Agriculture Reference
In-Depth Information
Table 19.1.
Composition of the summit (high protein) and nitrogen-free basal feeds used in the lysine (Lys),
methionine + cysteine (Met+Cys) and threonine (Thr) response trials.
Lys
Met+Cys
Thr
Ingredients
Summit
Nitrogen-free
Summit
Nitrogen-free
Summit
Nitrogen-free
Maize
478
447
443
Soybean meal 45%
285
390
393
Maize gluten meal
88.4
dl
-methionine
3.00
3.20
4.60
l
l-valine
1.60
1.50
l
l-threonine
1.20
l
l-lysine HCl
0.40
0.30
l
-tryptophan
0.30
0.10
0.10
Soybean oil
30.1
100
49.6
48.8
50.1
48.8
Limestone
93.1
87.3
90.1
86.7
90.1
86.7
Dicalcium phosphate
14.7
19.8
10.9
16.9
10.9
16.9
Salt
5.30
5.10
5.10
5.20
5.10
5.20
Vitamin premix
a
1.50
1.50
1.00
1.00
1.00
1.00
Choline chloride 60%
0.50
0.50
0.50
0.50
0.50
0.50
BHT
b
0.10
0.10
0.10
0.10
0.10
0.10
Starch
368
500
500
Rice husk
205
120
120
Sugar
150
150
150
Sand
50.0
58.6
58.6
Potassium chloride
12.7
12.3
12.3
Calculated nutrient content
Metab. energy (Mcal/kg)
2.85
2.85
2.85
2.85
2.86
2.85
Crude protein
224
8.70
219
6.50
221
6.50
Calcium
40.2
40.2
39.0
39.0
39.0
39.0
Available phosphorus
3.80
3.80
2.90
2.90
2.90
2.90
Lysine
c
(g/kg)
9.09
11.4
11.4
Methionine+cysteine
c
(g/kg)
9.65
8.95
10.3
Methionine
c
(g/kg)
6.51
6.07
7.43
Tryptophan
c
(g/kg)
2.44
2.61
2.61
Threonine
c
(g/kg)
7.46
8.63
7.48
a
Content/kg vitamin A =
7,500,000
UI; vitamin E = 5000 UI; vitamin B1 = 1800 mg; vitamin B2 = 4000 mg; vitamin B6 = 3500 mg;
vitamin B12 = 7500 μg; pantothenic acid =
15
g; vitamin B3 =
35
g; selenium =
250
mg; antioxidant =
250
mg; excipient
87.0439%; manganese =
65
g; iron =
45
g; zinc =
50
g; copper = 7500 mg; and iodine = 700 mg.
b
Butyl hydroxy toluene.
c
Digestible amino acid composition.
content of all amino acids in the summit
basal other than the test amino acid was
specified as 1.4 times the recommendations
for laying hens for the Lys trial and 1.5 times
for the Met+Cys and Thr trials based on
Rostagno
et al
. (2011), whereas the level of
the test amino acid was kept at 1.2 times the
recommended level for the Lys trial and 1.3
times for Met+Cys and Thr. The blending
proportions are given in
Table 19.2
.
A control treatment was included in
each trial: The feed with the lowest content
of the test amino acid (level 7) was supple-
mented with synthetic
l
l-lysine HCl (78.5%),
dl
-methionine (99%) or
l
l-threonine (90.6%)
such that the content of the test amino acid
was the same as that at the next-highest
level but with all other nutrients the same
as in the lowest dilution.
Feed and water were available
ad libitum
.
Feed intake (g/bird/day) was measured at
the end of each week, eggs were collected and
recorded daily and egg weight (g) was meas-
ured three times a week. These data were used
