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Table 6 Phenotypic and additive genetic variance; accuracies of DGV and regressions of DEBV on DGV

From: Accuracies of genomic breeding values in American Angus beef cattle using K-means clustering for cross-validation

    K-means Random
Trait σ p 2 σ g 2 ρ ^ g g ^ β ^ y , x ρ ^ g g ^ β ^ y , x
Birth weight (kg) 20.63 8.67 0.554 0.879 0.700 0.953
Calving ease direct (%) 825.05 148.51 0.488 0.942 0.617 1.007
Calving ease maternal (%) 1313.37 157.6 0.416 1.181 0.571 1.277
Carcass weight (kg) 1535.06 614.03 0.471 1.130 0.689 1.208
Docility (%) 1634.60 604.8 0.218 0.614 0.490 1.150
Fat thickness (mm) 4.8 1.63 0.603 1.113 0.793 1.211
Heifer pregnancy rate (%) 1031.74 134.13 0.269 1.337 0.378 1.580
Marbling (units) 0.797 0.359 0.690 1.058 0.817 1.041
Maternal weaning weight (kg) 1160.85 162.52 0.318 0.702 0.492 0.829
Mature height (mm) 494.03 405.13 0.359 0.977 0.819 1.091
Mature weight (kg) 4638.66 2551.28 0.312 0.898 0.769 1.125
Rib eye muscle area (mm2) 430.32 219.35 0.601 0.993 0.694 0.958
Scrotal circumference (mm) 839.98 361.19 0.487 0.916 0.600 0.983
Weaning weight (kg) 1558.04 311.61 0.333 0.597 0.534 0.760
Yearling height (mm) 344.68 155.19 0.575 1.015 0.850 1.011
Yearling weight (kg) 2049.19 1004.12 0.356 0.642 0.573 0.790
  1. Phenotypic variance ( σ p 2 ) and additive genetic variance ( σ g 2 ) obtained from the primary analysis using all genotyped animals in the training set; the accuracy of DGV ( ρ ^ g ĝ ) and the regression of DEBV on DGV ( β ^ y , x ) obtained by K-means and random clustering (five replicates) along with 5-fold cross-validation for 16 traits