Table 4.
Genetic gains of milk yield (kg) per year by the selection method and group
| Groups | Parity | σa | i | rGPssBLUP( rGPBLUP) | L | ΔG1(ΔG2) | IR |
|---|---|---|---|---|---|---|---|
| Cows with record | 1 | 669 | 0.2 | 0.72(0.67) | 4.2 | 23.0 (21.4) | 7.5 |
| 2 | 709 | 0.2 | 0.70(0.66) | 4.2 | 23.6 (22.2) | 6.7 | |
| 3 | 681 | 0.2 | 0.69(0.64) | 4.2 | 22.2 (20.8) | 7.1 | |
| Mean | 7.1 | ||||||
| Sires with progeny | 1 | 669 | 2.06 | 0.87(0.84) | 8.1 | 147.4 (143.4) | 2.8 |
| 2 | 709 | 2.06 | 0.84(0.81) | 8.1 | 150.9 (146.6) | 3.0 | |
| 3 | 681 | 2.06 | 0.82(0.80) | 8.1 | 142.9 (138.6) | 3.1 | |
| Mean | 2.9 | ||||||
| Heifers without record | 1 | 669 | 0.2 | 0.62(0.50) | 4.2 | 19.6 (15.9) | 23.3 |
| 2 | 709 | 0.2 | 0.60(0.48) | 4.2 | 20.3 (16.2) | 25.1 | |
| 3 | 681 | 0.2 | 0.58(0.47) | 4.2 | 18.9 (15.2) | 24.3 | |
| Mean | 24.2 | ||||||
| Sires without progeny | 1 | 669 | 2.06 | 0.62(0.47) | 8.1 | 106.3 (79.8) | 33.1 |
| 2 | 709 | 2.06 | 0.61(0.45) | 8.1 | 109.7 (80.7) | 36.0 | |
| 3 | 681 | 2.06 | 0.59(0.44) | 8.1 | 102.5 (75.5) | 35.7 | |
| Mean | 35.0 |
σa, genetic standard deviation; i, selection intensity; rGPssBLUP( rGPBLUP), accuracy; L, generation interval; ΔG1 = ssBLUP (ΔG2 = BLUP), genetic gain; IR, increase rate (%).