Table 1.
Simple statistics for carcass grading traits, image analysis traits and unit price (mean±standard deviation)
| Traits | Steer (n = 1,216) | Heifer (n = 591) |
|---|---|---|
| Carcass grading traits | ||
| CWT (kg) | 491.9±54.2 | 452.8±53.4 |
| REA (cm2) | 62.7±11.0 | 59.7±9.7 |
| RT (mm) | 78.6±9.1 | 78.4±9.1 |
| SFT (mm) | 23.0±6.8 | 28.9±8.1 |
| YS (%) | 74.6±1.6 | 74.1±1.5 |
| BMS | 7.5±2.3 | 6.8±2.2 |
| M. longissimus dorsi | ||
| Area (cm2) | 62.0±10.9 | 59.4±9.7 |
| Marbling percentage (%) | 51.8±7.7 | 50.0±7.6 |
| New fineness index | 89.9±12.1 | 88.2±11.6 |
| Coarseness index (%) | 15.7±4.9 | 15.9±5.0 |
| M. semispinalis capitis | ||
| Area (cm2) | 14.6±2.8 | 11.7±2.8 |
| Marbling percentage (%) | 40.8±7.3 | 40.5±6.7 |
| New fineness index | 65.5±11.4 | 58.5±11.2 |
| Coarseness index (%) | 2.1±1.9 | 2.1±1.8 |
| M. semispinalis dorsi | ||
| Area (cm2) | 39.3±6.7 | 36.5±5.5 |
| Marbling percentage (%) | 49.4±6.7 | 48.6±6.0 |
| New fineness index | 94.8±15.1 | 90.7±13.3 |
| Coarseness index (%) | 8.3±3.1 | 8.9±3.2 |
| M. trapezius dorsi | ||
| Area (cm2) | 53.3±12.0 | 46.1±8.9 |
| Marbling percentage (%) | 44.4±7.7 | 36.8±7.1 |
| Thickness (mm) | 36.4±7.2 | 33.6±5.7 |
| New fineness index | 82.9±15.3 | 71.8±14.8 |
| Coarseness index (%) | 13.2±4.0 | 12.7±3.9 |
| M. latissimus dorsi | ||
| Area (cm2) | 44.2±10.0 | 39.3±8.4 |
| Marbling percentage (%) | 46.0±8.3 | 40.2±8.0 |
| Thickness (mm) | 35.9±6.1 | 32.9±5.2 |
| New fineness index | 77.2±11.4 | 75.0±12.6 |
| Coarseness index (%) | 12.0±4.1 | 10.6±3.9 |
| Target field | ||
| Area (cm2) | 560.0±64.0 | 533.9±62.7 |
| Thickness (mm) | 234.0±24.6 | 239.4±24.8 |
| IF area (cm2) | 102.1±16.8 | 98.2±16.9 |
| IF area percentage (%) | 18.2±2.3 | 18.4±2.5 |
| SF area (cm2) | 75.7±20.9 | 88.4±23.7 |
| SF area percentage (%) | 13.4±3.0 | 16.4±3.3 |
| Price | ||
| UP (yen) | 2,261±264.0 | 2,180±254.5 |
CWT, carcass weight; REA, rib eye area; RT, rib thickness; SFT, SF thickness; YS, yeild score; BMS, beef marbling standard; IAT, image analysis traits; IF, intermuscular fat; SF, subcutaneous fat; UP, carcass unit price per 1 kg.