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(I) NEX = 270 e 0.000548 NI R 2 = 0.89
3000
(II) NEX = 303 e 0.000585 NI R 2 = 0.95
2500
2000
(III) NEX = 348 e 0.000576 NI R 2 = 0.95
1500
1000
14-28 d (I)
56-70 d (II)
500
96-112 d (III)
0
0
500
1000
1500
2000
2500
3000
3500
0.67
Nitrogen intake (mg/BW kg /day)
Fig. 20.1. Nitrogen maintenance requirements ( NMR s) determined from the exponential function of
nitrogen intake and nitrogen excretion values for the pullets in growth periods I ( 14 to 28 days),
II ( 56 to 70 days) and III ( 96 to 112 days).
3000
(I) ND max T = 2938 mg
2500
(II) ND max T = 2050 mg
2000
1500
(III) ND max T = 1391 mg
1000
14- 28 days (I)
56- 70 days (II)
500
98- 112 days (III)
0
0
1000
2000
3000
4000
5000
0.6 7
Nitrogen intake (mg/BW kg /day)
500
Fig. 20.2. Theoretical maximum daily nitrogen deposition ( ND max T ) of pullets during periods I ( 14 to 28 days),
II ( 56 to 70 days) and III ( 96 to 112 days) based on the relationship between their nitrogen intake and
nitrogen deposition.
potential ND max T . Subsequent calcula-
tions are based on 40%, 50% and 60%
of the potential to reflect real perform-
ance by these birds. However, other pro-
portions may be used depending on the
situation.
Based on the efficiencies of amino acid
utilization and protein deposition, the amino
acid requirements were calculated from
which the optimal amino acid contents in
the diet were estimated by accounting for FI
(Table 20.5, 20.6 and  20.7 ).
 
 
 
 
 
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