Table 1.
Means (± SD) for growth, feed efficiency, and carcass traits for the high and low RFI cohortsa
| Traitsb | High RFI | Low RFI |
|---|---|---|
| BW28 (g) | 1231 ± 81 | 1195 ± 82 |
| BW42 (g) | 2448 ± 166 | 2428 ± 134 |
| ADFI (g/d) | 176.3 ± 11.3** | 156.3 ± 8.4 |
| ADG (g/d) | 86.95 ± 9.57 | 88.07 ± 5.86 |
| RFI (g/d) | 9.39 ± 3.48** | − 10.71 ± 2.06 |
| RFIa (g/d) | 9.99 ± 2.86** | − 7.13 ± 2.81 |
| FCR (g/g) | 2.04 ± 0.12** | 1.78 ± 0.05 |
| CW (g) | 2184 ± 156 | 2164 ± 109 |
| BrW (g) | 518.0 ± 42.1 | 546.1 ± 49.5 |
| ThW (g) | 395.7 ± 48.0 | 394.4 ± 31.3 |
| AbF (g) | 31.61 ± 10.24** | 20.48 ± 8.65 |
| CWP (%) | 89.18 ± 0.84 | 89.67 ± 2.83 |
| BrP (%) | 21.17 ± 1.06 | 22.47 ± 1.29** |
| ThP (%) | 16.12 ± 1.11 | 16.23 ± 0.52 |
| AbP (%) | 1.30 ± 0.42** | 0.84 ± 0.35 |
aHigh RFI group (n = 15) consisting of samples from generation 6 of male broilers with the highest RFI values and low RFI group (n = 15) with the lowest RFI values; **P < 0.01
bBW28, body weight at 28 d of age; BW42, body weight at 42 d of age; ADFI, average daily feed intake; ADG, average daily gain; RFI, residual feed intake; RFIa, residual feed intake adjusted for weight of abdominal fat; FCR, feed conversion ratio; CW, carcass weight; BrW, breast muscle weight; ThW, thigh muscle weight; AbF, weight of abdominal fat; CWP, percentage of carcass weight; BrP, percentage of breast muscle; ThP, percentage of thigh muscle; AbP, percentage of abdominal fat