Table 2. Effects of stocking density (SD) and dietary supplementation of vitamin C (Vit C) on growth performance of broiler chickens
| Treatment | Growth performance |
| SD (birds/m2) | Vit C (mg/kg) | IBW (g) | FBW (g) | BWG (g) | FI (g) | FE (g/kg) |
| 9 | 0 | 614 | 1,586 | 972 | 1,633 | 596 |
| 200 | 613 | 1,555 | 942 | 1,633 | 577 |
| 18 | 0 | 614 | 1,481 | 867 | 1,476 | 587 |
| 200 | 613 | 1,465 | 852 | 1,470 | 580 |
| SEM (n = 6) | | 1.5 | 22.4 | 22.4 | 31.4 | 8.3 |
| Main effect |
| SD (birds/m2) |
| 9 | | 613 | 1,570 | 957 | 1,633 | 586 |
| 18 | | 613 | 1,473 | 860 | 1,473 | 583 |
| SEM (n = 12) | | 1.1 | 15.8 | 15.8 | 22.2 | 5.9 |
| Vit C (mg/kg) |
| 0 | | 613 | 1,533 | 920 | 1,554 | 592 |
| 200 | | 613 | 1,510 | 897 | 1,551 | 578 |
| SEM (n = 12) | | 1.1 | 15.8 | 15.8 | 22.2 | 5.9 |
| Effect (p-value) | df | | | | | |
| SD | 1 | 0.98 | < 0.01 | < 0.01 | < 0.01 | 0.73 |
| Vit C | 1 | 0.52 | 0.31 | 0.33 | 0.93 | 0.13 |
| SD × Vit C | 1 | 0.71 | 0.74 | 0.76 | 0.93 | 0.53 |
IBW, initial body weight; FBW, final body weight; BWG, body weight gain; FI, feed intake; FE, feed efficiency.