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Accueil Toutes les actualités agricoles Quel maïs fourrage pour optimiser la marge de son élevage bovin ? Quel maïs fourrage pour optimiser la marge de son élevage bovin ? ©MadMax Studio - Maxime Guigue Le coût alimentaire des élevages bovins représente pas moins de 30 à 35 % des charges de production de l’exploitation. Une ration de base de haute valeur alimentaire permet de limiter l’achat d’aliments concentrés, dont les coûts n’ont cessé d’augmenter ces derniers mois, et ainsi d’être plus autonome tout en s'assurant une meilleure marge. À noter que le fourrage qui apporte le plus d'énergie et de fibres nécessaires à la rumination des vaches est le maïs ensilage. Et une part importante de la composition de la ration des vaches est constituée de ce maïs : entre 30 et 60 % de la ration moyenne du troupeau selon les régions et types d’élevage.
Étant majoritairement produites sur l’exploitation, il est primordial de sélectionner des variétés de maïs fourrage assurant un haut niveau de rendement, mais surtout une excellente valeur alimentaire afin qu’elles soient bien valorisées par les vaches pour assurer une production laitière ou viande élevée.
©MadMax Studio - Maxime Guigue Bien que le rendement soit un critère de choix majeur pour choisir ses variétés, leurs qualités agronomiques et valeurs alimentaires le sont également.
Les critères de valeurs alimentaires à comparer pour faire son choix variétal : • Dinag : cet index, mis au point par l’INRA, est une valeur de référence permettant de calculer la digestibilité de la partie tige et feuille sur le maïs en vert.
• UFL : Unité Fourragère Laitière, utilisé également par l’INRA pour déterminer la valeur énergétique d’un fourrage, sa teneur en énergie.
• MAT (Matière Azotée Totale) ou « protéines brutes » : correspond à l’assimilation de l’azote par le maïs. Le bilan azoté met en évidence moins de reliquats azotés dans les parcelles des variétés de maïs fourrage hautement digestibles, et plus d’azote exporté à travers le rendement et la MAT.
• PDIN : protéines digestibles dans l’intestin permises par PDIN l’apport d’azote.
Un maïs typé « fibres » s’adapte à tous les types de rations comme l’indique le tableau ci-dessous d’ARVALIS - Institut du végétal.
Impact du profil énergétique du maïs fourrage utilisé (0,90 UFL/kg MS) dans différents types de ration sur le risque acidogène liée à la teneur en amidon dégradable :
À ce jour, et plus que jamais, produire des fourrages de qualité obtenus grâce à des variétés performantes sont un véritable levier de maîtrise des coûts alimentaires de son troupeau .
Les variétés de maïs fourrage hautement digestibles HDi®, en plus d’assurer une hausse de la marge, permettent également d’assurer la bonne santé de ses animaux tout en augmentant leurs performances.
Pour vous aider à faire votre choix, cliquez sur la vidéo :
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