Table 1.
Summary statistics for carcass traits and their real-time ultrasound live indicators
| Data source1 | Carcass2 | Ultrasound3 | Weight4 | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Item | FAT (mm)5 | LMA (cm2) | MRB6 | UFAT (mm) | ULMA (cm2) | UIMF (%) | BWT (kg) | CWT (kg) | |
| AHA | Minimum | 1.78 | 53.16 | 0.61 | 1.02 | 25.94 | 0.25 | 22.07 | 200.99 |
| Mean | 14.55 | 81.81 | 4.09 | 5.46 | 61.55 | 3.38 | 38.99 | 362.24 | |
| Maximum | 35.31 | 131.03 | 8.54 | 20.32 | 106.77 | 8.72 | 59.60 | 495.78 | |
| SD | 4.60 | 8.90 | 1.00 | 2.49 | 14.32 | 0.96 | 4.42 | 40.89 | |
| No. of siresg | 423 | ||||||||
| No. of records | 6,054 | 6,074 | 12,128 | 6,054 | |||||
| No. of Contemporary Groups | 348 | 528 | 679 | 348 | |||||
| ASA | Minimum | 1.02 | 11.61 | 0.21 | 1.02 | 40.00 | 0.50 | 13.61 | 171.91 |
| Mean | 12.02 | 83.87 | 5.32 | 5.01 | 78.32 | 3.27 | 39.14 | 359.06 | |
| Maximum | 35.56 | 150.79 | 10.80 | 21.59 | 131.61 | 7.85 | 64.41 | 553.38 | |
| SD | 4.06 | 10.32 | 1.10 | 1.85 | 12.84 | 0.90 | 5.59 | 47.04 | |
| No. of sires7 | 1358 | ||||||||
| No. of records | 9,056 | 7,753 | 16,809 | 9,056 | |||||
| No. of Contemporary Groups | 819 | 324 | 741 | 819 | |||||
1
Data Source: AHA, American Hereford Association; ASA, American Simmental Association.
2
Carcass traits: FAT, back fat thickness; LMA, longissimus muscle area; MRB, marbling score.
3
Ultrasound traits: UFAT, real time ultrasound (RTU) fat thickness; ULMA, RTU longissimus muscle area; UIMF, RTU intramuscular fat percentage.
4
Weights: BWT, birth weight; CWT, carcass weight.
5
Unit conversions were undertaken from imperial to metric for all the traits except MRB and UIMF.
6
MRB for AHA was scored on the graders scale and divided by 100, whereas for ASA marbling was scored according to BIF guidelines.
7
Number of sires of individuals with phenotypic records.