Table 2.
Effect of graded amylase supplementation on growth performance of broiler chickens.1
| Item | α-amylase, KNU/kg |
SEM | Linear | Quadratic | ||
|---|---|---|---|---|---|---|
| 0 | 80 | 160 | ||||
| BW, g | ||||||
| Day 0 | 36.3 | 36.3 | 36.3 | 0.02 | 0.416 | 0.636 |
| Day 7 | 124.0 | 128.4 | 126.2 | 2.27 | 0.497 | 0.258 |
| Day 14 | 381.8 | 395.7 | 392.0 | 6.78 | 0.304 | 0.306 |
| Day 21 | 806.0 | 884.0 | 870.4 | 11.96 | 0.002 | 0.007 |
| Day 0 to 7 | ||||||
| BW gain, g/bird | 87.7 | 92.1 | 89.9 | 2.27 | 0.501 | 0.256 |
| Feed intake, g/bird | 128.1 | 129.4 | 116.8 | 11.86 | 0.508 | 0.638 |
| Gain:feed, g/kg | 694.5 | 755.9 | 826.1 | 60.73 | 0.149 | 0.958 |
| Day 0 to 14 | ||||||
| BW gain, g/bird | 345.5 | 359.4 | 355.7 | 6.78 | 0.305 | 0.316 |
| Feed intake, g/bird | 435.8 | 452.8 | 426.5 | 18.56 | 0.727 | 0.356 |
| Gain:feed, g/kg | 798.5 | 808.4 | 839.2 | 33.64 | 0.407 | 0.803 |
| Day 0 to 21 | ||||||
| BW gain, g/bird | 769.6 | 837.1 | 834.1 | 14.69 | 0.007 | 0.070 |
| Feed intake, g/bird | 1,073.8 | 1,094.6 | 1,049.6 | 28.20 | 0.554 | 0.357 |
| Gain:feed, g/kg | 718.3 | 766.7 | 796.1 | 13.36 | 0.001 | 0.571 |
1
Data are least square means of 8 replicate cages per diet.