NDLI: Effet du traitement thermique des graines de lin sur la biohydrogénation ruminale des acides gras polyinsaturés et la qualité de la matière grasse du lait de vache

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Effet du traitement thermique des graines de lin sur la biohydrogénation ruminale des acides gras polyinsaturés et la qualité de la matière grasse du lait de vache

Content Provider	Semantic Scholar
Author	Akraim, Fowad
Copyright Year	2005
Abstract	La biohydrogenation (BH) des acides gras de graines de lin crues, conditionnees ou extrudees a ete etudiee in vitro, in situ et dans les contenus ruminal et duodenal. La BH des acides gras polyinsatures a surtout produit comme intermediaires 9,11,15C18:3, trans-11, cis-15C18:1, et trans-11 a trans-16C18:1. Le conditionnement a ralenti la BH de C18:3 et l'extrusion a augmente les proportions d'intermediaires. Les resultats in vitro etaient proches de ceux obtenus sur le flux duodenal mais la BH etait lente in situ avec une accumulation importante d'intermediaires. La BH etait faible dans la phase solide du contenu ruminal et elevee dans la phase liquide. L'ingestion de 2,8 kg de graines de lin crues ou extrudees par des vaches a diminue la production de lait sans modifier les taux butyreux et proteique, a diminue la teneur du lait en C6:0-C16:0 et le rapport omega-6/omega-3, et a augmente les proportions de trans-C18:1, cis-9, trans-11C18:2, trans-11, cis-15C18:2, 9,11,15C18:3 et C18:3. ABSTRACT : Biohydrogenation (BH) of raw, conditioned or extruded linseed fatty acids was investigated in vitro, in situ, and in ruminal and duodenal contents. The BH of polyunsaturated fatty acids mainly resulted in the following intermediates : 9,11,15C18:3, trans-11, cis-15C18:1, and trans-11 to trans-16C18:1. Conditioning slowed down the BH of C18:3 and extrusion increased proportions of BH intermediates. In vitro results were close to that from duodenal flow but the BH rate was lower in situ with an important accumulation of intermediates. The BH was low in the rumen solid phase and high in the rumen fluid. Intake of 2,8 kg of raw or extruded linseed decreased cow milk production without modifying fat or protein percents, decreased milk content of C:0-C16:0 and omega -6/omega-3 ratio, and increased the proportions of trans-C18:1, cis-9, trans-11C18:2, trans-11, cis-15C18:2, 9,11,15C18:3 et C18:3.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://oatao.univ-toulouse.fr/7300/1/akraim.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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