Effects of preconditioning and extrusion of linseed on the rumen fermentation of dry holestein cows

Fowad Akraim, . and Marie-Claude Nicot, . and Francis Enjalbert, . (2009) Effects of preconditioning and extrusion of linseed on the rumen fermentation of dry holestein cows. [Proceedings Paper]

The effect of preconditioning and extrusion of linseed and wheat bran 70:30 blend on rumen fermentation parameters was investigated. The blend was ground through a 3 mm screen and used raw RL or extruded EL or was ground through a 6 mm screen and preconditionedCL. Three dry Holstein cows fitted with ruminal and duodenal cannulas were used in a 3 x 3 Latin square design with 18 days adaptation. The diet was based on hay and contained 20 DM basis of the linseed based blend. With the three diets the pH of rumen content ranged between 6.32 and 7.17 and was significantly modified by linseed treatment. Total concentration of volatile fatty acids proportions of acetic propionic valeric and branched volatile fatty acids iso-valeric iso-butyric were not significantly affected by linseed treatment. Ammonia concentration in the rumen fluid tended P 0.055 to be higher with RL compared with CL or EL diets. Volatile fatty acids profile in the rumen was characteristic of a ration with a high forage proportion. The diminution of ruminal concentration of ammonia with thermal treatment may reveal a diminution in protein degradability.

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Abstract

The effect of preconditioning and extrusion of linseed and wheat bran 70:30 blend on rumen fermentation parameters was investigated. The blend was ground through a 3 mm screen and used raw RL or extruded EL or was ground through a 6 mm screen and preconditionedCL. Three dry Holstein cows fitted with ruminal and duodenal cannulas were used in a 3 x 3 Latin square design with 18 days adaptation. The diet was based on hay and contained 20 DM basis of the linseed based blend. With the three diets the pH of rumen content ranged between 6.32 and 7.17 and was significantly modified by linseed treatment. Total concentration of volatile fatty acids proportions of acetic propionic valeric and branched volatile fatty acids iso-valeric iso-butyric were not significantly affected by linseed treatment. Ammonia concentration in the rumen fluid tended P 0.055 to be higher with RL compared with CL or EL diets. Volatile fatty acids profile in the rumen was characteristic of a ration with a high forage proportion. The diminution of ruminal concentration of ammonia with thermal treatment may reveal a diminution in protein degradability.

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Item Type:	Proceedings Paper
Additional Information:	3 tables
AGROVOC Term:	Extrusion
AGROVOC Term:	Linseed
AGROVOC Term:	Rumen fermentation
AGROVOC Term:	Cows
AGROVOC Term:	Ammonia
AGROVOC Term:	Volatile fatty acids
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:27
URI:	http://webagris.upm.edu.my/id/eprint/15783

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