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Etude de l'effet de l'origine botanique de l'amidon sur sa digestibilité antécoecale chez le cheval : mise en place d'une méthode de référence in sacco

Abstract : Starch from cereals is the main source used to meet energetic requirements for performance horses. A part of this study was designed to adapt the mobile nylon bag technique, in cecal fistulated horses, in order to measure prececal starch digestion. This in sacco method allowed to demonstrate that the botanical origin of starch is a major factor interfering on the extent of prececal starch digestibility. Depending on the starch source, the prececal starch digestibility varies from 36 % to 99 %. Our data, obtained on different raw materials, could be used to include the digestible-starch-in-the-prececal-tract as a parameter in horse feeding programs. Another part of this work was set to get more information on the digestive mechanisms involved in starch digestion in horses. The study of biotic and abiotic factors related to carbohydrate digestion in the different compartments of the alimentary canal highlighted a microbial ecosystem in the stomach and the small intestine. The simultaneous observation of amylolytic and lactate-utilizing bacteria in high concentrations, of volatile fatty acids and lactate synthesis and of a starch disappearance over 60 %, indicate that a part of ingested starch is degraded by stomach microorganisms. The energetic yield of starch is directly related to the type of digestion: biochemical or biological. More research are needed on the function of the stomach ecosystem, and on the partitioning of prececal starch digestion, to optimize the energetic utilization of dietary starch.
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Submitted on : Tuesday, July 27, 2004 - 4:33:20 PM
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Alice Jevardat de Fombelle-Guermonprez. Etude de l'effet de l'origine botanique de l'amidon sur sa digestibilité antécoecale chez le cheval : mise en place d'une méthode de référence in sacco. Autre [q-bio.OT]. INAPG (AgroParisTech), 2003. Français. ⟨NNT : 2003INAP0034⟩. ⟨tel-00006594⟩

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