Table 3 Average genomic inbreeding coefficient (F_ROH) for different length categories of ROH across five chicken populations

	Chicken population
Length category (Mb)	Layers		Broilers		Wild birds
Length category (Mb)	WL (n= 25)	BL (n= 25)	BRA (n= 20)	BRB (n= 20)	RJF (n= 25)
F_ROH(0.3-1)	0.228	0.113	0.068	0.082	0.026
F_ROH(1-2)	0.153	0.113	0.044	0.054	0.031
F_ROH(2-4)	0.075	0.119	0.048	0.051	0.039
F_ROH(4-8)	0.009	0.075	0.022	0.022	0.034
F_ROH(8-10)	0.000	0.009	0.003	0.002	0.007
F_ROH(10-16)	0.000	0.008	0.003	0.000	0.007
F_ROH(>16)	0.000	0.001	0.000	0.000	0.001
Total F_ROH(≥0.3)	0.46	0.44	0.19	0.21	0.14
SD	0.02	0.04	0.05	0.02	0.10

F_ROH ≥0.3Mb = overall genomic inbreeding (average of individuals) at ROH threshold of 0.3 Mb, SD = standard deviation of the total F_ROH calculated based upon individual F_ROH, which has been shown in File S1.