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Journal of Dairy Science Vol. 77 No. 5 1360-1371
© 1994 by American Dairy Science Association ®
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Effects of Extrusion of Whole Horse Beans on Protein Digestion and Amino Acid Absorption in Dairy Cows

C. Benchaar 1, M. Vernay 1, C. Bayourthe 1, and R. Moncoulon 1

1 Ecole Nationale Supérieure Agronomique, Laboratoire d'Ingénierie Agronomique, 145 Avenue de Muret, 31076 Toulouse Cedex, France

Four lactating cows fitted with ruminal, duodenal, and ileal cannulas were used to determine the effects of extrusion of whole horse beans on ruminal CP degradation and absorption of AA from the small intestine. Diets contained 15% CP, of which 46% was provided by the raw or extruded whole horse beans. Spot samples of duodenal and ileal digesta were collected during a 72-h period. The markers Cr-EDTA, YbCl3, and purines were used for liquid, particulate, and bacteria, respectively. Extruded whole horse beans increased AA flow to the duodenum and disappearance in the small intestine. Diets containing extruded whole horse beans increased availability of total essential AA in the small intestine compared with diets containing raw whole horse beans.

Key Words: whole horse beans • amino acids • absorption • extrusion

Submitted on September 28, 1993
Accepted on December 21, 1993




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Copyright © 1994 by the American Dairy Science Association ®.