0.857
IF5
0.900
IF
Q3
JCR
0.92
CiteScore
0.405
SJR
Q2
SJR
20
MNiSW
165.24
ICV
ORIGINAL PAPER
 
CC-BY 4.0
 
 

A model for estimating endogenous protein flows in the gastrointestinal tract of ruminants

A. G. Assis 1,  
J. France 2,  
J. Dijkstra 3,  
 
1
Embrapa, Centro Nacional de Pesquisa de Gado de Leite, Rua Eugenio do Nascimento 610, Dom Bosco - Juiz de Fora, MG, 36038-330 Brazil
2
Institute of Grassland and Environmental Research, North Wyke, Devon EX20 2SB, United Kingdom
3
Wageningen Institute of Animal Sciences, Animal Nutrition Group, Marijkeweg 40, 6709 PG Wageningen, The Netherlands
4
University of Manitoba, Department of Animal Science, Winnipeg, Manitoba R3T 2N2, Canada
J. Anim. Feed Sci. 1997;6(3):289–301
Publish date: 1997-08-19
KEYWORDS
ABSTRACT
A simulation model was built to represent the kinetics of endogenous-protein nitrogen (EPN) in the gastrointestinal tract (GIT) of ruminants. The GIT is split into three compartments, namely: stomach, small intestine and large intestine. The model contains three pools corresponding to these compartments and utilizes two types of source (secretions and inflow) and exit (absorption and passage) for EPN. Parameter values are set based on relevant data from the literature. According to model predictions, proportion of EPN in the total N flow increases as CP content of the diet and nitrogen intake decrease. On extremely low protein diets, EPN may represent 43, 66 and 92% of the total N in the abomasal, ileal and faecal contents, respectively. The model can contribute to improve knowledge on nitrogen recycling as well as to account for endogenous protein losses in the calculation of maintenance requirements.
CORRESPONDING AUTHOR
J. France
Institute of Grassland and Environmental Research, North Wyke, Devon EX20 2SB, United Kingdom
 
CITATIONS (2):
1. Effects of expander-treating a barley-based concentrate on ruminal fermentation, bacterial N synthesis, escape of dietary N, and performance of dairy cows
Egil Prestløkken, Odd Magne Harstad
Animal Feed Science and Technology
2. Rebuttal of the critique of a dynamic model of N metabolism
Journal of Animal Science
ISSN:1230-1388