Agriculture Reference
In-Depth Information
5500
(I) =
ND
max
T
= 4592 mg
4500
(II) =
ND
max
T
= 4301 mg
3500
2500
1500
10-
20 days (I)
25-
35 days (II)
ND
=
NR
max
T
(
1-
e
-
b
·
NI
) -
NMR
500
0
1000
2000
3000
4000
5000
6000
-500
0.67
Daily nitrogen intake (mg/BW
kg
)
Fig. 6.3.
Prediction of the
ND
max
T
of male meat type chickens (Ross 308) depending on age and making
use of diets with graded protein supply. (From Pastor
et al
., 2013.)
3500
(I)
NEX
Lys
= 216.23
e
0,0005
NI
R
2
= 0.941
(I)
NEX
Thr
= 180.91
e
0,0005
NI
R
2
= 0.967
3000
(II)
NEX
Lys
= 264.7
e
0,0005
NI
R
2
= 0.965
(II)
NEX
Thr
= 229.90
e
0,0005
NI
R
2
= 0.983
2500
(III)
NEX
Lys
= 234.81
e
0,0006
NI
R
2
= 0.959
(III)
NEX
Thr
= 202.84
e
0,0006
NI
R
2
= 0.969
2000
1500
1000
10-
25 days (Lys Lim)
10-
25 days (Thr Lim)
NMR
=
221
500
30-
45 days (Lys Lim)
30-
45 days (Thr Lim)
50-
65 days (Lys Lim)
50-
65 days (Thr Lim)
0
0
1000
2000
3000
4000
5000
0.6
7
Daily nitrogen intake (mg/BW
kg
)
Fig. 6.4.
Prediction of the
NMR
of male meat type chicken (Ross 308) depending on age period making use
of diets with graded protein supply and observed N excretion. (From Samadi and Liebert, 2008.)
model parameter
b
, as defined above). The
NI
required for any given
NR
can thus be
calculated and thus table values of require-
ment data may be constructed and justified
due to the independence of protein quality
(
b
) from the observed
NI
. However, this
application is much more important for AA
requirement tables, as will be discussed
below. The model parameter
b
(protein qual-
ity) can be calculated using Eqn 6.4 taking
into account observed
NI
and corresponding
NR
data, respectively. For quantification of
