Table 3.

Effects of free-range days on carcass traits of Wannan Yellow chickens.¹

	Free-range days
Items (%)	0	14	28	42	SEM2	Significance	Linear	Quadratic
Slaughter yield	92.80	93.02	92.09	92.15	0.002	0.068	0.069	0.801
Eviscerated carcass yield	70.89	72.12	70.84	69.46	0.013	0.100	0.202	0.512
Breast yield	14.30a	14.60a	15.77b	16.34c	0.022	0.025	0.034	0.468
Thigh yield	15.52	16.39	16.26	16.06	0.013	0.297	0.372	0.108
Wing yield	12.64	11.98	11.73	11.90	0.011	0.211	0.110	0.181
Leg yield	29.62a	29.78a	27.48b	27.44b	0.130	0.017	0.013	0.866
Abdominal fat yield	1.38a	1.21a	0.89b	0.90b	0.001	0.019	0.025	0.173
Head yield	5.69	5.29	5.61	5.51	0.008	0.251	0.795	0.373
Foot yield	7.38a	6.86a,b	6.26b	6.05c	0.022	0.003	0.031	0.455
Lung yield	1.07	1.01	1.01	1.03	0.021	0.496	0.463	0.185

¹Data are means of 6 replicates of 8 chickens each.

²Pooled standard error of the mean.

^a−cMeans within a row lacking a common superscript differ significantly (P < 0.05).