The increased SBM inclusion levels in the broiler diets improved the performance differently at different feeding phases. For each 1 % increment in SBM from the lowest dietary SBM inclusion level (T3 diet) at each feeding phase and considering the effect was linear for significant observations, the performance and net energy benefit values are listed below:
Starter phase d (0-10):
- FCR improved by 0.01 point
- NEm (per kg feed) increased by 2.62 kcal.
- Productive NE (per kg feed) increased by 10.71 kcal
- Net Energy (per kg feed) increased by 21.11 kcal
Grower phase (d11-22):
- Body weight increased by 5.5 g.
- ADG increased by 0.25 g.
- Protein mass increased by 1.47 g.
- FCR improved by 0.02 point
- NEm (per kg feed) increased by 3.82 kcal.
- Productive NE (per kg feed) increased by 12.85 kcal
- Net Energy (per kg feed) increased by 15.15 kcal
Finisher I (d 23-33)
- FCR numerically improved by 0.006 unit.
- NEm (per kg feed) numerically increased by 2.12 kcal.
- Productive NE (per kg feed) numerically increased by 8.94 kcal
- Net Energy (per kg feed) numerically increased by 16.86 kcal
Finisher II (d 34- 44)
- Body weight increased by 21.5 g.
- ADG increased by 0.485 g.
- Protein mass increased by 6.35 g.
- FCR improved by 0.04 point
- NEm (per kg feed) numerically increased by 12.86 kcal.
- Productive NE (per kg feed) numerically increased by 23.41 kcal
- Net Energy (per kg feed) increased by 26.13 kcal
SBM Inclusion, %
| Growth phase | Days | T1 | T2 | T3 |
| Starter | 0-12 | 40.02 | 34.02 | 28.02 |
| Grower | 11-22 | 37.29 | 31.29 | 25.29 |
| Finisher I | 23-33 | 33.37 | 28.37 | 23.37 |
| Finisher II | 34-44 | 31.29 | 26.20 | 21.20 |
Based on the results of this study, the dietary net energy value of soybean meal for broilers is greater than that currently recognized.
