<?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>1405-3195</journal-id>
<journal-title><![CDATA[Agrociencia]]></journal-title>
<abbrev-journal-title><![CDATA[Agrociencia]]></abbrev-journal-title>
<issn>1405-3195</issn>
<publisher>
<publisher-name><![CDATA[Colegio de Postgraduados]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-31952018000400511</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Concentraciones de selenio que inhiben la actividad microbiana ruminal durante la fermentación in vitro de heno de avena]]></article-title>
<article-title xml:lang="en"><![CDATA[Inhibitory effect of selenium concentrations on microbial activity during oat hay in vitro rumen fermentation]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Almaraz-Buendía]]></surname>
<given-names><![CDATA[Isaac]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Razo-Rodríguez]]></surname>
<given-names><![CDATA[O. Enrique Del]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Salinas-Martínez]]></surname>
<given-names><![CDATA[J. Armando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Campos-Montiel]]></surname>
<given-names><![CDATA[Rafael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Bribiesca]]></surname>
<given-names><![CDATA[Efrén]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma del Estado de Hidalgo Instituto de Ciencias Agropecuarias ]]></institution>
<addr-line><![CDATA[Tulancingo Hidalgo]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Colegio de Postgraduados Campus Montecillo ]]></institution>
<addr-line><![CDATA[Montecillo Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2018</year>
</pub-date>
<volume>52</volume>
<numero>4</numero>
<fpage>511</fpage>
<lpage>521</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952018000400511&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952018000400511&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952018000400511&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El selenio (Se) se ha suministrado a rumiantes en concentraciones superiores a la establecida como máxima tolerable, pero su efecto en la fermentación ruminal se ha documentado poco. El objetivo de este estudio fue evaluar el efecto de Se adicionado en la fermentación in vitro de heno de avena. Los tratamientos fueron: testigo, Se20, Se40, Se60 y Se80 correspondientes a 0, 20, 40, 60 y 80 mg Se kg-1 MS en el sustrato, como selenito de sodio. La incubación de 500 mg de heno se realizó con 40 mL de medio de cultivo (líquido ruminal, soluciones minerales, solución amortiguadora, resazurina y solución reductora) a 39 °C por 72 h, con la técnica de producción de gas. Las variables fueron: volumen de gas acumulado (VAG), cinética de producción de gas (volumen máximo (V), tasa de producción de gas (S) y tiempo de retardo (L)), metano (CH4), pH, degradación de la materia seca (DMS), ácidos grasos volátiles (AGV) y nitrógeno amoniacal (N-NH3). El diseño experimental fue completamente al azar con medidas repetidas, con siete repeticiones independientes por tratamiento y los datos se analizaron con el procedimiento MIXED de SAS®. Cuando el heno se fermentó con Se60 y Se80 el pH fue mayor y VAG, V, S y CH4 fueron menores respecto a los otros tratamientos (p &#8804; 0.05). El Se adicionado no afectó DMS, AGV y N-NH3 (p &gt; 0.05), pero estas variables disminuyeron linealmente con la concentración mayor del microelemento (p &#8804; 0.05). La actividad microbiana durante la fermentación in vitro de heno de avena se mantuvo constante con 20 y 40 mg Se kg-1 MS, y la última concentración puede ser el límite máximo que garantice la fermentación in vitro apropiada.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Selenium (Se) has been supplied to ruminants in concentrations higher than that of their established tolerable maximum, but its effects on the ruminal fermentation are scarcely documented. Our objective of this study was to evaluate the effect of Se added to in vitro fermentation of oats hay. The treatments were: control, Se20, Se40, Se60 and Se80 which correspond to 0, 20, 40, 60 and 80 mg Se kg-1 MS sodium selenite in the substrate. Oat hay samples (500 mg) were incubated with 40 mL of culture media (rumen fluid, mineral solutions, buffer solution, resazurin and reducing solution) at 39 °C for 72 h, using the gas production technique. The evaluated variables were: accumulated gas volume (AGV), gas production kinetics (maximum volume (V), gas production rate (S) and delay time (L)), methane (CH4), pH, degradation of dry matter (DMS), volatile fatty acids (VFA) and ammoniacal nitrogen (N-NH3). The completely randomized experimental design with repeated measures had seven independent repetitions per treatment. The data were analyzed with the MIXED procedure in the SAS® software. Oat hay fermented with Se60 and Se80 had higher pH and lower AGV, V, S, and CH4 compared to the other treatments (p &#8804; 0.05). Se addition did not affect DMS, VFA or N-NH3 (p &gt; 0.05), but these variables linearly decreased with the highest microelement concentrations (p &#8804; 0.05). The microbial activity during the in vitro fermentation of oat hay kept constant with 20 and 40 mg Se kg-1 MS; the last concentration may be the maximum limit that guarantees the appropriate in vitro fermentation.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[selenito de sodio]]></kwd>
<kwd lng="es"><![CDATA[degradación]]></kwd>
<kwd lng="es"><![CDATA[producción de gas]]></kwd>
<kwd lng="es"><![CDATA[metano]]></kwd>
<kwd lng="es"><![CDATA[ácidos grasos volátiles]]></kwd>
<kwd lng="es"><![CDATA[nitrógeno amoniacal]]></kwd>
<kwd lng="en"><![CDATA[sodium selenite]]></kwd>
<kwd lng="en"><![CDATA[degradation]]></kwd>
<kwd lng="en"><![CDATA[gas production]]></kwd>
<kwd lng="en"><![CDATA[methane]]></kwd>
<kwd lng="en"><![CDATA[volatile fatty acids]]></kwd>
<kwd lng="en"><![CDATA[ammonia nitrogen]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cristaldi]]></surname>
<given-names><![CDATA[L. A.]]></given-names>
</name>
<name>
<surname><![CDATA[McDowell]]></surname>
<given-names><![CDATA[L. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Buergelt]]></surname>
<given-names><![CDATA[C. D.]]></given-names>
</name>
<name>
<surname><![CDATA[Davis]]></surname>
<given-names><![CDATA[P. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Wilkinson]]></surname>
<given-names><![CDATA[N. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Martin]]></surname>
<given-names><![CDATA[F. G.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Tolerance of inorganic selenium in wether sheep]]></article-title>
<source><![CDATA[Small Ruminant Res.]]></source>
<year>2005</year>
<volume>56</volume>
<page-range>205-13</page-range></nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Datt]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Kumar]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Kundu]]></surname>
<given-names><![CDATA[S. S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effect of different levels of added selenium without or with arsenic on rumen fermentation parameters in buffaloes under in vitro conditions]]></article-title>
<source><![CDATA[Indian J. Anim Sci.]]></source>
<year>2013</year>
<volume>83</volume>
<page-range>1203-6</page-range></nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Davis]]></surname>
<given-names><![CDATA[P. A.]]></given-names>
</name>
<name>
<surname><![CDATA[McDowell]]></surname>
<given-names><![CDATA[L. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Wilkinson]]></surname>
<given-names><![CDATA[N. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Buergelt]]></surname>
<given-names><![CDATA[C. D.]]></given-names>
</name>
<name>
<surname><![CDATA[Alstyne]]></surname>
<given-names><![CDATA[R. Van]]></given-names>
</name>
<name>
<surname><![CDATA[Weldon]]></surname>
<given-names><![CDATA[R. N.]]></given-names>
</name>
<name>
<surname><![CDATA[Marshall]]></surname>
<given-names><![CDATA[T. T.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effects of selenium levels in ewe diets on selenium in milk and the plasma and tissue selenium concentrations of lambs]]></article-title>
<source><![CDATA[Small Ruminant Res.]]></source>
<year>2006</year>
<volume>65</volume>
<page-range>14-23</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Davis]]></surname>
<given-names><![CDATA[P. A.]]></given-names>
</name>
<name>
<surname><![CDATA[McDowell]]></surname>
<given-names><![CDATA[L. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Wilkinson]]></surname>
<given-names><![CDATA[N. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Buergelt]]></surname>
<given-names><![CDATA[C. D.]]></given-names>
</name>
<name>
<surname><![CDATA[Alstyne]]></surname>
<given-names><![CDATA[R. Van]]></given-names>
</name>
<name>
<surname><![CDATA[Weldon]]></surname>
<given-names><![CDATA[R. N.]]></given-names>
</name>
<name>
<surname><![CDATA[Marshall]]></surname>
<given-names><![CDATA[T. T.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Tolerance of inorganic selenium by range-type ewes during gestation and lactation]]></article-title>
<source><![CDATA[J. Anim. Sci.]]></source>
<year>2006</year>
<volume>84</volume>
<page-range>660-8</page-range></nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Davis]]></surname>
<given-names><![CDATA[P. A.]]></given-names>
</name>
<name>
<surname><![CDATA[McDowell]]></surname>
<given-names><![CDATA[L. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Wilkinson]]></surname>
<given-names><![CDATA[N. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Buergelt]]></surname>
<given-names><![CDATA[C. D.]]></given-names>
</name>
<name>
<surname><![CDATA[Alstyne]]></surname>
<given-names><![CDATA[R. Van]]></given-names>
</name>
<name>
<surname><![CDATA[Weldon]]></surname>
<given-names><![CDATA[R. N.]]></given-names>
</name>
<name>
<surname><![CDATA[Marshall]]></surname>
<given-names><![CDATA[T. T.]]></given-names>
</name>
<name>
<surname><![CDATA[Matsuda-Fugisaki]]></surname>
<given-names><![CDATA[E. Y.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Comparative effects of various dietary levels of Se as sodium selenite or Se yeast on blood, wool, and tissue Se concentrations of wether sheep]]></article-title>
<source><![CDATA[Small Ruminant Res.]]></source>
<year>2008</year>
<volume>74</volume>
<page-range>149-58</page-range></nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Del Razo-Rodriguez]]></surname>
<given-names><![CDATA[O. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Ramirez-Bribiesca]]></surname>
<given-names><![CDATA[J. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Lopez-Arellano]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Revilla-Vazquez]]></surname>
<given-names><![CDATA[A. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Gonzalez-Munoz]]></surname>
<given-names><![CDATA[S. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Cobos-Peralta]]></surname>
<given-names><![CDATA[M. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Hernandez-Calva]]></surname>
<given-names><![CDATA[L. M.]]></given-names>
</name>
<name>
<surname><![CDATA[McDowell]]></surname>
<given-names><![CDATA[L. R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effects of dietary level of selenium and grain on digestive metabolism in lambs]]></article-title>
<source><![CDATA[Czech J. Anim. Sci.]]></source>
<year>2013</year>
<volume>58</volume>
<page-range>253-61</page-range></nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="journal">
<collab>DOF</collab>
<article-title xml:lang=""><![CDATA[Norma Oficial Mexicana NOM-062-ZOO-1999, especificaciones técnicas para la producción, cuidado y uso de los animales de laboratorio]]></article-title>
<source><![CDATA[Diario Oficial de la Federación]]></source>
<year>2001</year>
<page-range>107</page-range></nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Erwin]]></surname>
<given-names><![CDATA[E. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Marco]]></surname>
<given-names><![CDATA[G. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Emery]]></surname>
<given-names><![CDATA[E. M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Volatile fatty acid analyses of blood and rumen fluid by gas chromatography]]></article-title>
<source><![CDATA[J. Dairy Sci.]]></source>
<year>1961</year>
<volume>44</volume>
<page-range>1768-71</page-range></nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Eun]]></surname>
<given-names><![CDATA[J. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Davis]]></surname>
<given-names><![CDATA[T. Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Vera]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Miller]]></surname>
<given-names><![CDATA[D. N.]]></given-names>
</name>
<name>
<surname><![CDATA[Panter]]></surname>
<given-names><![CDATA[K. E.]]></given-names>
</name>
<name>
<surname><![CDATA[ZoBell]]></surname>
<given-names><![CDATA[D. R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Addition of high concentration of inorganic selenium in orchardgrass (Dactylis glomerata L.) hay diet does not interfere with microbial fermentation in mixed ruminal microorganisms in continuous cultures]]></article-title>
<source><![CDATA[PAS]]></source>
<year>2013</year>
<volume>29</volume>
<page-range>39-45</page-range></nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Getachew]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Robinson]]></surname>
<given-names><![CDATA[P. H.]]></given-names>
</name>
<name>
<surname><![CDATA[DePeters]]></surname>
<given-names><![CDATA[E. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Taylor]]></surname>
<given-names><![CDATA[S. J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Relationships between chemical composition, dry matter degradation and in vitro gas production of several ruminant feeds]]></article-title>
<source><![CDATA[Anim. Feed Sci. Tech.]]></source>
<year>2004</year>
<volume>111</volume>
<page-range>57-71</page-range></nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Glass]]></surname>
<given-names><![CDATA[J. B.]]></given-names>
</name>
<name>
<surname><![CDATA[Orphan]]></surname>
<given-names><![CDATA[V. J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Trace metal requirements for microbial enzymes involved in the production and consumption of methane and nitrous oxide]]></article-title>
<source><![CDATA[Front. Microbiol.]]></source>
<year>2012</year>
<volume>3</volume>
<page-range>1-20</page-range></nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hefnawy]]></surname>
<given-names><![CDATA[A. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Tórtora-Pérez]]></surname>
<given-names><![CDATA[J. L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The importance of selenium and the effects of its deficiency in animal health]]></article-title>
<source><![CDATA[Small Ruminant Res.]]></source>
<year>2010</year>
<volume>89</volume>
<page-range>185-92</page-range></nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hernández-Calva]]></surname>
<given-names><![CDATA[L. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Ramírez-Bribiesca]]></surname>
<given-names><![CDATA[J. E.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Diagnosis of selenium status and sodium selenite injection in fighting cattle on the Mexican plateau]]></article-title>
<source><![CDATA[Cuban J. Agr. Sci.]]></source>
<year>2006</year>
<volume>40</volume>
<page-range>43-6</page-range></nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hill]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[McSweeney]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Wright]]></surname>
<given-names><![CDATA[A. D. G.]]></given-names>
</name>
<name>
<surname><![CDATA[Bishop-Hurley]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Kalantar-zadeh]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Measuring methane production from ruminants]]></article-title>
<source><![CDATA[Trends Biotechnol.]]></source>
<year>2016</year>
<volume>34</volume>
<page-range>26-35</page-range></nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kim]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Van Soest]]></surname>
<given-names><![CDATA[P. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Combs]]></surname>
<given-names><![CDATA[G. F.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Studies on the effects of selenium on rumen microbial fermentation in vitro]]></article-title>
<source><![CDATA[Biol. Trace Elem. Res.]]></source>
<year>1997</year>
<volume>56</volume>
<page-range>203-13</page-range></nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mainville]]></surname>
<given-names><![CDATA[A. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Odongo]]></surname>
<given-names><![CDATA[N. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Bettger]]></surname>
<given-names><![CDATA[W. J.]]></given-names>
</name>
<name>
<surname><![CDATA[McBride]]></surname>
<given-names><![CDATA[B. W.]]></given-names>
</name>
<name>
<surname><![CDATA[Osborne]]></surname>
<given-names><![CDATA[V. R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Selenium uptake by ruminal microorganisms from organic and inorganic sources in dairy cows]]></article-title>
<source><![CDATA[Can. J. Anim. Sci.]]></source>
<year>2009</year>
<volume>89</volume>
<page-range>105-10</page-range></nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Nancharaiah]]></surname>
<given-names><![CDATA[Y. V.]]></given-names>
</name>
<name>
<surname><![CDATA[Lens]]></surname>
<given-names><![CDATA[P. N. L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Ecology and biotechnology of selenium-respiring bacteria]]></article-title>
<source><![CDATA[Microbiol. Mol. Biol. Rev.]]></source>
<year>2015</year>
<volume>79</volume>
<page-range>61-80</page-range></nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="book">
<collab>National Academies of Sciences, Engineering, and Medicine</collab>
<source><![CDATA[Nutrient Requirements of Beef Cattle]]></source>
<year>2016</year>
<edition>8th</edition>
<publisher-loc><![CDATA[Washington, DC ]]></publisher-loc>
<publisher-name><![CDATA[The National Academy Press]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="book">
<collab>National Research Council</collab>
<source><![CDATA[Nutrient Requirements of Dairy Cattle]]></source>
<year>2001</year>
<edition>7th</edition>
<publisher-loc><![CDATA[Washington, DC ]]></publisher-loc>
<publisher-name><![CDATA[National Academy Press]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="book">
<collab>National Research Council</collab>
<source><![CDATA[Mineral Tolerance of Animals]]></source>
<year>2005</year>
<edition>2nd</edition>
<publisher-loc><![CDATA[Washington, DC ]]></publisher-loc>
<publisher-name><![CDATA[National Academy Press]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="book">
<collab>National Research Council</collab>
<source><![CDATA[Nutrient Requirements of Small Ruminants: Sheep, Goats, Cervids and New World Camelids]]></source>
<year>2007</year>
<publisher-loc><![CDATA[Washington, DC ]]></publisher-loc>
<publisher-name><![CDATA[National Academy Press]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Panev]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Hauptmanová]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Pavlata]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Pechová]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Filípek]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Dvo&#345;ák]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effect of supplementation of various selenium forms and doses on selected parameters of ruminal fluid and blood in sheep]]></article-title>
<source><![CDATA[Czech J. Anim. Sci.]]></source>
<year>2013</year>
<volume>58</volume>
<page-range>37-46</page-range></nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ramírez-Bribiesca]]></surname>
<given-names><![CDATA[J. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Tórtora]]></surname>
<given-names><![CDATA[J. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Hernández]]></surname>
<given-names><![CDATA[L. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Huerta]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Main causes of mortalities in dairy goat kids from the Mexican plateau]]></article-title>
<source><![CDATA[Small Ruminant Res.]]></source>
<year>2001</year>
<volume>41</volume>
<page-range>77-80</page-range></nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ramírez-Bribiesca]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Hernández-Camacho]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Hernández-Calva]]></surname>
<given-names><![CDATA[L. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Tórtora-Pérez]]></surname>
<given-names><![CDATA[J. L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Efecto de un suplemento parenteral con selenito de sodio en la mortalidad de corderos y los valores hemáticos de selenio]]></article-title>
<source><![CDATA[Agrociencia]]></source>
<year>2004</year>
<volume>38</volume>
<page-range>43-51</page-range></nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ramirez-Bribiesca]]></surname>
<given-names><![CDATA[J. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Wang]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Jin]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Canam]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Town]]></surname>
<given-names><![CDATA[J. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Tsang]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Dumonceaux]]></surname>
<given-names><![CDATA[T. J.]]></given-names>
</name>
<name>
<surname><![CDATA[McAllister]]></surname>
<given-names><![CDATA[T. A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Chemical characterization and in vitro fermentation of Brassica straw treated with the aerobic fungus, Trametes versicolor]]></article-title>
<source><![CDATA[Can. J. Anim. Sci.]]></source>
<year>2011</year>
<volume>91</volume>
<page-range>695-702</page-range></nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Revilla-Vázquez]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Ramírez-Bribiesca]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[López-Arellano]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Hernández-Calva]]></surname>
<given-names><![CDATA[L. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Tórtora-Pérez]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[García-García]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Cruz-Monterrosa]]></surname>
<given-names><![CDATA[R. G.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Suplemento de selenio con bolos intrarruminales de selenito de sodio en ovinos]]></article-title>
<source><![CDATA[Agrociencia]]></source>
<year>2008</year>
<volume>42</volume>
<page-range>629-35</page-range></nlm-citation>
</ref>
<ref id="B27">
<nlm-citation citation-type="book">
<collab>SAS Institute Inc</collab>
<source><![CDATA[SAS/STAT® 12.1 User's Guide]]></source>
<year>2012</year>
<publisher-loc><![CDATA[Cary, NC, USA ]]></publisher-loc>
<publisher-name><![CDATA[SAS Institute Inc.]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B28">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Schofield]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Pitt]]></surname>
<given-names><![CDATA[R. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Pell]]></surname>
<given-names><![CDATA[A. N.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Kinetics of fiber digestion from in vitro gas production]]></article-title>
<source><![CDATA[J. Anim. Sci.]]></source>
<year>1994</year>
<volume>72</volume>
<page-range>2980-91</page-range></nlm-citation>
</ref>
<ref id="B29">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Schofield]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Pell]]></surname>
<given-names><![CDATA[A. N.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Validity of using accumulated gas pressure readings to measure forage digestion in vitro: a comparison involving three forages]]></article-title>
<source><![CDATA[J. Dairy Sci.]]></source>
<year>1995</year>
<volume>78</volume>
<page-range>2230-8</page-range></nlm-citation>
</ref>
<ref id="B30">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Serra]]></surname>
<given-names><![CDATA[A. B.]]></given-names>
</name>
<name>
<surname><![CDATA[Nakamura]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Matsui]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Harumoto]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Fujihara]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Inorganic selenium for sheep II. Its influence on rumen bacterial yield, volatile fatty acid production and total tract digestion of timothy hay]]></article-title>
<source><![CDATA[Asian-Australas. J. Anim. Sci.]]></source>
<year>1994</year>
<volume>7</volume>
<page-range>91-6</page-range></nlm-citation>
</ref>
<ref id="B31">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Stock]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Rother]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Selenoproteins in Archaea and Gram-positive bacteria]]></article-title>
<source><![CDATA[BBA-Gen. Subjects]]></source>
<year>2009</year>
<volume>1790</volume>
<page-range>1520-32</page-range></nlm-citation>
</ref>
<ref id="B32">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Theodorou]]></surname>
<given-names><![CDATA[M. K.]]></given-names>
</name>
<name>
<surname><![CDATA[Williams]]></surname>
<given-names><![CDATA[B. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Dhanoa]]></surname>
<given-names><![CDATA[M. S.]]></given-names>
</name>
<name>
<surname><![CDATA[McAllan]]></surname>
<given-names><![CDATA[A. B.]]></given-names>
</name>
<name>
<surname><![CDATA[France]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[A simple gas production method using a pressure transducer to determine the fermentation kinetics of ruminant feeds]]></article-title>
<source><![CDATA[Anim. Feed Sci. Tech.]]></source>
<year>1994</year>
<volume>48</volume>
<page-range>185-97</page-range></nlm-citation>
</ref>
<ref id="B33">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Weatherburn]]></surname>
<given-names><![CDATA[M. W.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Phenol-hypochlorite reaction for determination of ammonia]]></article-title>
<source><![CDATA[Anal. Chem.]]></source>
<year>1967</year>
<volume>39</volume>
<page-range>971-4</page-range></nlm-citation>
</ref>
<ref id="B34">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Xun]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Shi]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Yue]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Zhang]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Ren]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Liu]]></surname>
<given-names><![CDATA[Q.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effect of high-dose nano-selenium and selenium-yeast on feed digestibility, rumen fermentation, and purine derivatives in sheep]]></article-title>
<source><![CDATA[Biol. Trace Elem. Res.]]></source>
<year>2012</year>
<volume>150</volume>
<page-range>130-6</page-range></nlm-citation>
</ref>
<ref id="B35">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Yang]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Rooke]]></surname>
<given-names><![CDATA[J. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Cabeza]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Wallace]]></surname>
<given-names><![CDATA[R. J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Nitrate and inhibition of ruminal methanogenesis: microbial ecology, obstacles, and opportunities for lowering methane emissions from ruminant livestock]]></article-title>
<source><![CDATA[Front. Microbiol.]]></source>
<year>2016</year>
<volume>7</volume>
<page-range>1-14</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
