REVIEW PAPER
A dynamic simulation model of nutrient digestion
in the rumen of dairy cows
| 1 |
Research Centre Foulum, Danish Institute of Agricultural Sciences,
Department of Animal Nutrition and Physiology,
PO Box 50, DK-8830 Tjele, Denmark |
| 2 |
The Royal Veterinary and Agricultural University,
Department of Animal Science and Animal Health,
Grønnegaardsvej 3, DK-1870 Frederiksberg C, Denmark |
J. Anim. Feed Sci. 2002;11(3):367–397
Publication date: 2002-08-02
KEYWORDS
ABSTRACT
A mechanistic model of nutrient digestion in the rumen of dairy cows has been developed to
predict rates of nutrient digestion and passage as well as rumen NDF pool sizes at fixed rates of dry
matter intake. Different feed fractions according to chemical and physical characteristics are considered. There are 18 rumen state variables representing carbohydrates, nitrogen and microbes in the
model. The model is mainly sensitive to the parameters defining rate constants of passage of small
particles and digestion rate constant of NDF. For comparative analysis the model has been tested
with diets differing widely in intake level and composition. NDF passage and digestibility, NDF
pool, total and non-ammonia nitrogen outflow from rumen are well predicted for the whole range
of diets used. For some diets, especially those containing maize as a source of starch the predictions
of OM and starch digestibility and partition of NAN outflow between dietary and microbial N outflow are not satisfactory.
CITATIONS (2):
| 1. |
Carbohydrate quantitative digestion and absorption in ruminants: from feed starch and fibre to nutrients available for tissues
P. Nozière, I. Ortigues-Marty, C. Loncke, D. Sauvant
animal
|
| 2. |
Metabolic Models of Ruminant Metabolism: Recent Improvements and Current Status
M.D. Hanigan, H.G. Bateman, J.G. Fadel, J.P. McNamara
Journal of Dairy Science
|
