<?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>S0120-06902024000200073</article-id>
<article-id pub-id-type="doi">10.17533/udea.rccp.v37n2a3</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Effects of non-genetic factors on milk yield and chemical composition of milk from Holstein-Friesian cows]]></article-title>
<article-title xml:lang="pt"><![CDATA[Efeitos de fatores não genéticos na composição química e na produção de leite em vacas da raça Holandesa-Frísia]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[&#350;ahin]]></surname>
<given-names><![CDATA[Onur]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,University Mu&#351; Alparslan Department of Animal Production and Technologies ]]></institution>
<addr-line><![CDATA[Mu&#351; ]]></addr-line>
<country>Turkey</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2024</year>
</pub-date>
<volume>37</volume>
<numero>2</numero>
<fpage>73</fpage>
<lpage>87</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-06902024000200073&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-06902024000200073&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-06902024000200073&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes:  Para determinar con precisión el desempeño de las vacas en términos de producción y componentes lacteos, es necesario conocer la cantidad y dirección de los factores ambientales. Aunque existen muchos estudios sobre los factores ambientales que afectan la producción de leche, no hay suficiente información sobre los efectos y la dirección de los factores ambientales en la composición de la leche.  Objetivo: Determinar los efectos de factores no genéticos, tales como temporada de parto, orden de lactancia, etapa de lactancia, edad, tamaño del rebaño sobre la producción de leche, la composición química de la leche cruda y el recuento de células somáticas (SCC) en vacas Holstein-Friesian.  Métodos:  El material del estudio estuvo compuesto por 15.354 muestras de leche cruda de 5.118 vacas Holstein-Friesian en 276 granjas lecheras en Turquía. El análisis de datos se realizó utilizando la función de modelo lineal general (GLM) del programa estadístico SPSS.  Resultados:  Los valores medios de grasa (F), proteína (P), materia seca (DM), lactosa (L), urea (U), Log10SCC de la leche fueron 3,74 ± 0,01, 3,19 ± 0,01, 11,36 ± 0,03, 4,32 ± 0,01%, 21,57 ± 0,28 mg/dL, 5.244 ± 0,01 células/mL, respectivamente. La producción máxima de leche (PMY), producción de leche de lactancia (LMY), producción de leche a los 305 días (305-d MY) y los valores de SCC fueron 33,7 ± 0,13, 8.538,33 ± 89,64, 6.479,42 ± 168,96 kg, y 224.164,34 ± 4.402,79 células/mL, respectivamente.  Conclusiones:  Se recomienda tomar medidas para mejorar el contenido de proteína, materia seca y urea de la leche en las granjas lecheras de Turquía e investigar en detalle la relación entre contenido de urea en leche cruda, mastitis subclínica y características reproductivas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background:  It is necessary to determine the extent and direction of environmental factors to accurately assess cow performance in terms of milk yield and milk components. Although many studies have explored environmental factors affecting milk yield, there is not enough information about the effects and direction of environmental factors on milk composition.  Objective: To determine the effects of non-genetic factors, such as calving season, lactation number, lactation stage, animal age, and herd size on milk yield, chemical composition of raw milk, and Somatic Cell Count (SCC) in Holstein-Friesian cows.  Methods:  Data were obtained from 15,354 raw milk samples of 5,118 Holstein-Friesian cows at 276 dairy farms in Türkiye. The data analysis was performed using the General Linear Model (GLM) feature of the SPSS statistics program.  Results:  Mean fat (F), protein (P), dry matter (DM), lactose (L), urea (U), and Log10SCC values of milk were 3.74 ± 0.01, 3.19 ± 0.01, 11.36 ± 0.03, 4.32 ± 0.01%, 21.57 ± 0.28 mg/dL, and 5.244 ± 0.01 cells/mL, respectively. Peak milk yield (PMY), lactation milk yield (LMY), 305-day milk yield (305-d MY), and SCC values were 33.7 ± 0.13, 8,538.33 ± 89.64 kg, 6,479.42 ± 168.96 kg, and 224,164.34 ± 4,402.79 cells/mL, respectively.  Conclusion: Dairy farms in Türkiye should improve protein, dry matter, and urea contents in milk and investigate in detail the relationship between raw milk urea, subclinical mastitis, and reproductive features.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo  Antecedentes: Para determinar com precisão o desempenho das vacas em termos de produção de leite e componentes do leite, é necessário conhecer a quantidade e a direção dos fatores ambientais. Embora existam muitos estudos sobre fatores ambientais que afetam a produção de leite, não há informações suficientes sobre os efeitos e a direção dos fatores ambientais na composição do leite.  Objetivo:  Determinar os efeitos de fatores não genéticos como estação de parto, ordem de lactação, estágio de lactação, idade, tamaño de la manada na produção de leite, composição química do leite cru e contagem de células somáticas (SCC) em vacas da raça Holandês-Frísia.  Métodos:  O material do estudo foi composto por 15.354 amostras de leite cru de 5.118 vacas da raça Holandesa-Frísia em 276 fazendas leiteiras na Turquia. A análise dos dados foi realizada utilizando o recurso General Linear Model (GLM) do programa estatístico SPSS.  Resultados:  Os valores médios de gordura (F), proteína (P), matéria seca (DM), lactose (L), uréia (U) e Log10SCC do leite de vaca foram encontrados como 3,74 ± 0,01, 3,19 ± 0,01, 11,36 ± 0,03, 4,32 ± 0,01%, 21,57 ± 0,28 mg/dL e 5.244 ± 0,01 células/mL, respectivamente. Pico de produção de leite (PMY), produção de leite de lactação (LMY), produção de leite em 305 dias (305-d MY) e valores de SCC foram determinados como 33,7 ± 0,13, 8.538,33 ± 89,64, 6.479,42 ± 168,96 kg e 224.164,34 ± 4.402,79 células/mL, respectivamente.  Conclusões:  Recomenda-se tomar medidas para melhorar o teor de proteína, matéria seca e uréia do leite em fazendas leiteiras na Turquia e investigar em detalhes a relação entre o teor de uréia do leite cru, mastite subclínica e características reprodutivas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[cow]]></kwd>
<kwd lng="en"><![CDATA[Holstein-Friesian]]></kwd>
<kwd lng="en"><![CDATA[milk composition]]></kwd>
<kwd lng="en"><![CDATA[milk yield]]></kwd>
<kwd lng="en"><![CDATA[non-genetic factors]]></kwd>
<kwd lng="en"><![CDATA[phenotypic correlation]]></kwd>
<kwd lng="en"><![CDATA[somatic cell count]]></kwd>
<kwd lng="es"><![CDATA[composición de la leche]]></kwd>
<kwd lng="es"><![CDATA[correlación fenotípica]]></kwd>
<kwd lng="es"><![CDATA[factores no genéticos]]></kwd>
<kwd lng="es"><![CDATA[Holstein-Friesian]]></kwd>
<kwd lng="es"><![CDATA[producción de leche]]></kwd>
<kwd lng="es"><![CDATA[recuento de células somáticas]]></kwd>
<kwd lng="es"><![CDATA[vaca]]></kwd>
<kwd lng="pt"><![CDATA[composição do leite]]></kwd>
<kwd lng="pt"><![CDATA[contagem de células somáticas]]></kwd>
<kwd lng="pt"><![CDATA[correlação fenotípica]]></kwd>
<kwd lng="pt"><![CDATA[fatores não genéticos]]></kwd>
<kwd lng="pt"><![CDATA[Holstein-Frísia]]></kwd>
<kwd lng="pt"><![CDATA[produção de leite]]></kwd>
<kwd lng="pt"><![CDATA[vaca]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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