Table 2.
Body weight gain, feed intake and feed conversion ratio (FCR) of broilers fed different levels of crude protein and protease enzyme over 15–28 days.
| Item | Body Weight Gain (g) | Feed Intake (g) | FCR (g/g) |
|---|---|---|---|
| CP 1 | |||
| CP-17 | 938.0 b | 1895.0 | 2.02 a |
| CP-19 | 1098.4 a | 1857.1 | 1.69 b |
| CP-21 | 1096.0 a | 1873.2 | 1.71 b |
| Pooled SEM | 76.33 | 102.45 | 0.11 |
| Enzyme 2 | |||
| Without enzyme | 1021.0 b | 1867.2 | 1.84 a |
| CP + enzyme | 1067.0 a | 1883.1 | 1.77 b |
| Pooled SEM | 45.66 | 124.00 | 0.12 |
| CP × Enzyme | |||
| CP-170 | 899.0 d | 1875.0 ab | 2.08 a |
| CP-17E | 977.3 c | 1915.4 a | 1.96 b |
| CP-190 | 1082.2 b | 1858.0 ab | 1.71 c |
| CP-19E | 1115.0 a | 1856.4 b | 1.66 d |
| CP-210 | 1082.4 b | 1869.0 ab | 1.72 c |
| CP-21E | 1109.00 ab | 1877.4 ab | 1.69 cd |
| Pooled SEM | 78.33 | 106.55 | 0.11 |
| p-Value | |||
| CP | <0.001 | 0.1799 | <0.001 |
| Enzyme | 0.0001 | 0.3301 | 0.0001 |
| CP × Enzyme | 0.0456 | 0.0383 | 0.0238 |
Means in the same column with different superscripts differ significantly (p < 0.05). 1 Diets containing different levels of CP: CP-1 = 17% CP; CP-2 = 19% CP; CP-3 = 21% CP (all these diets were with or without protease enzyme). 2 Protease enzyme at 30,000 UI/kg.