Table 3.
The phenotypic change (SE in parentheses) in the performance, efficiency, carcass, and ultrasound traits for a one unit change in terminal index for all animals, bulls, heifers, and steers
| Trait1 | All animals | Bulls | Heifers | Steers |
|---|---|---|---|---|
| Performance | ||||
| Average daily gain, kg/d | 0.00027 (0.00023) | 0.00023 (0.00038) | 0.00064 (0.00047) | −0.00006 (0.00033) |
| Dry matter intake, kg/d | −0.0055 (0.0012) | −0.0064 (0.0019) | −0.0062 (0.0024) | −0.0038 (0.0017) |
| Metabolizable energy intake, MJ/d | −0.069 (0.015) | −0.089 (0.024) | −0.075 (0.030) | −0.044 (0.021) |
| Metabolic live-weight, kg0.75 | 0.019 (0.051) | 0.005 (0.012) | 0.002 (0.015) | −0.0015 (0.010) |
| Preslaughter live-weight, kg | 0.0020 (0.0073) | 0.042 (0.083) | 0.039 (0.110) | −0.024 (0.072) |
| Age at slaughter, d | −0.058 (0.020) | −0.024 (0.032) | −0.085 (0.04) | −0.066 (0.027) |
| Adjusted age at slaughter, d | −0.079 (0.020) | −0.044 (0.032) | −0.11 (0.041) | −0.087 (0.027) |
| Efficiency | ||||
| Energy conversion ratio | −0.069 (0.014) | −0.051ab (0.022) | −0.119a (0.028) | −0.038b (0.019) |
| Relative growth rate | 0.000039 (0.000044) | 0.000018 (0.000072) | 0.000126 (0.000091) | −0.00003 (0.000062) |
| Kleiber ratio | 0.0000018 (0.0000018) | 0.0000009 (0.0000030) | 0.0000057 (0.0000038) | −0.0000011 (0.0000026) |
| Residual energy intake, MJ/d | −0.070 (0.010) | −0.096a (0.017) | −0.076ab (0.021) | −0.036b (0.014) |
| REIU, MJ/d | −0.048 (0.012) | −0.061 (0.019) | −0.066 (0.026) | −0.016 (0.019) |
| Residual gain, kg/d | 0.00066 (0.00019) | 0.0011a (0.00032) | 0.0007ab (0.0004) | 0.0001b (0.00027) |
| RGU, kg/d | 0.00044 (0.00022) | 0.00079 (0.00033) | 0.00065 (0.00045) | −0.00012 (0.00033) |
| Residual intake and gain | 0.0092 (0.0014) | 0.013a (0.0023) | 0.010ab (0.0028) | 0.004b (0.0019) |
| RIGU | 0.0068 (0.0018) | 0.0097a (0.0027) | 0.0096ab (0.0037) | 0.0011b (0.0027) |
| Carcass | ||||
| Carcass weight, kg | 0.17 (0.031) | 0.20 (0.050) | 0.17 (0.063) | 0.15 (0.043) |
| Carcass conformation, scale 1–15 | 0.013 (0.0010) | 0.013 (0.0017) | 0.014 (0.0021) | 0.014 (0.0014) |
| Carcass fat, scale 1–15 | −0.0097 (0.0011) | −0.011 (0.0017) | −0.008 (0.0022) | −0.01 (0.0015) |
| Dressing difference, kg | −0.15 (0.026) | −0.16 (0.042) | −0.13 (0.052) | −0.17 (0.036) |
| Dressing percentage, % | 0.025 (0.0017) | 0.026 (0.0028) | 0.025 (0.0035) | 0.025 (0.0024) |
| Ultrasound | ||||
| Ultrasound fat depth, mm | −0.012 (0.0013) | −0.0092a (0.0020) | −0.012ab (0.0026) | −0.016b (0.0020) |
| Ultrasound muscle depth, mm | 0.046 (0.0065) | 0.058 (0.0099) | 0.045 (0.013) | 0.035 (0.010) |
| Intramuscular fat, % | −0.0072 (0.0012) | −0.0076 (0.0018) | −0.0055 (0.0025) | −0.0083 (0.0019) |
a–bRegression coefficients within a row with difference superscripts differ (P < 0.05).
1REIU = residual energy intake adjusted for ultrasound fat depth; RGU = residual gain adjusted for ultrasound fat depth; RIGU = residual intake and gain adjusted for ultrasound fat depth.