Table 1.

Summary of the three Yorkshire populations, numbers of genotyped animals, and estimates of heritability (${\text{h}}^2$)

Populationa (number of animals in the pedigree)	Origin	Trait	N-obs	Birth year	Genotyped animals	${\text{h}}^2$ (SE)
LM (72,998)	USA	NBA	5907/19,660	2004–2016	1641	0.08 (0.01)
		TNB	5907/19,660		1641	0.09 (0.01)
		AGE	28,827	2007–2016	1769	0.38 (0.02)
		BFT	28,827		1769	0.36 (0.02)
XD (51,964)	UK	NBA	4842/18,369	2004–2015	762	0.07 (0.01)
		TNB	4842/18,369		762	0.07 (0.01)
ZX (16,914)	USA	AGE	6721	2012–2016	320	0.19 (0.03)
		BFT	6721		320	0.24 (0.03)

NBA number of piglets born alive, TNB total number of piglets born, AGE days to 100 kg, BFT backfat thickness, N-obs number of individuals/observations

^aYorkshire populations from three Chinese pig breeding farms