Table 1.

Variance components and heritability (±standard error; SE) of growth traits between the on-site farm and on-station Thai native chickens (Pradu Hang dum).

Research Sites	Traits	Parameters
		${\mathit{\sigma }}_{\mathit{a}}^2$	${\mathit{\sigma }}_{\mathit{e}}^2$	${\mathit{h}}^2\left(\mathit{S}\mathit{E}\right)$
On-site farm	BW0	5.26	5.28	0.499 ± 0.001
	BW4	632.21	729.15	0.464 ± 0.002
	BW8	3055.07	4691.28	0.394 ± 0.005
	BW12	4199.35	13,560.11	0.236 ± 0.007
	BW16	8541.00	26,410.00	0.244 ± 0.007
	ADG0–4	0.81	2.12	0.276 ± 0.002
	ADG4–8	1.01	2.56	0.283 ± 0.003
	ADG8–12	1.60	4.10	0.281 ± 0.009
	ADG12–16	1.95	5.17	0.274 ± 0.015
	BrC8	0.30	0.82	0.268 ± 0.013
	BrC12	0.42	1.25	0.251 ± 0.021
	BrC16	0.46	1.79	0.204 ± 0.004
On-station	BW0	3.21	3.22	0.499 ± 0.001
	BW4	746.00	757.20	0.496 ± 0.001
	BW8	3143.15	4474.13	0.413 ± 0.001
	BW12	5422.22	11,675.41	0.317 ± 0.002
	BW16	9245.42	22,480.20	0.291 ± 0.005
	ADG0–4	0.85	2.00	0.298 ± 0.033
	ADG4–8	1.18	2.59	0.313 ± 0.046
	ADG8–12	1.85	4.09	0.311 ± 0.008
	ADG12–16	2.30	5.22	0.306 ± 0.021
	BrC8	0.40	0.95	0.296 ± 0.021
	BrC12	0.55	1.12	0.291 ± 0.016
	BrC16	0.64	1.66	0.278 ± 0.011

On-site farm = farmer’s farms; On-station = Khon Kaen University experimental farm; BW0, BW4, BW8, BW12, and BW16 = birth weight, body weight at 4, 8, 12, 14 and 16 weeks of age, respectively; ADG0–4, ADG4–8, ADG8–12, and ADG12–16 = average daily gain (g/day) during 0–4, 4–8, 8–12, and 12–16 weeks of age, respectively; BrC8, BrC12, and BrC16 = breast circumference (cm) at 8, 12, and 16 weeks of age, respectively; ${\sigma }_a^2=$ additive genetic variances; ${\sigma }_e^2=$ residual variances; $h^2=$ heritability.