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. 2019 Oct 9;97(11):4445–4452. doi: 10.1093/jas/skz314

Table 3.

Estimates of variance components and heritability (h2) of birth weight (BW), weaning weight (WW), yearling weight (YW) using linear models, and teat and udder scores (TS9, US9, TS7, US7, TS2, US2) using linear models and threshold models

Trait σ 2cg ± PSD1 σ 2a ± PSD2 σ 2e ± PSD2 h 2 ± PSD2
Performance traits Linear models
 BW 6.49 ± 1.20 40.06 ± 3.12 39.97 ± 1.83 0.43 ± 0.03
 WW 177.99 ± 72.98 1,469.30 ± 113.43 2,072.60 ± 78.89 0.20 ± 0.19
 YW 11,590.0 ± 1,321.3 2,533.90 ± 350.72 6,132.90 ± 278.92 0.18 ± 0.03
Teat and udder scores4 Linear models
 Teat score, TS9 0.16 ± 0.11 0.53 ± 0.09 0.93 ± 0.08 0.32 ± 0.06
 Udder score, US9 0.42 ± 0.27 0.22 ± 0.06 0.89 ± 0.06 0.15 ± 0.04
 Teat score, TS7 0.15 ± 0.11 0.52 ± 0.09 0.88 ± 0.07 0.34 ± 0.05
 Udder score, US7 0.41 ± 0.26 0.20 ± 0.05 0.85 ± 0.05 0.14 ± 0.04
Teat and udder scores Threshold models
 Teat score, TS9 0.18 ± 0.14 0.30 ± 0.14 2.19 ± 0.25 0.11 ± 0.05
 Udder score, US9 0.38 ± 0.28 0.45 ± 0.14 2.10 ± 0.28 0.15 ± 0.05
 Teat score, TS7 1.39 ± 1.10 4.14 ± 0.92 7.55 ± 2.35 0.33 ± 0.09
 Udder score, US7 3.21 ± 2.19 2.45 ± 0.61 8.71 ± 1.48 0.17 ± 0.05
 Teat score, TS2 0.19 ± 0.22 0.33 ± 0.33 1.00 ± 0.05 0.18 ± 0.14
 Udder score, US2 0.33 ± 0.29 0.52 ± 0.37 1.00 ± 0.05 0.26 ± 0.12

1σ 2cg = contemporary group variance ± posterior standard deviation, PDS.2σ 2a = additive genetic variance ± posterior standard deviation, PDS.3σ 2e = residual variance ± posterior standard deviation, PDS.4TS9 = teat score on a 1 to 9 scale; US9 = udder score on a 1 to 9 scale; TS7 = teat score on a 1 to 7 scale; US7 = udder score on a 1 to 7 scale; TS2 = teat score on a 1 to 2 binary scale; US2 = udder score on a 1 to 2 binary scale.