Table 3.
Variance component and heritability estimates (SE) using univariate models for growth, feed efficiency, and carcass traits in Angus cattle
| Parameter1 | ||||||
|---|---|---|---|---|---|---|
| Trait2 | σ2a | σ2m | σ2e | σ2p | h2a | h2m |
| BWT | 6.25 ± 0.90 | 2.37 ± 0.47 | 10.38 ± 0.63 | 19.00 ± 0.40 | 0.33 ± 0.04 | 0.12 ± 0.02 |
| 200dWT | 63.48 ± 12.81 | 111.95 ± 11.37 | 276.18 ± 12.57 | 451.61 ± 9.01 | 0.14 ± 0.03 | 0.25 ± 0.02 |
| 400dWT | 219.70 ± 42.25 | – | 622.74 ± 38.58 | 842.44 ± 22.36 | 0.26 ± 0.05 | – |
| 600dWT | 603.63 ± 81.59 | – | 655.99 ± 65.58 | 1,259.60 ± 34.78 | 0.48 ± 0.06 | – |
| ADG | 0.03 ± 0.01 | – | 0.05 ± 0.01 | 0.08 ± 0.00 | 0.33 ± 0.07 | – |
| MMWT | 10.28 ± 1.81 | – | 11.83 ± 1.53 | 22.11 ± 0.77 | 0.46 ± 0.07 | – |
| FI | 1.14 ± 0.18 | – | 0.94 ± 0.15 | 2.07 ± 0.07 | 0.55 ± 0.08 | – |
| FCR | 0.71 ± 0.22 | – | 2.83 ± 0.22 | 3.54 ± 0.12 | 0.20 ± 0.06 | – |
| RFI | 0.52 ± 0.10 | – | 0.78 ± 0.09 | 1.30 ± 0.04 | 0.40 ± 0.07 | – |
| RG | 0.01 ± 0.00 | – | 0.05 ± 0.00 | 0.06 ± 0.00 | 0.19 ± 0.06 | – |
| CEMA | 31.34 ± 5.87 | – | 28.63 ± 4.85 | 59.97 ± 2.36 | 0.52 ± 0.09 | – |
| IMF | 5.60 ± 0.99 | – | 3.56 ± 0.80 | 9.16 ± 0.40 | 0.61 ± 0.09 | – |
| CRIB | 8.83 ± 2.22 | – | 16.87 ± 1.97 | 25.69 ± 0.98 | 0.34 ± 0.08 | – |
| P8FAT | 16.62 ± 3.01 | – | 13.63 ± 2.46 | 30.25 ± 1.20 | 0.55 ± 0.09 | – |
| CWT | 740.85 ± 122 | – | 384.22 ± 96.93 | 1,125.10 ± 46.15 | 0.66 ± 0.09 | – |
1σ2a = additive genetic variance; σ2m = maternal genetic variance; σ2e = residual variance; σ2p = phenotypic variance; h2a = additive heritability; h2m = maternal heritability.
2BWT = birth weight; 200dWT = 200-d weight; 400dWT = 400-d weight; 600dWT = 600-d weight; ADG = average daily gain; MMWT = metabolic midweight; FI = feed intake; FCR = feed conversion ratio; RFI = residual feed intake; RG = residual gain; CEMA = carcass eye muscle area; IMF = carcass intramuscular fat; CRIB = subcutaneous fat depths at the 12th/13th rib; P8FAT = rump P8 fat depth; CWT = carcass weight.