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Table 3 Validation of parent index (PI) and genomic breeding values (GBV) using Dutch/Flemish (NDL_ref) and EuroGenomic (EU_ref) reference populations

From: A common reference population from four European Holstein populations increases reliability of genomic predictions

Trait Number of bulls Dutch/Flemish reference EuroGenomic reference
  NLD_ref EU_ref valid RELPI b0g b1 RELGBV-PI RELPI b0g 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
  1. *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