TABLE 2.

Descriptive analysis of the set of heritability (h²) estimates for each trait and the p‐value of the Shapiro–Wilk test.

Trait	Number of studies	Number of animals a	Min. Sample size	Max. Sample size	Min.	Max.	Average h2 ± standard error	p‐Value
Flight score at weaning	6	5228	424	2178	0.11	0.36	0.23 ± 0.03	0.9785
Flight speed at weaning	9	17,690	494	4645	0.12	0.54	0.29 ± 0.04	0.1128
Flight speed at yearling	10	47,500	302	16,801	0.17	0.49	0.28 ± 0.03	0.1342
Movement score	11	41,501	250	16,874	0.08	0.29	0.17 ± 0.02	0.0607
Crush score at weaning	15	163,100	350	50,935	0.03	0.46	0.24 ± 0.03	0.4005
Pen score at weaning	9	13,694	206	6132	0.14	0.61	0.37 ± 0.06	0.5407
Pen score at yearling	9	293,926	250	189,347	0.11	0.29	0.19 ± 0.02	0.7162
Cow's aggressiveness at calving	5	11,991	578	5881	0.06	0.42	0.16 ± 0.06	0.1889
Milking temperament	11	3,752,645	1212	1,940,092	0.04	0.33	0.15 ± 0.03	0.3173
General temperament	10	222,484	2312	126,614	0.04	0.38	0.14 ± 0.03	0.0585

^a It is the sum of animals from all studies.