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 Rivest, J.
Right arrow Articles by Pomar, C.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Rivest, J.
Right arrow Articles by Pomar, C.

Journal of Animal Science, Vol 78, Issue 2 328-340, Copyright © 2000 by American Society of Animal Science

JOURNAL ARTICLE

A dynamic model of protein digestion in the small intestine of pigs

J. Rivest, J. F. Bernier and C. Pomar
Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, Lennoxville, Quebec.

A dynamic mathematical model of the digestion of proteins in the small intestine of pigs was developed. The model integrates current knowledge on the transit of digesta along the small intestine, endogenous secretions, digestion of proteins, and absorption of amino acids into a mechanistic representation of digestion. The main characteristics of the model are the following: the small intestine is divided into several segments of variable length but with equal digesta retention time; the rate of transfer of digesta between segments is based on the progression of myoelectric migration complexes; pancreatic and biliary secretions are poured into the first segment, whereas intestinal secretions enter all intestinal segments; protein hydrolysis is described by first-order equations; and an intestinal absorption capacity is used to estimate absorption of hydrolyzed protein. Simulation results are consistent with observed data, although more information is needed to represent reality more closely. The sensitivity analysis shows that parameters for protein hydrolysis largely determine protein digestibility. The absorption capacity of the small intestine limits the absorption of amino acids at the beginning of a meal and modulates the appearance of amino nitrogen in the portal vein. It also shows that amino acid absorption can be limiting to protein digestibility when large amounts of protein are eaten in a single daily meal. The model is useful in evaluating the dynamics of protein digestion and absorption of feedstuffs. The model can be used in evaluating protein digestion of different feedstuffs and feeding strategies.


This article has been cited by other articles:


Home page
 J ANIM SCIHome page
A. Wilfart, L. Montagne, P. H. Simmins, J. van Milgen, and J. Noblet
Sites of nutrient digestion in growing pigs: Effect of dietary fiber
J Anim Sci, April 1, 2007; 85(4): 976 - 983.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
P. J. Moughan
Simulating the partitioning of dietary amino acids: New directions
J Anim Sci, February 1, 2003; 81(14_suppl_2): E60 - 67.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2000 by the American Society of Animal Science.