Agriculture Reference
In-Depth Information
Table 6.3.
Diet composition and analysed nutrients of the experimental diets (g/kg as fed basis) with lysine
in limiting position. (From Experiment
1,
starter period, Pastor
et al
., 2013.)
Ingredient
N1
N2
N3
N4
N5
N6
N7
N8
Wheat starch
794
691
587
484
308
205
103
0.00
Wheat
72.4
121
169
217
265
314
362
410
SPC
61.8
103
144
185
226
268
309
350
Wheat gluten
10.5
17.4
24.4
31.4
38.4
45.3
52.3
59.3
Fish meal
6.43
10.7
15.0
19.3
23.6
27.9
32.2
36.4
DCP
28.5
26.0
23.5
21.0
18.5
16.0
13.5
11.0
Soybean oil
10.0
13.5
17.0
20.3
97.0
99.5
103
105
Premix
10.0
10.0
10.0
10.0
10.0
10.0
10.0
10.0
NaCl
2.50
2.50
2.50
2.40
2.30
2.20
2.10
2.06
CaCO
3
2.30
3.20
4.00
4.70
5.70
6.50
7.20
8.00
dl
-Met
0.90
1.51
2.11
2.71
3.32
3.92
4.52
5.12
l
-Val
0.30
0.50
0.70
0.89
1.09
1.29
1.49
1.69
l
-Thr
0.18
0.29
0.41
0.53
0.65
0.76
0.88
1.00
l
-Trp
0.01
0.02
0.02
0.03
0.04
0.05
0.05
0.06
Analysed (g/kg DM)
Crude ash
5.03
5.30
5.55
5.78
6.01
6.26
6.51
6.77
Crude protein
6.46
10.8
15.2
19.7
24.1
28.6
33.2
37.8
Crude fat
1.43
1.99
2.56
3.11
11.6
12.1
12.7
13.3
Crude fibre
0.79
1.04
1.29
1.55
1.76
2.03
2.28
2.55
Starch
74.5
69.2
64.0
58.7
46.5
41.2
35.7
30.2
ME (MJ/kg DM)
1
14.18
14.18
14.18
14.18
15.74
15.74
15.74
15.74
a
Calculated, based on WPSA (1984).
Table 6.4.
Summarized results of protein quality assessment of lysine limiting chicken diets with graded
dietary protein supply. (From Experiment
1,
starter and grower period, Pastor
et al.
, 2013.)
Diet
N1
N2
N3
N4
N5
N6
N7
N8
Starter period
b
-value (
b
·
10
-
6
)
196
-
a
219
213
200
192
203
204
Grower period
b
-value (
b
·
10
-
6
)
197
197
196
198
195
202
206
187
a
Not detectable, outliers due to feed refusal.
estimation of model parameters (
ND
max
T
,
NMR
)
and the evaluation of dietary protein quality
(parameter
b
), results of these N response ex-
periments are also useful in extending the data-
base of AA requirement studies. For these
applications, a valid definition of the limiting
AA in the diet under study is a prerequisite.
In this case, the shape of the
NR
-curve is
not only a function of
NI
, but also of the daily
intake of the limiting AA (
LAAI
) as a part of
the feed protein fraction. For that important
application, Eqn 6.1 is logarithmically trans-
formed (natural logarithm, ln), providing
Eqns 6.3 and 6.4, respectively:
NI
= [ln
NR
max
T
- ln(
NR
max
T
-
NR
)]:
b
(6.3)
b
= [ln
NR
max
T
- ln(
NR
max
T
-
NR
)]:
NI
(6.4)
The model parameters
NR
max
T
and
NMR
for the genotype and the observed data for
NR
are used to calculate
NI
and
b
, respect-
ively. The derived
NI
(Eqn 6.3) gives the
daily quantity of dietary protein (in terms
of
NI
as defined above) needed to yield the
intended level of growth performance (in
terms of
NR
, as defined above) at a given or
observed dietary protein quality (in terms of
