<p><img src="images/Mg.jpg" alt="" /></p>
<p style="text-align: justify;"><span id="result_box" lang="fr"><span class="hps">Le corps du</span> <span class="hps">cheval</span> <span class="hps">contient environ</span> <span class="hps">0,05</span><span>% de magnésium</span>, <span class="hps">60</span><span class="alt-edited">% de celui-ci</span> <span class="hps alt-edited">se trouvant dans le</span> <span class="hps">squelette</span>. <span class="hps">Le magnésium est un</span> <span class="hps">activateur</span> <span class="hps">de</span> <span class="hps">nombreuses enzymes</span> <span class="hps">et est nécessaire pour</span> <span class="hps alt-edited">une fonction musculaire</span> <span class="hps alt-edited">normale.</span> <span class="hps alt-edited">L'absorption</span> <span class="hps">normale</span> <span class="hps alt-edited">du</span> <span class="hps">magnésium</span> <span class="hps">est</span> <span class="hps">de 40 à 60</span><span>%.</span> <span class="hps alt-edited">Pour</span> <span class="hps alt-edited">calcul des besoins</span> <span class="hps alt-edited">en magnésium</span> <span class="hps">une valeur</span> <span class="hps">d'absorption de</span> <span class="hps">40</span>% <span class="hps alt-edited">a été retenue</span> <span class="hps">(NRC</span> <span class="hps">1989)</span><span>.</span></span></p>
<p><strong>Entretien</strong>. Mg (g/j) = 0.015*PC </p>
<p style="text-align: justify;"><strong>Croissance</strong> : entre 0.85 et 1.25 g de Mg sont déposés par kg de gain de poids corporel ; NRC retient 1.25 g dans leurs calculs. <br />Mg (g/j) = 0.015*PC + 1.25*GJP <br /><br />Besoin en magnésium pour la croissance avec travail :<br />Mg (g/j) =(0.015*PC+1.25*GPJ)* (ED pour exercice / ED sans exercice) <br /><br /><strong>Gestation </strong>: les besoins en magnésium au cours des 3 derniers mois de gestation augmentent de 0.3 mg/kg PC. <br />Mois 9 - 11: Mg (g/j) = 2.0 * ED (MJ) <br /><br /><strong>Lactation. </strong><span id="result_box" lang="fr"><span class="hps">La concentration</span> <span class="hps alt-edited">en magnésium</span> <span class="hps">dans le lait</span> <span class="hps">de jument</span> <span class="hps">en début de lactation</span> <span class="hps">est d'environ 90</span> <span class="hps">mg</span> <span class="hps">/</span> <span class="hps">kg</span> <span class="hps alt-edited">puis diminue à</span> <span class="hps">45</span> <span class="hps">mg / kg</span> <span class="hps">en fin de lactation</span>. <span class="hps">L'absorption du</span> <span class="hps">magnésium</span> <span class="hps alt-edited">est supposée être</span> <span class="hps">40</span>%.</span><br /><br />1er - 2ème mois : <br />Jument 200 kg: Mg (g/j) =0.015*PC + (0.04*PC*0.09) /0.4 <br />Jument de plus de 300 kg: Mg (g/j) =0.015*PC + (0.03*PC*0.09) /0.4 <br /><br />3ème mis - sevrage : <br />Jument 200 kg: Mg (g/j) =0.015*PC + (0.03*PC*0.045)/ 0.4 <br />Jument de plus de 300 kg: Mg (g/j) =0.015*PC + (0.02*PC*0.045)/ 0.4 <br /><br /><strong>Travail </strong>: Mg (g/j)= 1.92 * ED (MJ)</p>