<p><strong>Sodium et chlorure</strong></p>
<p style="text-align: justify;"><span id="result_box" lang="fr"><strong><span class="hps">Sodium</span> <span class="hps">et</span> <span class="hps">chlorure</span></strong> <span class="hps">sont sécrétés</span> <span class="hps">de manière intensive</span> <span class="hps">dans le tube digestif</span> <span class="hps alt-edited">avec la salive</span><span>,</span> <span class="hps">le suc pancréatique</span>, <span class="hps">et les sécrétions</span> <span class="hps">intestinales.</span> <span class="hps">Jusqu'à 99</span><span>% de la teneur</span> <span class="hps">de ces minéraux</span> <span class="hps alt-edited">est absorbée dans</span> <span class="alt-edited">le gros intestin</span><span>.</span> <span class="hps">L'intestin</span> <span class="hps">est pas un organe</span> <span class="hps">excréteur.</span> <span class="hps">Tout excédent</span> <span class="hps alt-edited">alimentaire en</span> <span class="hps alt-edited">sodium et en chlorure</span> <span class="hps">est</span> <span class="hps alt-edited">plutôt</span> <span class="hps">excrété dans l'urine</span>. <span class="hps alt-edited">Le potassium alimentaire</span> <span class="hps">traverse</span> <span class="hps">la paroi intestinale</span> <span class="hps">de l'intestin grêle</span> <span class="hps atn">(</span><span>65-70%</span>). <span class="hps">Dans le gros intestin</span><span>, le potassium</span> <span class="hps">peut</span> <span class="hps">aussi</span> <span class="hps">être</span> <span class="hps">absorbé par</span> <span class="hps">le contenu des intestins</span> <span class="hps">et</span> <span class="hps alt-edited">sécrété</span> <span class="hps alt-edited">du sang vers</span> <span class="hps alt-edited">le contenu intestinal</span>.</span></p>
<p style="text-align: justify;">&nbsp;</p>
<p style="text-align: justify;"><span id="result_box" lang="fr"><span class="hps">Le <strong>calcium</strong> est absorbé</span> <span class="hps">dans l'intestin grêle</span>. <span class="hps">L'efficacité</span> <span class="hps">du processus</span> <span class="hps">d'absorption</span> <span class="hps alt-edited">est régulé selon</span> <span class="hps">les</span> <span class="hps">besoins corporels</span> <span class="hps alt-edited">en calcium</span>. <span class="hps">L'absorption est</span> <span class="hps">élevée</span> <span class="hps">lorsque les pertes</span> <span class="hps alt-edited">en calcium</span> <span class="hps alt-edited">sont accrues</span><span>, comme</span> <span class="hps">pendant l'allaitement</span>, <span class="hps">ou quand</span> <span class="hps">la minéralisation osseuse</span> <span class="hps">nécessite</span> <span class="hps">de grandes quantités de</span> <span class="hps">calcium</span> <span class="hps">chez les jeunes</span> <span class="hps">chevaux en croissance</span><span>.</span> <span class="hps">L'absorption du calcium</span> <span class="hps">est stimulée par</span> <span class="hps">la vitamine D et</span> <span class="hps alt-edited">altérée par</span> <span class="hps">la carence en vitamine</span> <span class="hps">D</span><span>.</span></span></p>
<p><strong>&nbsp;</strong></p>
<p style="text-align: justify;"><span id="result_box" lang="fr"><span class="hps alt-edited">Le métabolisme</span> <span class="hps">de <strong>magnésium</strong> est</span> <span class="hps">beaucoup moins</span> <span class="hps">étroitement contrôlée</span> <span class="hps alt-edited">que</span> <span class="hps alt-edited">celui du calcium.</span> <span class="hps">Le magnésium</span> <span class="hps">est absorbé</span> <span class="hps">plus ou moins</span> <span class="hps alt-edited">proportionnellement</span> <span class="hps">à</span> <span class="hps">la teneur en magnésium</span> <span class="hps">dans l'alimentation.</span> <span class="hps alt-edited">Le surplus</span> <span class="hps">de magnésium</span> <span class="hps">est excrété</span> <span class="hps">par l'urine</span>.</span></p>
<p style="text-align: justify;">&nbsp;</p>
<p style="text-align: justify;"><span id="result_box" lang="fr"><span class="hps">Le <strong>phosphore</strong></span> <span class="hps alt-edited">est sécrété dans le</span> <span class="hps">tractus</span> <span class="hps">digestif</span> <span class="hps alt-edited">avec la salive</span> <span class="hps alt-edited">et autres</span> <span class="hps">sucs digestifs</span><span>.</span> <span class="hps">Dans</span> <span class="hps alt-edited">les rations riches</span> <span class="hps alt-edited">en</span> <span class="hps alt-edited">fourrages</span> <span class="hps">la sécrétion de</span> <span class="hps">phosphore avec</span> <span class="hps">les</span> <span class="hps">sucs digestifs</span> <span class="hps">peut dépasser</span> <span class="hps">l'apport alimentaire en</span> <span class="hps">phosphore.</span> <span class="hps">Dans de tels</span> <span class="hps">cas, c'</span><span class="hps">est d'abord dans</span> <span class="alt-edited">le gros intestin</span> <span class="hps alt-edited">qu'il y aura</span> <span class="hps">absorption nette</span> <span class="hps">de phosphore</span>. <span class="hps">Dans</span> <span class="hps alt-edited">les rations</span> <span class="hps">pauvres en fibres</span><span>,</span> <span class="hps alt-edited">la perte</span> <span class="hps">de sécrétion</span> <span class="hps">de</span> <span class="hps">phosphore</span> <span class="hps">dans l'intestin</span> <span class="hps alt-edited">est plus faible,</span> <span class="hps">et</span> <span class="hps">l'absorption nette</span> <span class="hps">a lieu dans</span> <span class="hps">l'intestin grêle.</span> <span class="hps">Le calcium est absorbé</span> <span class="hps">seulement</span> <span class="hps">dans l'intestin grêle</span><span>,</span> <span class="hps">tandis que</span> <span class="hps">le phosphore</span> <span class="hps alt-edited">peut être absorbé</span> <span class="hps">à la fois</span> <span class="hps">dans l'intestin grêle</span> <span class="hps">et</span> <span class="alt-edited">le gros intestin</span><span>.</span> Une teneur en <span class="hps">phosphore</span> <span class="hps">trop</span> <span class="hps">élevée</span> <span class="hps">par rapport à celle du</span><span class="hps"> calcium</span> <span class="hps">peut réduire</span> <span class="hps">l'absorption du calcium</span> <span class="hps">dans l'intestin grêle</span>, <span class="hps">et ainsi provoquer</span> <span class="hps">une carence <span id="result_box" lang="fr"><span class="hps">secondaire</span></span> en calcium</span><span>.</span> <span class="hps">Le phosphore est</span> <span class="hps">moins influencé</span> <span class="hps">par la teneur en</span> <span class="hps">calcium</span> <span class="hps">du régime alimentaire.</span></span></p>