Table 3. Growth performance of male broilers aged 22- to 29-days old fed diets containing different dietary standardized ileal digestible methionine concentrations1)
| Item | Dietary SID methionine concentration (%) | SEM | p-values |
| 0.40 | 0.45 | 0.50 | 0.55 | 0.60 | 0.65 | Linear | Quadratic |
| Initial BW (at d 22) (g) | 745 | 744 | 745 | 745 | 745 | 745 | 1.08 | 0.942 | 0.529 |
| Final BW (at d 29) (g) | 1,061 | 1,108 | 1,122 | 1,116 | 1,117 | 1,098 | 40.47 | 0.107 | 0.006 |
| Weight gain (g/bird) | 316.0 | 364.5 | 377.2 | 370.7 | 372.2 | 353.3 | 40.58 | 0.105 | 0.006 |
| Feed intake (g/bird) | 534.8 | 583.8 | 588.6 | 600.4 | 593.9 | 573.9 | 41.79 | 0.062 | 0.007 |
| G:F (g/kg) | 594.8 | 625.5 | 640.5 | 616.1 | 624.8 | 613.6 | 17.09 | 0.641 | 0.143 |
| Feather weight (g) | 21.6 | 21.5 | 23.1 | 23.5 | 19.0 | 22.6 | 1.45 | 0.863 | 0.671 |
| Feathers (% of BW) | 1.95 | 1.90 | 2.09 | 2.03 | 1.60 | 1.91 | 0.11 | 0.226 | 0.525 |
Values are least squares means of eight replicate cages, with four birds per cage.
SID, standardized ileal digestible; BW, body weight; G:F, gain to feed ratio.