<p><img src="images/P.jpg" alt="" /></p>
<p style="text-align: justify;"><span id="result_box" lang="fr"><span class="hps">Le phosphore est</span> <span class="hps">nécessaire pour la croissance</span> <span class="hps">du</span> <span class="hps">squelette</span> <span class="hps atn">(</span><span>le</span> <span class="hps">squelette</span> <span class="hps">comprend</span> <span class="hps">14 à 17</span><span>% de phosphore</span><span>)</span> <span class="hps">et</span> <span class="hps">pour</span> <span class="hps">le</span> <span class="hps">métabolisme</span> <span class="hps">de l'énergie dans</span> <span class="hps">les</span> <span class="hps">cellules du corps</span>. <span class="hps">Trop de phosphore</span> <span class="hps alt-edited">réduira l'absorption</span> <span class="hps">du calcium et</span> <span class="hps alt-edited">pourrait</span> <span class="hps">par conséquent</span> <span class="hps">conduire à des anomalies</span> <span class="hps">squelettiques</span><span>.</span> <span class="hps alt-edited">L'excès de phosphore</span> <span class="hps alt-edited">peut</span> <span class="hps">également nuire à</span> <span class="hps">l'absorption du fer</span><span>.</span></span></p>
<p style="text-align: justify;"><strong><br />Entretien :&nbsp;</strong><span id="result_box" lang="fr"><span class="hps">Les</span> <span class="hps">besoins en phosphore</span> <span class="hps">sont calculés sur la</span> <span class="hps">base d'une</span> <span class="hps">perte</span> <span class="hps">endogène</span> <span class="hps">de</span> <span class="hps">10</span> <span class="hps">mg /</span> <span class="hps alt-edited">kg de poids corporel (PC)</span> <span class="hps">et</span> <span class="hps">35</span>% d'absorption.</span> <br /><br />P (g/j) = 0.28*PC <br /><br /><strong>Croissance : </strong><span id="result_box" lang="fr"><span class="hps">Le besoin en</span> <span class="hps">phosphore</span> <span class="hps">est d'environ</span> <span class="hps">8</span> <span class="hps">g /</span> <span class="hps">kg</span> <span class="hps">de</span> <span class="hps">gain de poids.</span> <span class="hps">Chez les jeunes</span> <span class="hps">chevaux</span> <span class="hps">pour qui</span> <span class="hps alt-edited">les aliments</span> <span class="hps">contiennent</span> <span id="result_box" lang="fr"><span class="hps alt-edited">habituellement</span></span> <span class="hps alt-edited">du phosphore inorganique ajouté</span><span>, il est</span> <span class="hps">courant de supposer</span> <span class="hps">une efficacité</span> <span class="hps">d'absorption</span> <span class="hps">de 45%</span><span>.</span></span><br /><br />P (g/j) = 0.022*PC + 17.8*GPJ </p>
<p style="text-align: justify;"><span id="result_box" lang="fr"><span class="hps">Pour les jeunes</span> <span class="hps">chevaux à l'entraînement</span> <span class="hps alt-edited">les besoins</span> <span class="hps alt-edited">en phosphore</span> <span class="hps">de la croissance</span> <span class="hps alt-edited">sont ajoutés à</span> <span class="hps alt-edited">ceux du travail</span> <span class="hps alt-edited">quisont&nbsp; déterminés par rapport à</span> <span class="hps">l'énergie requise</span> <span class="hps alt-edited">pour le travail.</span></span></p>
<p style="text-align: justify;"><br />P =(0.022*PC+17.8*GPJ)*(ED pour les chevaux au travail / ED pour les chevaux non travaillés) <br /><br /><span id="result_box" lang="fr"><strong><span class="hps alt-edited">Gestation</span></strong><span class="alt-edited"> :</span> <span class="hps">Pendant les</span> <span class="hps">trois derniers mois de</span> <span class="hps alt-edited">la gestation, la</span> <span class="hps">formule suivante est utilisée</span><span class="alt-edited"> :</span></span><br /><br />P (g/j) = 6.0 * ED (MJ) <br /><strong><br /></strong></p>
<p style="text-align: justify;"><span id="result_box" lang="fr"><strong><span class="hps">Production de lait</span></strong><span class="alt-edited"> :</span> <span class="hps">La teneur en phosphore</span> <span class="hps alt-edited">du</span> <span class="hps">lait de jument</span> <span class="hps">varie entre</span> <span class="hps">0,75 g /</span> <span class="hps">kg</span> <span class="hps">en début de lactation</span> <span class="hps">et 0,5</span> <span class="hps">g / kg</span> <span class="hps">en fin de lactation</span>. <span class="hps alt-edited">L'absorption du</span> <span class="hps">phosphore</span> <span class="hps">au cours de</span> <span class="hps">la lactation</span> <span class="hps alt-edited">est supposée être de</span> <span class="hps">45</span>%. <span class="hps alt-edited">Les juments</span> <span class="hps">en début de lactation</span> <span class="hps">produisant</span> <span class="hps">16 kg</span> <span class="hps">/ j</span> <span class="hps">de lait</span> <span class="hps">exigent</span> <span class="hps">1,67</span> <span class="hps">*</span> <span class="hps">16</span> <span class="hps">=</span> <span class="hps">26,7</span> <span class="hps">g de phosphore</span> <span class="hps">pour la production</span> <span class="hps">de lait</span> <span class="hps atn">(</span><span class="alt-edited">en plus de</span> <span class="hps">ce qui est nécessaire</span> <span class="hps">pour l'entretien</span>).</span></p>
<p style="text-align: justify;"><br />1er-2ème mois de lactation : <br /><br />Jument 200 kg: P (g/j) =0.01*PC + (0.04*PC*0.75)/ 0.45 <br />Jument de plus de 300 kg: P (g/j) =0.01*PC + (0.03*PC*0.75)/ 0.45 <br /><br />3ème mois de lactation au sevrage : <br /><br />Jument 200 kg: P (g/j) =0.01*PC + (0.03*PC*0.50) /0.45 <br />Jument de plus de 300 kg: P (g/j) = 0.01*PC + (0.02*PC*0.50)/ 0.45 <br /><br /><span id="result_box" lang="fr"><span class="hps alt-edited"><strong>Travail</strong> :</span> <span class="hps alt-edited">Le besoin</span> <span class="hps alt-edited">en phosphore</span> <span class="hps alt-edited">des chevaux au</span> <span class="hps">le travail est lié</span> <span class="hps">à l'exigence</span> <span class="hps alt-edited">en énergie</span> <span class="hps alt-edited">:</span></span>&nbsp;<br /><br />P (g/j) = 3.64 * ED (MJ) <em><br /></em></p>