Table 1.
Percentage of dietary digestible AA levels for the 5 different strains of broilers fed the control diet and AA-reduced diet during starter (day 0–14), grower (day 14–28), finisher (day 28–41), and withdrawal (day 41–56) feeding phases.
| Phases | Nutrients | Strain 1 |
Strain 2 |
Strain 31 |
Strain 4 and 52 |
||||
|---|---|---|---|---|---|---|---|---|---|
| Control | Reduced | Control | Reduced | Control | Reduced | Control | Reduced | ||
| Starter | Dig. Lys, % | 108.5 | 86.8 | 104.9 | 83.9 | 104.1 | 83.3 | 100.0 | 80.0 |
| Dig. TSAA, % | 108.0 | 86.4 | 104.4 | 83.5 | 103.3 | 82.6 | 100.0 | 80.0 | |
| Dig. Thr, % | 111.7 | 89.6 | 108.9 | 87.3 | 107.5 | 86.3 | 100.0 | 80.2 | |
| Grower | Dig. Lys, % | 109.5 | 87.6 | 106.5 | 85.2 | 105.5 | 84.4 | 100.0 | 80.0 |
| Dig. TSAA, % | 108.8 | 87.5 | 106.1 | 85.4 | 104.8 | 84.3 | 100.0 | 80.5 | |
| Dig. Thr, % | 111.6 | 89.9 | 108.5 | 87.3 | 106.9 | 86.1 | 100.0 | 80.5 | |
| Finisher | Dig. Lys, % | 107.4 | 86.3 | 104.1 | 83.7 | 98.1 | 78.8 | 100.0 | 80.4 |
| Dig. TSAA, % | 108.1 | 86.5 | 105.3 | 84.2 | 100.0 | 80.0 | 100.0 | 80.0 | |
| Dig. Thr, % | 104.6 | 83.1 | 101.5 | 80.6 | 98.6 | 78.3 | 100.0 | 79.4 | |
| Withdrawal | Dig. Lys, % | 105.6 | 84.4 | 102.2 | 81.7 | 102.2 | 81.7 | 100.0 | 80.0 |
| Dig. TSAA, % | 105.7 | 84.3 | 102.8 | 81.9 | 101.4 | 80.8 | 100.0 | 79.7 | |
| Dig. Thr, % | 104.9 | 83.6 | 101.6 | 81.0 | 101.6 | 81.0 | 100.0 | 79.7 | |
1
The nutritional requirements of strain 3 were based on the male line, because there were no specific recommendations for the cross available.
2
The nutritional requirements of strains 4 and 5 were the same; therefore, the relative percentage was the same in strains 4 and 5.