  We describe a mathematical modeling of the digestion in the small intestine.
The main interest of our work is to consider, at the same time, different
aspects of the digestion i.e. the transport of the bolus all along the
intestine, feedstuffs degradation according to the enzymes and local physical
conditions, and nutrients absorption. A system of coupled ordinary differential
equations is used to model these phenomena. The major unknowns of this system
are the position of the bolus and its composition. This system of equations is
solved numerically. We present different numerical computations for the
degradation, absorption and transport of the bolus with acceptable accuracy
with experimental data. The main feature and interest of this model are its
generality. Even if we are at an early stage of development, our approach can
be adapted to treat any kind of feedstuffs in any non-ruminant animal to
predict the composition and velocity of bolus in the small intestine.
