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<p style="text-align: justify;"><strong>Les vitamines B sont un groupe de 8 vitamines hydrosolubles qui jouent un rôle important dans le métabolisme cellulaire. <span class="hps">Elles ne peuvent pas</span> <span class="hps">être produites par</span> <span class="hps">le</span> <span class="hps">corps lui-même</span>, <span class="hps">mais</span> <span class="hps">peuvent être produites par</span> <span class="hps">des bactéries, des</span> <span class="hps">champignons et des plantes</span>. <span class="hps">Chez le cheval</span>, <span class="hps">les micro-organismes</span> <span class="hps">dans l'intestin</span> <span class="hps">(</span>principalement <span class="hps">le </span><span class="alt-edited">gros intestin) sont</span> <span class="hps">capables de synthétiser</span> <span class="hps">des vitamines B</span> <span class="hps">et les</span> <span class="hps">besoins nutritionnels</span> <span class="hps">ont</span> <span class="hps">seulement</span> <span class="hps">été établis pour</span> <span class="hps">la thiamine</span> <span class="hps">(B1)</span> <span class="hps">et la riboflavine</span> <span class="hps">(B2). Les besoins indiqués dans PC-Horse ne doivent par conséquent n’être regardés que comme une ligne directrice.</span></strong></p>
<p style="text-align: justify;"><img style="display: block; margin-left: auto; margin-right: auto;" src="images-joomla/stories/seasons/vitamin-b6.jpg" alt="vitamin b6" /></p>
<p style="text-align: justify;"><strong>Fonction<br /></strong>La vitamine B<sub>6 </sub>participe à <span class="hps">effectue une</span> <span class="hps">extrêmement</span> <span class="hps">grande variété de fonctions</span> <span class="hps">dans le corps.</span> <span class="hps">Elle est impliquée</span> <span class="hps">dans de nombreuses réactions</span> <span class="hps">enzymatiques,</span> la <span class="hps">plupart avec les protéines, les glucides</span> <span class="hps">et</span> <span class="hps">le métabolisme des lipides</span>. <span class="hps">Elle est également</span> <span class="hps">un cofacteur</span> <span class="hps">dans la biosynthèse de</span> neuromédiateurs comme <span class="hps">l'</span>adrénaline et la noradrénaline.</p>
<p style="text-align: justify;"><strong>Sources alimentaires<br /></strong>La <span class="hps">vitamine</span> <span class="hps">B6</span> <span class="hps">englobe plusieurs</span> <span class="hps">formes chimiques</span> : <span class="hps">la pyridoxine</span>, le pyridoxal <span class="hps">et</span> <span class="hps">la pyridoxamine</span>. <span class="hps">Elles ont toutes</span> <span class="hps">une activité vitaminique</span> <span class="hps">égale</span> <span class="hps">sur une base molaire</span>. <span class="hps">La</span> <span class="hps">forme synthétique de</span> <span class="hps">pyridoxine</span> <span class="hps">utilisée pour</span> <span class="hps">la supplémentation alimentaire</span> <span class="hps">est</span> <span class="hps">le plus souvent</span> <span class="hps">le chlorhydrate</span> <span class="hps">de pyridoxine</span>. <span class="hps">La vitamine B6 est</span> <span class="hps">présente dans la plupart</span> <span class="hps">des aliments</span> <span class="hps">et</span> <span class="hps">elle est</span> <span class="hps">également</span>, comme indiqué, <span class="hps">produite par</span> <span class="hps">les micro-organismes</span> <span class="hps">dans les intestins.</span><br /> <span class="hps">Les concentrés</span> <span class="hps">sont généralement</span> <span class="hps">complétés par</span> <span class="hps">2-6</span> <span class="hps">mg de vitamine</span> <span class="hps">B6</span> <span class="hps">par kg</span> <span class="hps">de</span> <span class="hps">matière sèche</span>.</p>
<p style="text-align: justify;"><strong>Besoins<br /></strong><span class="hps">Basé</span> <span class="hps">sur la littérature</span> disponible <span class="hps">et les besoins</span> <span class="hps">indiqués pour</span> <span class="hps">les autres animaux domestiques</span>, <span class="hps">PC</span>-Horse <span class="hps">fournit</span> <span class="hps">les</span> <span class="hps">lignes directrices suivantes pour</span> <span class="hps">la vitamine B6</span> <span class="hps">dans les rations</span> <span class="hps">des chevaux</span>:</p>
<table style="border-collapse: collapse;" border="1" cellspacing="0" cellpadding="0">
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<td style="width: 120.25pt; border: 1pt solid windowtext; padding: 0cm 5.4pt;" valign="top" width="120">Entretien</td>
<td style="width: 134.65pt; border-width: 1pt 1pt 1pt medium; border-style: solid solid solid none; border-color: windowtext windowtext windowtext -moz-use-text-color; padding: 0cm 5.4pt;" valign="top" width="135">0.020 mg/kg poids corporel</td>
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<td style="width: 120.25pt; border-width: medium 1pt 1pt; border-style: none solid solid; border-color: -moz-use-text-color windowtext windowtext; padding: 0cm 5.4pt;" valign="top" width="120">Exercice léger</td>
<td style="width: 134.65pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0cm 5.4pt;" valign="top" width="135">0.020 mg/kg poids corporel</td>
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<td style="width: 120.25pt; border-width: medium 1pt 1pt; border-style: none solid solid; border-color: -moz-use-text-color windowtext windowtext; padding: 0cm 5.4pt;" valign="top" width="120">Exercice modéré</td>
<td style="width: 134.65pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0cm 5.4pt;" valign="top" width="135">0.022 mg/kg poids corporel</td>
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<td style="width: 120.25pt; border-width: medium 1pt 1pt; border-style: none solid solid; border-color: -moz-use-text-color windowtext windowtext; padding: 0cm 5.4pt;" valign="top" width="120">Exercice élevé</td>
<td style="width: 134.65pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0cm 5.4pt;" valign="top" width="135">0.026 mg/kg poids corporel</td>
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<td style="width: 120.25pt; border-width: medium 1pt 1pt; border-style: none solid solid; border-color: -moz-use-text-color windowtext windowtext; padding: 0cm 5.4pt;" valign="top" width="120">Exercice très élevé</td>
<td style="width: 134.65pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0cm 5.4pt;" valign="top" width="135">0.026 mg/kg poids corporel</td>
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<td style="width: 120.25pt; border-width: medium 1pt 1pt; border-style: none solid solid; border-color: -moz-use-text-color windowtext windowtext; padding: 0cm 5.4pt;" valign="top" width="120">Juments gestantes</td>
<td style="width: 134.65pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0cm 5.4pt;" valign="top" width="135">0.020 mg/kg poids corporel</td>
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<td style="width: 120.25pt; border-width: medium 1pt 1pt; border-style: none solid solid; border-color: -moz-use-text-color windowtext windowtext; padding: 0cm 5.4pt;" valign="top" width="120">Jument en lactation</td>
<td style="width: 134.65pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0cm 5.4pt;" valign="top" width="135">0.026 mg/kg poids corporel</td>
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<td style="width: 120.25pt; border-width: medium 1pt 1pt; border-style: none solid solid; border-color: -moz-use-text-color windowtext windowtext; padding: 0cm 5.4pt;" valign="top" width="120">Chevaux en croissance</td>
<td style="width: 134.65pt; border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; padding: 0cm 5.4pt;" valign="top" width="135">0.025 mg/kg poids corporel</td>
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<p style="text-align: justify;"><strong>Carence<br /></strong><span class="hps">Les symptômes de carence</span> <span class="hps">n’ont pas été rapportés</span> <span class="hps">chez les chevaux</span>.</p>
<p style="text-align: justify;"><strong>Toxicité<br /></strong><span class="hps">La vitamine B6</span> <span class="hps">étant une vitamine</span> <span class="hps">soluble dans l'eau</span>, l'excès de <span class="hps">consommation</span> <span class="hps">sera</span> <span class="hps">excrété dans l'urine</span>. <span class="hps">La toxicité de la vitamine B6</span> <span class="hps">chez le cheval</span> <span class="hps">n'a jamais été rapportée</span>.</p>
<p style="text-align: justify;"><strong>PC-Horse<br /></strong><span class="hps">PC</span><span class="atn">-</span>Horse <span class="hps">calcule</span> <span class="hps">des valeurs indicatives pour</span> <span class="hps">les apports en vitamine B6</span> <span class="hps">individuellement pour</span> <span class="hps">chaque cheval</span>. <span class="hps">Lorsque les valeurs</span> <span class="hps">peuvent être obtenues</span>, la B6 <span class="hps">est incluse dans les</span> <span class="hps">tables d'alimentation</span>. <span class="hps">Lors de la composition</span> <span class="hps">des rations</span> <span class="hps">avec</span> <span class="hps">PC</span><span class="atn">-</span>Cheval, <span class="hps">vous serez toujours</span> <span class="hps">en mesure de contrôler</span> <span class="hps">que la prise de</span> <span class="hps">vitamine B6</span> <span class="hps">est</span> <span class="hps">au moins suffisante pour</span> <span class="hps">se conformer aux</span> <span class="hps">lignes directrices proposées</span>.</p>
<p style="margin-top: 0.1pt; margin-right: 0cm; margin-bottom: 0.1pt; text-align: right;"><span style="color: #ff0000;"><strong><span class="short_text" lang="en"><span class="hps"></span><span class="hps"> <br /></span></span></strong></span></p>
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<p style="margin-top: 0.1pt; margin-right: 0cm; margin-bottom: 0.1pt;">&nbsp;</p>
<p style="margin-top: 0.1pt; margin-right: 0cm; margin-bottom: 0.1pt;"><em>This article was originally written by Dr. Day Austbø.</em><br /> <em>Copyright: PC-Horse International - Norway 2015</em><br /> <em>Feel free to use and publish the material. Please indicate the source and author.</em></p>