Table 2.
Descriptive statistics for the traits studied
| Trait1 | Mean | SD | Min | Max |
|---|---|---|---|---|
| TARC heifers (n = 119) | ||||
| Age at start of test, d | 371.9 | 28.3 | 272.0 | 424.0 |
| BW, kg | 354.5 | 36.8 | 246.0 | 446.0 |
| DMI, kg/d | 8.1 | 1.3 | 3.6 | 11.5 |
| Carbon dioxide production rate, g/d | 5760 | 644 | 4063 | 7707 |
| Carbon dioxide yield, g/kg | 724 | 106 | 542 | 1189 |
| Carbon dioxide intensity, g/kg | 16.3 | 1.4 | 12.5 | 19.6 |
| Residual carbon dioxide production from DMI, g/d | 0.00 | 1.01 | −2.23 | 2.68 |
| Residual carbon dioxide production from BW, g/d | 0.00 | 1.01 | −2.86 | 2.82 |
| Residual carbon dioxide production from DMI and BW, g/d | 0.00 | 1.01 | −2.17 | 2.48 |
| BIN steers (n=326) | ||||
| Age at start of test, d | 553.8 | 86.4 | 430.0 | 764.0 |
| BW, kg | 576.5 | 68.7 | 428.0 | 830.0 |
| Metabolic BW, kg | 117.5 | 10.4 | 94.1 | 154.6 |
| DMI, kg/d | 13.3 | 2.0 | 7.4 | 19.1 |
| ADG, kg/d | 1.75 | 0.30 | 0.89 | 2.77 |
| Feed conversion ratio | 7.72 | 1.25 | 4.94 | 15.63 |
| Residual feed intake, kg/d | −2.32 | 1.62 | −8.70 | 1.80 |
| Carbon dioxide production rate, g/d | 8939 | 1212 | 6045 | 12833 |
| Carbon dioxide yield, g/kg | 679 | 82 | 488 | 1146 |
| Carbon dioxide intensity, g/kg | 15.5 | 1.5 | 11.9 | 20.6 |
| Carbon dioxide to gain ratio | 5230 | 803 | 3537 | 9179 |
| Residual carbon dioxide production from DMI, g/d | 0.00 | 1.00 | −2.66 | 4.53 |
| Residual carbon dioxide production from BW, g/d | 0.00 | 1.00 | −2.69 | 3.48 |
| Residual carbon dioxide production from MBW1, g/d | 0.00 | 1.00 | −3.62 | 3.30 |
| Residual carbon dioxide production from DMI and BW, g/d | 0.00 | 1.00 | −3.37 | 3.47 |
| Residual carbon dioxide production from MBW1 and ADG, g/d | 0.00 | 1.00 | −2.73 | 2.86 |
1MBW denotes metabolic body weight.