{"id":15531,"date":"2021-12-08T07:00:55","date_gmt":"2021-12-08T13:00:55","guid":{"rendered":"https:\/\/www.insta-pro.com\/?p=15531"},"modified":"2021-12-08T07:00:55","modified_gmt":"2021-12-08T13:00:55","slug":"quantite-totale-de-nutriments-digestibles-tdn-quelle-est-son-utilite","status":"publish","type":"post","link":"https:\/\/instapro.spinuhost.com\/fr\/blog\/nutrition-et-technologies\/quantite-totale-de-nutriments-digestibles-tdn-quelle-est-son-utilite\/","title":{"rendered":"Quantit\u00e9 totale de nutriments digestibles (TDN) : Quelle est son utilit\u00e9 ?"},"content":{"rendered":"<p>Il existe plusieurs m\u00e9thodes pour \u00e9valuer les ingr\u00e9dients des aliments pour animaux. Ceci est important parce que la composition et les caract\u00e9ristiques des ingr\u00e9dients qui constituent un r\u00e9gime complet <a href=\"https:\/\/www.insta-pro.com\/en\/blog\/nutritionandtechnologies\/are-your-animals-getting-all-they-can-out-of-corn\/\">influent sur la performance de l\u2019animal<\/a>, et les co\u00fbts des r\u00e9gimes repr\u00e9sentent environ 70% ou plus du total des co\u00fbts de production.<\/p>\n<p>Une des m\u00e9thodes d\u2019\u00e9valuation est appel\u00e9e \u00ab <a href=\"https:\/\/beef.unl.edu\/learning\/feedanalysis.shtml\">quantit\u00e9 totale des nutriments digestibles<\/a> \u00bb ou TDN. M\u00eame si sa popularit\u00e9 est en baisse, cette m\u00e9thode est toujours utilis\u00e9e, en particulier dans l\u2019industrie du boeuf. Il est important de noter qu\u2019il <a href=\"https:\/\/books.google.com\/books?hl=en&amp;lr=&amp;id=EgWw2Kd9mb4C&amp;oi=fnd&amp;pg=PT16&amp;ots=pQDSEr7Vji&amp;sig=PFLzwDst6Z2ZjwSnp-YSdsyK-0g#v=onepage&amp;q&amp;f=false\">existe<\/a> diff\u00e9rentes versions de TDN <a href=\"https:\/\/books.google.com\/books?hl=en&amp;lr=&amp;id=EgWw2Kd9mb4C&amp;oi=fnd&amp;pg=PT16&amp;ots=pQDSEr7Vji&amp;sig=PFLzwDst6Z2ZjwSnp-YSdsyK-0g#v=onepage&amp;q&amp;f=false\">(voir p. 13 et au-del\u00e0)<\/a>, bas\u00e9 sur le type d\u2019ingr\u00e9dient en question ; c\u2019est pourquoi il est important de comprendre quelle \u00e9quation est utilis\u00e9e lorsque l\u2019on examine les valeurs.<\/p>\n<p>Une valeur TDN est exprim\u00e9e sous forme de pourcentage. Les calculs g\u00e9n\u00e9raux, d\u2019au moins quelques versions, sont bien expliqu\u00e9s de mani\u00e8re pratique <a href=\"https:\/\/homesteadontherange.com\/2015\/03\/10\/what-is-tdn\/\">ici<\/a>. L\u2019id\u00e9e principale est que les compositions et les propri\u00e9t\u00e9s des cat\u00e9gories majeures des nutriments sont ajout\u00e9es pour obtenir un score. Les cat\u00e9gories sont des prot\u00e9ines brutes, des fibres brutes (ou une mesure sp\u00e9cifique des fibres), des graisses et des huiles et un extrait sans azote, chaque \u00e9l\u00e9ment \u00e9tant corrig\u00e9 individuellement pour la digestibilit\u00e9 totale dans le tube digestif, tandis que les graisses et les huiles qui sont riches en \u00e9nergie, sont sujettes \u00e0 une correction du facteur d\u2019\u00e9nergie. Essentiellement, au fur et \u00e0 mesure que la digestibilit\u00e9 totale dans le tube digestif augmente, le TDN augmente. Cela se produit plus rapidement avec les graisses et les huiles \u00e0 cause du facteur d\u2019\u00e9nergie. Un TDN plus \u00e9lev\u00e9 signifie que plus d\u2019\u00e9nergie est disponible pour la croissance, au moins en th\u00e9orie.<\/p>\n<p>L\u2019utilisation du TDN pr\u00e9sente les avantages suivants :<\/p>\n<ul>\n<li>Des volumes \u00e9lev\u00e9s d\u2019humidit\u00e9 et de cendres, qui ni l\u2019un, ni l\u2019autre ne fournit de l\u2019\u00e9nergie, auront pour effet de r\u00e9duire la valeur TDN. Le TDN d\u00e9tectera les ingr\u00e9dients dilu\u00e9s.<\/li>\n<li>La digestibilit\u00e9 totale dans le tube digestif indique le degr\u00e9 d\u2019utilit\u00e9 de l\u2019\u00e9nergie dans les ingr\u00e9dients \u00e0 des fins productives. L\u2019\u00e9nergie non dig\u00e9r\u00e9e ne peut pas contribuer \u00e0 la croissance de l\u2019animal.<\/li>\n<li>Toutefois, il est pr\u00e9f\u00e9rable d\u2019utiliser une valeur TDN plut\u00f4t que rien du tout.<\/li>\n<\/ul>\n<p>N\u00e9anmoins, l\u2019utilisation de TDN pr\u00e9sente de s\u00e9rieux inconv\u00e9nients. La plupart d\u2019entre eux sont les suivants :<\/p>\n<ul>\n<li>La cat\u00e9gorie \u00ab extrait sans azote \u00bb est un terme g\u00e9n\u00e9rique. Chaque ingr\u00e9dient a une composition diff\u00e9rente d\u2019extrait sans azote, avec des digestibilit\u00e9s totales diverses dans le tube digestif.<\/li>\n<li>Les prot\u00e9ines brutes constituent une cat\u00e9gorie g\u00e9n\u00e9rique. Les acides amin\u00e9s dans les prot\u00e9ines affectent la performance de l\u2019animal. Une valeur de digestibilit\u00e9 seulement ne fonctionne pas ; chaque \u00e9l\u00e9ment aura une <a href=\"https:\/\/www.insta-pro.com\/en\/blog\/nutritionandtechnologies\/express-soymeal-an-excellent-source-of-digestible-amino-acids-and-energy-for-swine\/\">valeur diff\u00e9rente<\/a>.\n<ul>\n<li>En outre, les digestibilit\u00e9s des acides amin\u00e9s ou des prot\u00e9ines d\u00e9termin\u00e9es dans le tube digestif entier (plut\u00f4t qu\u2019\u00e0 l\u2019extr\u00e9mit\u00e9 de l\u2019intestin gr\u00eale), sont souvent impr\u00e9cises, surestim\u00e9es et les acides amin\u00e9s restants ici contribuent peu ou pas du tout aux prot\u00e9ines corporelles totales <a href=\"https:\/\/www.waveland.com\/browse.php?t=11\">(reportez-vous ici au chapitre 12)<\/a>.<\/li>\n<\/ul>\n<\/li>\n<li>Comme je l\u2019ai mentionn\u00e9 <a href=\"https:\/\/www.insta-pro.com\/en\/blog\/nutritionandtechnologies\/evaluating-ingredients-energy-for-dairy-cows-tdn-vs-nel-part-6\/\">auparavant<\/a> dans le blog, d\u2019autres m\u00e9thodes de d\u00e9termination de l\u2019\u00e9nergie pr\u00e9disent mieux la performance de l\u2019animal.<\/li>\n<li>En fait, une <a href=\"https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC6612784\/#B40\">\u00e9tude<\/a> qui a examin\u00e9 les r\u00e9gimes avec des TDN diff\u00e9rents a rapport\u00e9 que le gain de poids journalier moyen du boeuf, la ingestion de mati\u00e8re s\u00e8che et les caract\u00e9ristiques de la carcasse n\u2019\u00e9taient pas affect\u00e9s par TDN.<\/li>\n<\/ul>\n<p>Par cons\u00e9quent, l\u2019importance d\u2019une valeur TDN pour un ingr\u00e9dient ou un r\u00e9gime complet est tr\u00e8s limit\u00e9e. Ceci est particuli\u00e8rement vrai pour les concentr\u00e9s qui ont \u00e9t\u00e9 am\u00e9lior\u00e9s par une transformation, comme par exemple, le <a href=\"https:\/\/www.insta-pro.com\/en\/blog\/nutritionandtechnologies\/high-shear-dry-extruded-products-for-highly-digestible-rumen-microbial-protein-in-dairy-part-ii-high-shear-dry-extruded-corn\/\">ma\u00efs ayant subi une extrusion \u00e0 sec \u00e0 haut cisaillement<\/a>, ou pour tout ingr\u00e9dient de sp\u00e9cialit\u00e9.<\/p>\n<p>Les m\u00e9thodes de test de la qualit\u00e9 des ingr\u00e9dients devraient \u00eatre test\u00e9es avec des essais d&rsquo;alimentation animale, tel qu\u2019Insta-Pro l\u2019a fait pendant plus de 50 ans.<\/p>\n<p>Consultez-nous pour savoir comment mieux \u00e9valuer vos ingr\u00e9dients dans les formulations.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Il existe plusieurs m\u00e9thodes pour \u00e9valuer les ingr\u00e9dients des aliments pour animaux. Ceci est important parce que la composition et les caract\u00e9ristiques des ingr\u00e9dients qui constituent un r\u00e9gime complet influent sur la performance de l\u2019animal, et les co\u00fbts des r\u00e9gimes repr\u00e9sentent environ 70% ou plus du total des co\u00fbts de production. Une des m\u00e9thodes d\u2019\u00e9valuation [&hellip;]<\/p>\n","protected":false},"author":13,"featured_media":14414,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[7181],"tags":[637,591,592,560],"class_list":["post-15531","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-nutrition-et-technologies","tag-formulation-de-lalimentation-animale","tag-strategie-commerciale-fr-3","tag-transformation-pour-lalimentation-humaine-ou-animale-fr-2","tag-usine-de-transformation-rentable-pour-lalimentation-animale-fr"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.2 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Quantit\u00e9 totale de nutriments digestibles (TDN) : Quelle est son utilit\u00e9 ? - Insta-Pro<\/title>\n<meta name=\"description\" content=\"M\u00eame 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