<?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>2007-1124</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias pecuarias]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. de cienc. pecuarias]]></abbrev-journal-title>
<issn>2007-1124</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-11242024000400762</article-id>
<article-id pub-id-type="doi">10.22319/rmcp.v15i4.6680</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Momento de la suplementación sobre carga animal y producción de leche por hectárea de vacas Holstein en pastoreo]]></article-title>
<article-title xml:lang="en"><![CDATA[The effects of supplementation timing on stocking rate and milk production per hectare in grazing Holstein dairy cows]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castro Jaime]]></surname>
<given-names><![CDATA[Citlali Anais]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez Valverde]]></surname>
<given-names><![CDATA[Rodolfo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Burgueño Ferreira]]></surname>
<given-names><![CDATA[Juan Andrés]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez Bribiesca]]></surname>
<given-names><![CDATA[Jacinto Efrén]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Miranda Romero]]></surname>
<given-names><![CDATA[Luis Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Améndola Massiotti]]></surname>
<given-names><![CDATA[Ricardo Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma Chapingo Programa de Posgrado en Producción Animal ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Centro Internacional de Mejoramiento de Maíz y Trigo  ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<volume>15</volume>
<numero>4</numero>
<fpage>762</fpage>
<lpage>777</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11242024000400762&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11242024000400762&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11242024000400762&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El objetivo fue evaluar, en pastoreo de praderas mixta de Medicago sativa L. y Dactylis glomerata L., la respuesta de vacas Holstein Neozelandés a la suplementación con concentrado en diferentes momentos del día, sobre producción individual, carga animal y producción de leche por hectárea. Se realizaron dos experimentos, en invierno y en primavera-verano, con un diseño cruzado 3×3. Los tratamientos fueron tres momentos de oferta de concentrado (5.0 kg de MS vaca-1 día-1) como suplemento luego de la ordeña matinal (AM), de la vespertina (PM), y dividido equitativamente en ambas ordeñas (AM-PM). Las unidades experimentales fueron lotes de seis (invierno) o cinco vacas (primavera-verano) y sus respectivas áreas de pastoreo, mismas que recibieron los tratamientos. El criterio de manejo del pastoreo rotacional fue 8 cm de altura de forraje residual para todos los tratamientos; esto permitió estimar el efecto de los tratamientos sobre la carga animal. No hubo efecto (P&gt;0.05) sobre carga animal. La producción de leche por vaca en AM fue 10.2 % superior que los otros dos tratamientos en promedio, tanto en invierno (8.6 %, P=0.0002), como en primavera-verano (11.7 %, P&lt;0.0001). El incremento en producción de leche por ha (9 %) se debió a la respuesta individual y no a diferencias en carga animal. El criterio de manejo de pastoreo con altura única de forraje residual permitió, de modo sencillo, estimar la respuesta en carga animal y con ello la producción de leche por hectárea.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Concentrate supplementation can affect multiple parameters in grazing dairy systems. In mixed pastures (Medicago sativa L. and Dactylis glomerata L.) grazed by New Zealand Holstein cows, a study was done of the effects of concentrate supplementation timing on individual production, stocking rate and milk production per hectare. Two experiments were done, one in winter and another in spring-summer. Experimental design was 3x3 crossover with treatments defined by concentrate (5.0 kg DM cow-1 d-1) supplement administration times: after morning milking (AM), after afternoon milking (PM), and equally divided between both milkings (AM-PM). The experimental units were batches of six (winter) or five cows (spring-summer), which received the treatments, and their respective grazing areas. The rotational grazing management criterion was 8 cm residual forage height in all treatments, which allowed estimation of the effects of the treatments on stocking rate. Stocking rate did not differ (P&gt;0.05) between treatments. Milk production per cow in the AM treatments was an average of 10.2 % higher than the other two treatments, both in winter (8.6 %, P=0.0002) and spring-summer (11.7 %, P&lt;0.0001). The increase in milk production per hectare (9 %) was due to individual response and not to differences in stocking rate. Use of a uniform residual forage height was a simple way of estimating the response in stocking rate and thus milk production per hectare.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Concentrado]]></kwd>
<kwd lng="es"><![CDATA[Producción individual]]></kwd>
<kwd lng="es"><![CDATA[Manejo de pastoreo]]></kwd>
<kwd lng="es"><![CDATA[Diseño cruzado]]></kwd>
<kwd lng="en"><![CDATA[Concentrate]]></kwd>
<kwd lng="en"><![CDATA[Individual production]]></kwd>
<kwd lng="en"><![CDATA[Grazing Management]]></kwd>
<kwd lng="en"><![CDATA[Crossed design]]></kwd>
</kwd-group>
</article-meta>
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