Agriculture Reference
In-Depth Information
Table 17.7.
Fitted equations describing responses to threonine, body weight gain (BWG, g/day), feed
conversion ratio (FCR, g/g), body protein deposition (BPd, g/day) and body lipid content (BLc, g/kg) at
optimum intake, and optimum intakes (Thri,
i
, mg/day) and contents (Thr
i
, g/kg) of threonine when fed to
broiler males and females in starter, grower and finisher phases.
Optimum
response
Equation
Thr
i
a
Thr
i
b
Starter phase
Females
BWG = -0.0004 × Thr
i
2
+ 0.18 × Thr
i
- 20.73
20.5
204
6.58
BPd = -0.00007 × Thr
i
2
+ 0.03 × Thr
i
- 3.57
3.49
182
5.87
BLc = 0.001 × Thr
i
2
- 0.58 × Thr
i
+ 91.89
88.7
277
8.95
Males
BWG = -0.0003 × Thr
i
2
+ 0.16 × Thr
i
- 21.36
21.6
228
6.71
BPd = -0.00005 × Thr
i
2
+ 0.03 × Thr
i
- 4.14
3.97
235
6.91
BLc = 0.001 × Thr
i
2
- 0.75 × Thr
i
+ 158.72
65.1
344
10.1
Combined
FCR = 0.00006 × Thr
i
2
- 0.03 × Thr
i
+ 3.19
1.44
184
5.58
Grower Phase
Females
BWG = -0.0001 × Thr
i
2
+ 0.18 × Thr
i
- 61.11
58.2
600
5.61
BPd = -0.00002 × Thr
i
2
+ 0.03 × Thr
i
- 10.25
9.27
624
5.83
BLc = 0.0001 × Thr
i
2
- 0.35 × Thr
i
+ 191.13
117
777
7.26
Males
BWG = -0.0001 × Thr
i
2
+ 0.18 × Thr
i
- 70.94
66.7
743
6.41
BPd = -0.00002 × Thr
i
2
+ 0.03 × Thr
i
- 11.23
9.96
722
6.22
BLc = 0.0003 × Thr
i
2
- 0.53 × Thr
i
+ 270.63
105
909
7.84
Combined
FCR = 0.00001 × Thr
i
2
- 0.02 × Thr
i
+ 5.48
1.60
612
5.46
Finisher Phase
Females
BWG = -0.00009 × Thr
i
2
+ 0.18 × Thr
i
- 86.71
85.2
884
5.05
BPd = -0.00002 × Thr
i
2
+ 0.03 × Thr
i
- 14.35
15.2
835
4.77
BLc = 0.000009 × Thr
i
2
- 0.17 × Thr
i
+ 174.64
200
1077
6.15
Males
BWG = -0.00007 × Thr
i
2
+ 0.18 × Thr
i
- 106.59
105
1070
5.49
BPd = -0.00001 × Thr
i
2
+ 0.03 × Thr
i
- 18.31
18.6
1220
6.26
BLc = 0.00002 × Thr
i
2
- 0.17 × Thr
i
+ 180.79
188
1218
6.25
Combined
FCR = 0.000006 × Thr
i
2
- 0.01 × Thr
i
+ 5.36
1.76
823
4.45
a
mg/bird
/
day.
b
g/kg.
the responses are the consequence of the
limiting amino acid being tested without
being confounded by imbalances or antagon-
appeared to be a true reflection of changes in
the intake of the amino acids being tested. It
was confirmed that the responses were to the
