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Table 4 Estimates of genetic (co)variances of traits and their respective DGV for Limousin and Simmental animals

From: Accuracy of direct genomic breeding values for nationally evaluated traits in US Limousin and Simmental beef cattle

Trait Limousin Simmental
  σ α 1 2 σ α 2 2 σ α 1 α 2 σ α 1 2 σ α 2 2 σ α 1 α 2
Birth weight (kg) 2.80 0.93 0.93 3.49 1.29 1.39
Calving ease direct (%) 55.92 11.46 13.12 108.62 29.90 25.72
Calving ease maternal (%) 78.12 25.91 22.97 118.60 28.24 18.50
Carcass weight (kg) 107.82 25.67 29.67 122.07 30.87 36.49
Docility (%) 423.76 84.86 75.85 - - -
Fat thickness (mm) - - - 7.10 1.29 0.64
Marbling (units) 0.009 0.002 0.003 0.145 0.051 0.054
Rib eye muscle area (cm2) 5.00 1.53 1.73 12.82 4.16 4.33
Scrotal circumference (mm) 831.28 154.71 162.65 - - -
Shear force (kg) - - - 0.085 0.021 0.022
Stayability (%) 93.07 11.91 12.96 114.30 28.00 32.90
Weaning weight direct (kg) 68.08 18.76 20.80 75.14 18.01 19.13
Weaning weight maternal (kg) 26.00 2.83 3.94 53.37 10.14 7.86
Yield grade (units) 0.018 0.005 0.006 0.073 0.026 0.027
Yearling weight (kg) 111.76 22.82 38.44 726.42 61.77 96.28
  1. σ α 1 2 is the additive genetic variance of trait, σ α 2 2 is the additive genetic variance of DGV as a proportion of trait additive genetic variance) and σ α 1 α 2 is the genetic covariance between the trait and its DGV.