Table 3.
Validation of parent index (PI) and genomic breeding values (GBV) using Dutch/Flemish (NDL_ref) and EuroGenomic (EU_ref) reference populations
| Trait | Number of bulls | Dutch/Flemish reference | EuroGenomic reference | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| NLD_ref | EU_ref | valid | RELPI | b0/σg | b1 | RELGBV-PI | RELPI | b0/σg | b1 | RELGBV-PI | |
| Protein yield | 3471 | 9618 | 1115 | 0.25 | 0.02 | 0.99 | 0.23 | 0.24 | 0.01 | 0.94 | 0.28 |
| Udder depth | 3468 | 9541 | 1113 | 0.19 | -0.04 | 1.00 | 0.19 | 0.19 | -0.05 | 1.01 | 0.36 |
| SCS | 3458 | 9604 | 1107 | 0.29 | -0.05 | 1.04 | 0.19 | 0.29 | -0.06 | 1.06 | 0.27 |
| ICF* | 3472 | 9398 | 1117 | 0.35 | 0.09 | 1.03 | 0.18 | 0.33 | 0.10 | 1.03 | 0.21 |
| Average | 3467 | 9540 | 1113 | 0.27 | 0.01 | 1.02 | 0.20 | 0.26 | 0.00 | 1.01 | 0.28 |
*ICF: interval between calving and first insemination; RELPI: r2(PI, DRP)/RELDRP, DRP is deregressed proofs in the validation dataset, RELDRP is the average reliability of DRP; RELGBV-PI: the difference between RELGBV and RELPI, where RELGBV is r2(GBV, DRP)/REL(DRP); b0 is intercept and b1 is regression coefficient of DRP on GBV; σg is the genetic standard deviation