<?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>1659-4266</journal-id>
<journal-title><![CDATA[Cuadernos de Investigación UNED]]></journal-title>
<abbrev-journal-title><![CDATA[Cuadernos de Investigación UNED]]></abbrev-journal-title>
<issn>1659-4266</issn>
<publisher>
<publisher-name><![CDATA[Universidad Estatal a Distancia de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1659-42662021000200002</article-id>
<article-id pub-id-type="doi">10.22458/urj.v13i2.3459</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Rendimientos productivos, morfología y microbiología de los huevos de gallinas Hy-Line Brown, Novogen, Rhode Island Red y Sex Link]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chavarría Zamora]]></surname>
<given-names><![CDATA[Sianny]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chacón Villalobos]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[WingChing-Jones]]></surname>
<given-names><![CDATA[Rodolfo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zamora Sanabria]]></surname>
<given-names><![CDATA[Rebeca]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Costa Rica Escuela de Zootecnia ]]></institution>
<addr-line><![CDATA[San José ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Costa Rica Estación Experimental Alfredo Volio Mata ]]></institution>
<addr-line><![CDATA[Cartago ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Costa Rica Escuela de Zootecnia, Centro de Investigación en Nutrición Animal ]]></institution>
<addr-line><![CDATA[San José ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de Costa Rica Escuela de Zootecnia, Centro de Investigación en Nutrición Animal ]]></institution>
<addr-line><![CDATA[San José ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<volume>13</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-42662021000200002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-42662021000200002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-42662021000200002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN. Introducción: La producción comercial de huevos requiere comprender cómo se ve afectada la calidad del huevo por condiciones de producción, sistemas de alojamiento, bienestar animal, edad de las aves, y raza. Objetivo: Describir las características del huevo de cuatro razas de pollos y gallinas en Costa Rica. Métodos: En 2017 estudiamos la producción de huevos de cuatro razas de gallina en Turrialba, Costa Rica, registrando las condiciones de producción, rendimiento y morfología y microbiología del huevo (Salmonella spp., Escherichia coli, coliformes totales y recuento aeróbico total). Resultados: Las razas difirieron en rendimiento, y el peso del huevo y grosor de la cáscara aumentaron con la edad. Solo el sistema de jaulas y las gallinas con acceso a pastoreo tenían niveles aceptables de contaminación microbiológica. Conclusiones: Hay diferencias entre todas las características productivas y morfológicas evaluadas para el huevo, cuando se consideró el alojamiento, la edad y la genética.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT. ''Productive parameters, morphology and microbiology of eggs produced by Hy-Line Brown, Novogen, Rhode Island Red and Sex Link hens''. Introduction: Commercial egg production requires an understanding of how egg quality is affected by production conditions, housing systems, animal welfare, bird age, and breed. Objective: To describe egg characteristics of four chicken breeds in Costa Rica. Methods: We studied the egg production of four breeds, in 2017 in Turrialba, Costa Rica, recording production conditions, yield, and egg morphology and microbiology (Salmonella spp., Escherichia coli, total coliforms and total aerobic count). Results: Breeds differed in yield, and egg weight and shell thickness increased with age. Only the cage system and free-range hens had acceptable levels of microbiological contamination. Conclusions: There were differences between all the productive and morphological characteristics evaluated for the egg, when housing, age and genetics were considered.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Egg]]></kwd>
<kwd lng="en"><![CDATA[hen housing systems]]></kwd>
<kwd lng="en"><![CDATA[morphology]]></kwd>
<kwd lng="en"><![CDATA[production]]></kwd>
<kwd lng="en"><![CDATA[microbiology]]></kwd>
<kwd lng="es"><![CDATA[Huevo]]></kwd>
<kwd lng="es"><![CDATA[alojamiento para gallinas]]></kwd>
<kwd lng="es"><![CDATA[morfología]]></kwd>
<kwd lng="es"><![CDATA[producción]]></kwd>
<kwd lng="es"><![CDATA[microbiología]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="">
<collab>Administración Nacional de Medicamentos, Alimentos y Tecnología Médica (ANMAT)</collab>
<source><![CDATA[Análisis microbiológico de los alimentos: metodología analítica oficial: microorganismos indicadores. Red Nacional de Laboratorios Oficiales de Análisis de Alimentos]]></source>
<year>2014</year>
</nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Aguirre]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Pizarro]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Panorama y mercado del huevo. Oficina de Estudios y Políticas Agrarias del Ministerio de Agricultura del Gobierno de Chile]]></source>
<year>2018</year>
</nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="book">
<collab>American Veterinary Medical Association</collab>
<source><![CDATA[Literature review on the welfare implications of laying hen housing]]></source>
<year>2012</year>
<publisher-name><![CDATA[American Veterinary Medical Association]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Arias]]></surname>
<given-names><![CDATA[J. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Fernández]]></surname>
<given-names><![CDATA[M. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Nys]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
</person-group>
<source><![CDATA[¿Qué se entiende por un huevo fresco? TECNOVET]]></source>
<year>1998</year>
</nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bain]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[McDade]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Burchmore]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Law]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Wilson]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Schmutz]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Preisinger]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Dunn]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Enhancing the egg's natural defence against bacterial penetration by increasing cuticle deposition]]></article-title>
<source><![CDATA[Animal Genetics]]></source>
<year>2013</year>
<volume>44</volume>
<numero>6</numero>
<issue>6</issue>
<page-range>661-8</page-range></nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="">
<collab>Tetra</collab>
<source><![CDATA[Bábolna Harco comercial layer management guide]]></source>
<year>2021</year>
</nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bovsková]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Míková]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Panovská]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Evaluation of egg yolk color]]></article-title>
<source><![CDATA[Czech Journal Food Science]]></source>
<year>2014</year>
<volume>32</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>213-7</page-range></nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="">
<collab>Cámara Nacional de Avicultores de Costa Rica (CANAVI)</collab>
<source><![CDATA[CANAVI presenta resultados de campaña de promoción de consumo de huevo. Cámara Nacional de Avicultores de Costa Rica]]></source>
<year>2016</year>
</nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Calik]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effect of length of productive life of Rhode Island Red (R-11) hens on their performance and egg quality. Acta Sci. Pol]]></article-title>
<source><![CDATA[Zootechnica]]></source>
<year>2014</year>
<volume>13</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>39-50</page-range></nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cannavan]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Ball]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Glenn Kennedy]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Nicarbazin contamination in feeds as a cause of residues in eggs]]></article-title>
<source><![CDATA[Food Additives and Contaminants]]></source>
<year>2000</year>
<volume>17</volume>
<numero>10</numero>
<issue>10</issue>
<page-range>829-36</page-range></nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Castelló]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Barragán]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Barroeta]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Calvet]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<source><![CDATA[Producción de huevos]]></source>
<year>2010</year>
<publisher-loc><![CDATA[España ]]></publisher-loc>
<publisher-name><![CDATA[Real Escuela de Avicultura]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Chang-Ho]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Jong-Ho]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Jae-Cheong]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Kyung-Woo]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Age-related changes in egg quality of Hy-Line Brown hens]]></article-title>
<source><![CDATA[International Journal of Poultry Science]]></source>
<year>2014</year>
<volume>13</volume>
<numero>9</numero>
<issue>9</issue>
<page-range>510-4</page-range></nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Chauveau-Duriot]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Thomas]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Portelli]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Doreau]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Carotenoids content in forages: variation during conservation]]></article-title>
<source><![CDATA[Rencontre Recherches Ruminats]]></source>
<year>2005</year>
<volume>12</volume>
<page-range>117</page-range></nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cruz]]></surname>
<given-names><![CDATA[A. I.]]></given-names>
</name>
</person-group>
<source><![CDATA[Implementación de un sistema para la producción de huevo comercial de gallinas Sex Link y Rhode Island con acceso a pastoreo (Tesis de Licenciatura)]]></source>
<year>2018</year>
<publisher-loc><![CDATA[San José, Costa Rica ]]></publisher-loc>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[De Reu]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Gryspeerdt]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Messens]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Heyndrickw]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Uyttendaele]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Debevere]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Herman]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Eggshell factors influencing eggshell penetration and whole egg contamination by different bacteria, including Salmonella Enteritidis]]></article-title>
<source><![CDATA[International Journal of Food Microbiology]]></source>
<year>2006</year>
<volume>112</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>253-60</page-range></nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Domínguez]]></surname>
<given-names><![CDATA[F. A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Aspectos microbiológicos del huevo y sus derivados (Tesis de Licenciatura)]]></source>
<year>2012</year>
<publisher-loc><![CDATA[México ]]></publisher-loc>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="book">
<collab>European Commission</collab>
<source><![CDATA[Attitudes of Consumers towards the Welfare of Farmed Animals]]></source>
<year>2005</year>
<volume>63</volume>
<numero>2</numero>
<issue>2</issue>
<publisher-loc><![CDATA[Brussels, Belgium ]]></publisher-loc>
<publisher-name><![CDATA[Special Eurobarometer]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="book">
<collab>European Commission</collab>
<source><![CDATA[Attitudes of EU citizens towards Animal Welfare]]></source>
<year>2007</year>
<page-range>270</page-range><publisher-loc><![CDATA[Brussels, Belgium ]]></publisher-loc>
<publisher-name><![CDATA[Special Eurobarometer]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="book">
<collab>European Commission</collab>
<source><![CDATA[Attitudes of EU citizens towards Animal Welfare]]></source>
<year>2007</year>
<publisher-name><![CDATA[European Commission: Special Eurobarometer]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ferrante]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Lolli]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Vezzoli]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Guidobono-Cavalchini]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effects of two different rearing systems (organic and barn) on production performance, animal welfare traits and egg quality characteristics in laying hens]]></article-title>
<source><![CDATA[Italian Journal of Animal Science]]></source>
<year>2009</year>
<volume>8</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>165-74</page-range></nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Fossum]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<name>
<surname><![CDATA[Jansson]]></surname>
<given-names><![CDATA[D. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Etterlin]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Vagsholm]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Causes of mortality in laying hens in different housing systems in 2001 to 2004]]></article-title>
<source><![CDATA[Acta Veterinaria Scandinavica]]></source>
<year>2009</year>
<volume>51</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>1-9</page-range></nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Guier]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Comparación de las condiciones de producción y la calidad microbiológica, fisicoquímica y sensorial de huevos provenientes de gallinas de pastoreo y de gallinas confinadas en sistema convencional. (Tesis de Licenciatura, Universidad de Costa Rica)]]></source>
<year>2017</year>
</nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hocking]]></surname>
<given-names><![CDATA[P. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Bain]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Channing]]></surname>
<given-names><![CDATA[C. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Fleming]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Wilson]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Genetic variation for egg production, egg quality and bone strength in selected and traditional breeds of laying fowl]]></article-title>
<source><![CDATA[British Poultry Science]]></source>
<year>2003</year>
<volume>44</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>365-73</page-range></nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Holt]]></surname>
<given-names><![CDATA[P. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Davies]]></surname>
<given-names><![CDATA[R. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Dewulf]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Gast]]></surname>
<given-names><![CDATA[R. K.]]></given-names>
</name>
<name>
<surname><![CDATA[Huwe]]></surname>
<given-names><![CDATA[J. K.]]></given-names>
</name>
<name>
<surname><![CDATA[Jones]]></surname>
<given-names><![CDATA[D. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Waltman]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Willian]]></surname>
<given-names><![CDATA[K.R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The impact of different housing systems on egg safety and quality]]></article-title>
<source><![CDATA[Poultry Science]]></source>
<year>2011</year>
<volume>90</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>251-62</page-range></nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hughes]]></surname>
<given-names><![CDATA[B. O.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Health, Welfare and Productivity. Poultry Science Symposium Series Volume 30. Edited by Victoria Sandilands and Paul M. Hocking]]></article-title>
<source><![CDATA[British Poultry Science]]></source>
<year>2012</year>
<volume>53</volume>
<numero>6</numero>
<issue>6</issue>
<page-range>843-5</page-range></nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="">
<collab>Humane Society International (HSI)</collab>
<source><![CDATA[Día Mundial del Huevo Resalta la Creciente Popularidad de los Huevos de Pastoreo. Humane Society International]]></source>
<year>2013</year>
</nlm-citation>
</ref>
<ref id="B27">
<nlm-citation citation-type="">
<collab>Hy-Line</collab>
<source><![CDATA[Ponedoras comerciales Hy-Line Brown. Guía de manejo]]></source>
<year>2018</year>
</nlm-citation>
</ref>
<ref id="B28">
<nlm-citation citation-type="">
<collab>Instituto Meteorológico Nacional (IMN)</collab>
<source><![CDATA[Boletín Meteorológico Mensual]]></source>
<year>2017</year>
</nlm-citation>
</ref>
<ref id="B29">
<nlm-citation citation-type="">
<collab>Instituto Nacional de Estadística y Censo (INEC)</collab>
<source><![CDATA[VI Censo Nacional Agropecuario: Actividades Pecuarias, Prácticas y Servicios Agropecuarios. Instituto Nacional de Estadística y Censos, Costa Rica]]></source>
<year>2015</year>
</nlm-citation>
</ref>
<ref id="B30">
<nlm-citation citation-type="">
<collab>International Egg Commission</collab>
<source><![CDATA[]]></source>
<year>2015</year>
</nlm-citation>
</ref>
<ref id="B31">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Islam]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Impact of age and feed on egg production of Novogen Brown layer bird (Tesis de Doctorado)]]></source>
<year>2018</year>
<publisher-loc><![CDATA[Bangladesh ]]></publisher-loc>
<publisher-name><![CDATA[Chittagong Veterinary and Animal Sciences University]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B32">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Jones]]></surname>
<given-names><![CDATA[D. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Cox]]></surname>
<given-names><![CDATA[N. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Guard]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Fedorka-Cray]]></surname>
<given-names><![CDATA[P. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Buhr]]></surname>
<given-names><![CDATA[R. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Gast]]></surname>
<given-names><![CDATA[R. K.]]></given-names>
</name>
<name>
<surname><![CDATA[Abdo]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Rigsby]]></surname>
<given-names><![CDATA[L. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Plumblee]]></surname>
<given-names><![CDATA[J. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Karcher]]></surname>
<given-names><![CDATA[D. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Robinson]]></surname>
<given-names><![CDATA[R. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Blatchford]]></surname>
<given-names><![CDATA[R. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Makagon]]></surname>
<given-names><![CDATA[M. M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Microbiological impact of three commercial laying hen housing systems]]></article-title>
<source><![CDATA[Poultry Science]]></source>
<year>2014</year>
<volume>94</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>544-51</page-range></nlm-citation>
</ref>
<ref id="B33">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kaiser]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Lamont]]></surname>
<given-names><![CDATA[S. J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Genetic line differences in survival and pathogen load in young layer chicks after Salmonella enterica serovar Enteritidis exposure]]></article-title>
<source><![CDATA[Poultry Science]]></source>
<year>2001</year>
<volume>80</volume>
<numero>8</numero>
<issue>8</issue>
<page-range>1105-8</page-range></nlm-citation>
</ref>
<ref id="B34">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Krawczyk]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Gornowicz]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Quality of eggs from hens kept in two different free-range systems in comparison with a barn system]]></article-title>
<source><![CDATA[Archive fur Geflugelkunde]]></source>
<year>2010</year>
<volume>74</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>151-7</page-range></nlm-citation>
</ref>
<ref id="B35">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lay]]></surname>
<given-names><![CDATA[D. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Fulton]]></surname>
<given-names><![CDATA[R. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Hester]]></surname>
<given-names><![CDATA[P. Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Karcher]]></surname>
<given-names><![CDATA[D. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Kjaer]]></surname>
<given-names><![CDATA[J. B.]]></given-names>
</name>
<name>
<surname><![CDATA[Mench]]></surname>
<given-names><![CDATA[J. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Mullens]]></surname>
<given-names><![CDATA[B. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Newberry]]></surname>
<given-names><![CDATA[R. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Nicol]]></surname>
<given-names><![CDATA[C. J.]]></given-names>
</name>
<name>
<surname><![CDATA[O'Sullivan]]></surname>
<given-names><![CDATA[N. P.]]></given-names>
</name>
<name>
<surname><![CDATA[Porter]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Hen welfare in different housing systems]]></article-title>
<source><![CDATA[Poultry Science]]></source>
<year>2011</year>
<volume>90</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>278-94</page-range></nlm-citation>
</ref>
<ref id="B36">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Leeson]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Caston]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Summers]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Layer performance of four strains of Leghorn pullets subjected to various rearing programs]]></article-title>
<source><![CDATA[Poultry Science]]></source>
<year>1997</year>
<volume>76</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>1-5</page-range></nlm-citation>
</ref>
<ref id="B37">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Leinonen]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Williams]]></surname>
<given-names><![CDATA[A. G.]]></given-names>
</name>
<name>
<surname><![CDATA[Wiseman]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Guy]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Kyriazakis]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Predicting the environmental impacts of chicken systems in the United Kingdom through a life cycle assessment: Egg production systems]]></article-title>
<source><![CDATA[Poultry Science]]></source>
<year>2012</year>
<volume>91</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>26-40</page-range></nlm-citation>
</ref>
<ref id="B38">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Leyendecker]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Hamann]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Hartung]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Kamphues]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Ring]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Glünder]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Ahlers]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Sander]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Neumann]]></surname>
<given-names><![CDATA[U.]]></given-names>
</name>
<name>
<surname><![CDATA[Distl]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Analysis of genotype-environment interactions between layer lines and housing systems for performance trails, egg quality and bone strength. 2nd communication: egg quality traits]]></article-title>
<source><![CDATA[Züchtungskunde]]></source>
<year>2001</year>
<volume>73</volume>
<page-range>308-23</page-range></nlm-citation>
</ref>
<ref id="B39">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lewco]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Gornowicz]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Egg albumen quality as affected by bird origin]]></article-title>
<source><![CDATA[Journal of Central European Agriculture]]></source>
<year>2009</year>
<volume>10</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>455-64</page-range></nlm-citation>
</ref>
<ref id="B40">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lin]]></surname>
<given-names><![CDATA[Y. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Chen]]></surname>
<given-names><![CDATA[T. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Wu]]></surname>
<given-names><![CDATA[Y. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Lee]]></surname>
<given-names><![CDATA[Y. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Tan]]></surname>
<given-names><![CDATA[F. J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effects of egg washing and storage temperature on the quality of eggshell cuticle and eggs]]></article-title>
<source><![CDATA[Food Chemistry]]></source>
<year>2016</year>
<volume>211</volume>
<page-range>687-93</page-range></nlm-citation>
</ref>
<ref id="B41">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[MacKenney]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Monzón]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
</person-group>
<source><![CDATA[Evaluación de las líneas de gallinas ponedoras Hy-Line CV-22 Y Dekalb White en un sistema de semipastoreo en Zamorano, Honduras]]></source>
<year>2014</year>
</nlm-citation>
</ref>
<ref id="B42">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mertens]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Vaesen]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Loffel]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Kemps]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Kamers]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Perianu]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Zoons]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Darius]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Decuypere]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[De Baerdemaeker]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[De Ketelaere]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The transmission color value: A novel egg quality measure for recording shell color used for monitoring the stress and health status of a brown layer flock]]></article-title>
<source><![CDATA[Poultry Science]]></source>
<year>2010</year>
<volume>89</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>609-17</page-range></nlm-citation>
</ref>
<ref id="B43">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Miao]]></surname>
<given-names><![CDATA[Z. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Glatz]]></surname>
<given-names><![CDATA[P. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Ru]]></surname>
<given-names><![CDATA[J. Y.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Free-range Poultry Production - A Review]]></article-title>
<source><![CDATA[Asian- Australian Journal of Animal Sciences]]></source>
<year>2005</year>
<volume>18</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>113-32</page-range></nlm-citation>
</ref>
<ref id="B44">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Nocella]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Hubbard]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Scarpa]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[, Consumer Willingness to Pay, and Trust: Results of a Cross-National Survey]]></article-title>
<source><![CDATA[Applied Economic Perspectives and Policy]]></source>
<year>2009</year>
<volume>32</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>275-97</page-range></nlm-citation>
</ref>
<ref id="B45">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Noziére]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Graulet]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Lucas]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Martin]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Groiler]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Doreau]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Carotenoids for ruminants: From forages to dairy products]]></article-title>
<source><![CDATA[Animal Feed Science and Technology]]></source>
<year>2006</year>
<volume>131</volume>
<numero>3-4</numero>
<issue>3-4</issue>
<page-range>418-50</page-range></nlm-citation>
</ref>
<ref id="B46">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Nys]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Gautron]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[McKee]]></surname>
<given-names><![CDATA[M. D.]]></given-names>
</name>
<name>
<surname><![CDATA[Garcia-Ruiz]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Hincke]]></surname>
<given-names><![CDATA[M. T.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Biochemical and functional characterization of eggshell matrix proteins in hens]]></article-title>
<source><![CDATA[World's Poultry Science Journal]]></source>
<year>2001</year>
<volume>57</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>401-13</page-range></nlm-citation>
</ref>
<ref id="B47">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Okamura]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Kamijima]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Miyamoto]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Tani]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Sasai]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Baba]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Differences among six Salmonella serovars in abilities to colonize reproductive organs and to contaminate eggs in laying hens]]></article-title>
<source><![CDATA[Avian Diseases]]></source>
<year>2001</year>
<volume>45</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>61-9</page-range></nlm-citation>
</ref>
<ref id="B48">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Peña]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Castro]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Martínez]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Conocimientos, opiniones y prácticas respecto al huevo de gallina en familias de comunidades urbana-rural, Costa Rica]]></article-title>
<source><![CDATA[Revista Costarricense de Salud Pública]]></source>
<year>2011</year>
<volume>20</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>32-9</page-range></nlm-citation>
</ref>
<ref id="B49">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pérez-Bonilla]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Novoa]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Garcia]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Mohiti-Asli]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Frikha]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Mateos]]></surname>
<given-names><![CDATA[G. G.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effects of energy concentration of the diet on productive performance and egg quality of brown egg-laying hens differing in initial body weight]]></article-title>
<source><![CDATA[Poultry Science]]></source>
<year>2012</year>
<volume>91</volume>
<numero>12</numero>
<issue>12</issue>
<page-range>3156-66</page-range></nlm-citation>
</ref>
<ref id="B50">
<nlm-citation citation-type="">
<collab>RTCR (Reglamento Técnico 397:2006)</collab>
<source><![CDATA[Huevos frescos o refrigerados de gallina para consumo humano No. 33115. Ministerio de Agricultura y Ganadería]]></source>
<year>2006</year>
</nlm-citation>
</ref>
<ref id="B51">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rizzi]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Chiericato]]></surname>
<given-names><![CDATA[G.M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Chemical composition of meat and egg yolk of hybrid and Italian breed hens reared using an organic production system]]></article-title>
<source><![CDATA[Poultry Science]]></source>
<year>2010</year>
<volume>89</volume>
<numero>6</numero>
<issue>6</issue>
<page-range>1239-51</page-range></nlm-citation>
</ref>
<ref id="B52">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rizzi]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Marangon]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Quality of organic eggs of hybrid and Italian breed hens]]></article-title>
<source><![CDATA[Poultry Science]]></source>
<year>2012</year>
<volume>91</volume>
<numero>9</numero>
<issue>9</issue>
<page-range>2330-40</page-range></nlm-citation>
</ref>
<ref id="B53">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Tipificación de la calidad del huevo de gallina ecológico y convencional. Universidad Politécnica de Valencia]]></source>
<year>2016</year>
</nlm-citation>
</ref>
<ref id="B54">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ruíz]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
</person-group>
<source><![CDATA[Los 5 componentes del mercado europeo del huevo. Industria Avícola]]></source>
<year>2018</year>
</nlm-citation>
</ref>
<ref id="B55">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Samiullah]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Omar]]></surname>
<given-names><![CDATA[A. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Roberts]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Chousalkar]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effect of production system and flock age on eggshell and egg internal quality measurements]]></article-title>
<source><![CDATA[Poultry Science]]></source>
<year>2017</year>
<volume>96</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>246-58</page-range></nlm-citation>
</ref>
<ref id="B56">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Scholtyssek]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<source><![CDATA[Manual de Avicultura Moderna]]></source>
<year>1970</year>
<publisher-loc><![CDATA[España ]]></publisher-loc>
<publisher-name><![CDATA[Editorial Acribia]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B57">
<nlm-citation citation-type="">
<collab>SEPSA (Secretaría Ejecutiva de Planificación Sectorial Agropecuaria)</collab>
<source><![CDATA[Boletín Estadístico Agropecuario. No. 26. SEPSA]]></source>
<year>2016</year>
</nlm-citation>
</ref>
<ref id="B58">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Silversides]]></surname>
<given-names><![CDATA[F. G.]]></given-names>
</name>
<name>
<surname><![CDATA[Budgell]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The Relationships Among Measures of Egg Albumen Height, pH, and Whipping Volume]]></article-title>
<source><![CDATA[Poultry Science]]></source>
<year>2004</year>
<volume>83</volume>
<numero>10</numero>
<issue>10</issue>
<page-range>1619-23</page-range></nlm-citation>
</ref>
<ref id="B59">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Soko&#322;owicz]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Krawczyk]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Dykiel]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effect of alternative housing system and hen genotype on egg quality characteristics]]></article-title>
<source><![CDATA[Emirates Journal of Food and Agriculture]]></source>
<year>2018</year>
<volume>30</volume>
<numero>8</numero>
<issue>8</issue>
<page-range>695-703</page-range></nlm-citation>
</ref>
<ref id="B60">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sparks]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Microbiology of fresh eggs]]></article-title>
<source><![CDATA[Encyclopedia of Food Microbiology]]></source>
<year>2014</year>
</nlm-citation>
</ref>
<ref id="B61">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Travel]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Lopes]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Facteurs physiologiques et environnementauxinfluençant la production et la qualité de l'oeuf]]></article-title>
<source><![CDATA[INRAE Productions Animales]]></source>
<year>2010</year>
<volume>23</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>155-66</page-range></nlm-citation>
</ref>
<ref id="B62">
<nlm-citation citation-type="">
<collab>UEP (United Egg Producers)</collab>
<source><![CDATA[Guidelines for Cage-Free Housing. United Egg Producers]]></source>
<year>2016</year>
</nlm-citation>
</ref>
<ref id="B63">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Van Den Brand]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Parmentier]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Kemp]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effects of housing system (outdoor vs cages) and age of laying hens on egg characteristics]]></article-title>
<source><![CDATA[British Poultry Science]]></source>
<year>2010</year>
<volume>45</volume>
<numero>6</numero>
<issue>6</issue>
<page-range>745-52</page-range></nlm-citation>
</ref>
<ref id="B64">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Yilmaz Dikmen]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Ípek]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Sahan]]></surname>
<given-names><![CDATA[U.]]></given-names>
</name>
<name>
<surname><![CDATA[Petek]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Sözcü]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The egg production and welfare of laying hens kept in different housing systems (conventional, enriched cage, and free range)]]></article-title>
<source><![CDATA[Poultry Science]]></source>
<year>2016</year>
<volume>96</volume>
<numero>7</numero>
<issue>7</issue>
<page-range>1564-72</page-range></nlm-citation>
</ref>
<ref id="B65">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Zaheer]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[An updated review on chicken eggs: production, consumption, management aspects and nutritional benefits to human health]]></article-title>
<source><![CDATA[Food and Nutrition Sciences]]></source>
<year>2015</year>
<volume>6</volume>
<numero>13</numero>
<issue>13</issue>
<page-range>1208-20</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
