Farm Animal Metabolism and Nutrition

Table 2.1 lists the model parameters
and the fractional transfer rates (Li,jfrom
compartment j to i). The fractional standard

deviation of the parameters ranges from 5

to 50% and, in general, L2,1, L1,2and L0,1or

L0,3are solved with a higher precision than

40 J.A. Rathmacher

1.000

0.100

0.010

0.001

Tracer to tracee ratio

0 1 2 3 4 5

Cattle, human and dog model

Observed Calculated

(A)

Time (min  1000)

0.100

0.010

0.001

Tracer to tracee ratio

0 1 2 3 4 5

Sheep model

Observed Calculated

(B)

Time (min  1000)

1.000

0.100

0.010

0.001

Tracer to tracee ratio

0 1 2 3 4 5 6

Swine model

Observed Calculated

(C)

Time (min  1000)

Fig. 2.10.Disappearance of tracer, 3-[^2 H 3 -methyl]methylhistidine, as the ratio of 3-[^2 H 3 -methyl]methylhisti-
dine to 3-methylhistidine in plasma as described by a three-compartment model of 3-methylhistidine (see

Fig. 2.11). Symbols () represent observed data, and the line () represents best fit generated by the model.