J. Anim Sci.
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Cecava, M. J.
Right arrow Articles by Parker, J. E.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Cecava, M. J.
Right arrow Articles by Parker, J. E.

Journal of Animal Science, Vol 71, Issue 6 1596-1605, Copyright © 1993 by American Society of Animal Science

JOURNAL ARTICLE

Intestinal supply of amino acids in steers fed ruminally degradable and undegradable crude protein sources alone and in combination

M. J. Cecava and J. E. Parker
Department of Animal Sciences, Purdue University, West Lafayette, IN 47907.

The objective of this study was to examine the effect of combining ruminally degradable and undegradable CP sources on ruminal microbial protein synthesis and postruminal N and amino acid (AA) flows in steers. Six steers fitted with ruminal, duodenal, and ileal cannulas were fed diets containing corn silage and high-moisture corn supplemented with urea, soybean meal (SBM), dry corn gluten feed (DCGF), a combination of corn gluten meal and blood meal (CB), or SBM and DCGF in combination with CB. Estimated ruminal N escapes for SBM, DCGF, and CB were 32, 25, and 68%, respectively. Supplemental CP sources supplied 35 to 40% of diet CP (12.5% CP diets). Dry matter intake was adjusted to 2.3% of BW for each steer in each period. Total N flow at the duodenum decreased (P < .01) when the diet was supplemented with urea vs other proteins due to decreased (P < .01) flow of nonmicrobial N. However, microbial N and AA flows were greater (P < .05) for urea than for other protein supplements. Disappearance of OM and NDF in the stomach decreased (P < .07) or was numerically lower but nonmicrobial N at the duodenum increased (P < .08) as CB replaced SBM or DCGF in the diet. Protein source had little effect on ruminal fermentation characteristics except that ruminal ammonia N (NH3N) concentration was higher (P < .05) for urea than for other treatments. Total AA and essential AA flows to and disappearance from the small intestine increased (P < .06) as CB replaced DCGF. However, substituting CB for SBM had little effect on intestinal flows and disappearance of AA. These data suggest that source of ruminally degradable CP can influence the efficacy of feeding ruminally degradable and undegradable CP in combination. In general, source of supplemental CP had a greater effect on the quantity than on the profile of absorbable AA supplied to the duodenum.


This article has been cited by other articles:


Home page
 J ANIM SCIHome page
J. C. Marini, D. G. Fox, and M. R. Murphy
Nitrogen transactions along the gastrointestinal tract of cattle: A meta-analytical approach
J Anim Sci, March 1, 2008; 86(3): 660 - 679.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
L. R. Legleiter, A. M. Mueller, and M. S. Kerley
Level of supplemental protein does not influence the ruminally undegradable protein value
J Anim Sci, April 1, 2005; 83(4): 863 - 870.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
D. W. Bohnert, C. S. Schauer, M. L. Bauer, and T. DelCurto
Influence of rumen protein degradability and supplementation frequency on steers consuming low-quality forage: I. Site of digestion and microbial efficiency
J Anim Sci, November 1, 2002; 80(11): 2967 - 2977.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1993 by the American Society of Animal Science.