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Table 1 Validation of parent index (PI) and genomic breeding values (GBV) using Nordic (DSF_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 Nordic reference EuroGenomic reference
  DFS_ref EU_ref valid RELPI b0 b1 RELGBV-PI RELPI b0 b1 RELGBV-PI
Protein yield 3038 10701 942 0.21 2.63 0.82 0.19 0.22 1.98 0.86 0.32
Udder depth 2958 10755 948 0.12 2.80 0.98 0.29 0.13 1.70 0.90 0.42
SCS 3077 10880 947 0.21 1.27 0.99 0.19 0.22 0.44 0.94 0.32
NRR 3069 10712 942 0.29 -0.71 1.08 0.14 0.29 -1.02 0.98 0.19
Average 3035 10762 944 0.21 1.50 0.97 0.20 0.22 0.78 0.92 0.31
  1. 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