lactation.machine.model: The Lactation model with milking machine

In ZeBook: Working with Dynamic Models for Agriculture and Environment

Description

Model description. This model is a model of lactating mammary glands of cattle described by Heather et al. (1983). This model was then inspired more complex models based on these principles. This model simulates the dynamics of the production of cow's milk. the system is represented by 6 state variables: change in hormone levels (H), the production and loss of milk secreting cells (CS), and removing the secretion of milk (M), the average quantity of milk contained in the animal (Mmean), the amount of milk removed (RM) and yield (Y). The model has a time step dt = 0.001 for milking machines. The model is defined by a few equations, with a total of twenty parameters for the described process.

Usage

lactation.machine.model(cu, kdiv, kdl, kdh, km, ksl, kr, ks, ksm, mh, mm,
  p, mum, rma, t1, t2, t3, t4, t5, t6, duration, dt, CSi, Mi)

Arguments

cu	: number of undifferentiated cells
kdiv	: cell division rate, Michaelis-Menten constant
kdl	: constant degradation of milk
kdh	: rate of decomposition of the hormone
km	: constant secretion of milk
ksl	: milk secretion rate, Michaelis-Menten constant
kr	: average milk constant
ks	: rate of degradation of the basal cells
ksm	: constant rate of degradation of milk secreting cells
mh	: parameter
mm	: storage Capacity milk the animal
p	: parameter
mum	: setting the maximum rate of cell division
rma	: parameter of milk m (t) function
t1	: parameter of milk m (t) function
t2	: parameter of milk m (t) function
t3	: parameter of milk m (t) function
t4	: parameter of milk m (t) function
t5	: parameter of milk m (t) function
t6	: parameter of milk m (t) function
duration	: duration of simulation
dt	: time step
CSi	: initial Number of secretory cells
Mi	: initial Quantity of milk in animal (kg)

Value

matrix with CS,M,Mmoy,RM

ZeBook documentation built on May 1, 2019, 9:48 p.m.