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Journal of Dairy Science Vol. 81 No. 1 140-149
© 1998 by American Dairy Science Association ®
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In Situ Disappearance of Amino Acids from Grass Silages in the Rumen and Intestine of Cattle

M.A.G. Von Keyserlingk 1, J. A. Shelford 1, R. Puchala 2, M. L. Swift 3, and L. J. Fisher 4

1 Department of Animal Science, University of British Columbia, 2357 Main Mall, Vancouver, BC, Canada V6T 1Z4
2 Department of Animal Physiology, Warsaw Agricultural University, Nowiyrsybiwja 166, 02-766 Warsaw, Poland
3 Pro Form Feeds Inc., 46255 Chilliwack Central Rd., PO Box 1000, Chilliwack, BC, Canada V2P 6J6
4 Pacific Agriculture Research Centre, Agassiz, BC, Canada V0M 1A0

Nineteen grass silages were evaluated using the in situ rumen and mobile nylon bag techniques to determine the amino acid (AA) composition of rumen-undegradable protein and the possibility of predicting the concentrations of individual AA presented to the duodenum from the dietary AA profiles. All feeds and residues from the nylon bags were analyzed for diaminopimelic acid to correct for contamination by microbial proteins. All essential AA behaved similarly; the initial feed had the highest concentrations, and the material remaining in the mobile nylon bag had the lowest concentrations. The reduction in the concentration of methionine between the 12-h rumen residue and the residue in the mobile nylon bag was significant. With the exception of arginine (r2 = 0.76) and serine (r2 = 0.82), the relationship was poor between the concentrations of AA in the grass silage and those in the residue in the nylon bag following 12 h of rumen incubation. The lack of reliable relationships between concentrations of individual AA in the silages and concentrations of AA in the 12-h rumen residue indicated that degradability characteristics of AA in grass silage were not alike. This poor relationship was likely the reason that prediction equations could not be developed between the AA composition of the initial feed and the pattern of AA presented to the duodenum following 12 h of rumen incubation. The AA composition of the rumen-undegradable portion of grass silages differs from the AA composition of grass silages.

Key Words: grass silage • amino acids • intestine • nylon bag

Submitted on December 5, 1996
Accepted on July 22, 1997




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A. Taghizadeh, M. Danesh Mesgaran, R. Valizadeh, F. E. Shahroodi, and K. Stanford
Digestion of Feed Amino Acids in the Rumen and Intestine of Steers Measured Using a Mobile Nylon Bag Technique
J Dairy Sci, May 1, 2005; 88(5): 1807 - 1814.
[Abstract] [Full Text] [PDF]


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