividad de vacas lecheras Holstein, 10 vacas fueron asignadas a uno de dos tratamientos, vacas en invierno (Inv) y vacas en verano (Ver). El estudio tuvo una duración de 70 días (d) divididos en dos periodos de cinco semanas, respectivamente. Los datos fueron colectados tres veces por semana. Los animales fueron alimentados bajo el mismo régimen alimenticio en ambas épocas, a partir de una ración integral a base de concentrado, heno de alfalfa y silo de maíz. El índice de temperatura-humedad máximo fue de 70 y 75 unidades durante el invierno y verano, respectivamente. Las vacas Inv tuvieron menor producción de leche (P&lt;0.05), tasa respiratoria y temperatura rectal que vacas Ver. Las temperaturas de costado derecho y nalga en vacas Inv fueron menores (P&lt;0.05), respecto a vacas Ver (P&lt;0.05). Las temperaturas de agua de bebida, piso y ambiental a través del bulbo negro fueron consistentemente menores (P&lt;0.05) durante la época de invierno con respecto al verano. Las vacas Ver presentaron estrés calórico ligero e incrementaron 24% más la producción de leche respecto a vacas Inv, pero no mejoraron la calidad en leche. El uso de sombras durante el verano, puede mejorar el estado fisiológico y calidad de la leche en vacas lecheras en lactación.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Dairy cows]]></kwd>
<kwd lng="en"><![CDATA[without shade]]></kwd>
<kwd lng="en"><![CDATA[mild heat stress]]></kwd>
<kwd lng="en"><![CDATA[productivity]]></kwd>
<kwd lng="es"><![CDATA[Vacas lecheras]]></kwd>
<kwd lng="es"><![CDATA[sin sombra]]></kwd>
<kwd lng="es"><![CDATA[estrés calórico leve]]></kwd>
<kwd lng="es"><![CDATA[productividad]]></kwd>
</kwd-group>
</article-meta>
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<volume>216</volume>
<page-range>164</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
