Table 2. Antioxidant enzyme activity (units/g meat) of Korean native chickens during refrigerated storage

Enzyme	Meat part	Storage time (d)	Yeonsan ogye	Hyunin black	Hoengseong yakdak	Hwangbong	SEM
Catalase	Breast	0	72.04x	70.38x	73.77x	69.14x	0.45
		5	51.59y	55.61y	49.68y	57.96y	0.84
		10	41.40y	48.55y	49.01y	36.29y	1.37
		Mean	55.01	58.18	57.49	54.46
		SEM	6.98	4.98	6.31	7.47
	Thigh	0	118.07x	133.07x	131.11x	125.70x	1.50
		5	83.84y	101.06y	101.97y	115.73y	2.92
		10	77.52y	81.97y	69.02y	50.97y	3.06
		Mean	93.14	105.37	100.70	97.47
		SEM	9.76	11.55	13.89	18.14
SOD	Breast	0	148.00x	137.33x	124.00x	148.00x	2.55
		5	101.33y	77.33y	80.00y	98.67y	2.78
		10	68.57y	61.71y	73.14y	68.57y	1.05
		Mean	105.97	92.13	92.38	105.08
		SEM	17.85	17.85	12.34	17.93
	Thigh	0	157.33x	146.67x	144.00x	172.00x	2.84
		5	114.67y	104.00y	112.00y	112.00y	1.03
		10	70.86y	68.57y	91.43y	98.29y	3.31
		Mean	114.29b	106.41b	115.81b	127.43a
		SEM	19.34	17.49	11.85	17.53
GSH-Px	Breast	0	0.30x	0.32x	0.27x	0.37x	0.01
		5	0.19y	0.19y	0.23x	0.21y	0.004
		10	0.12y	0.13y	0.13y	0.11y	0.002
		Mean	0.20	0.21	0.21	0.23
		SEM	0.04	0.04	0.03	0.06
	Thigh	0	0.62x	0.74x	0.54x	0.59x	0.02
		5	0.39y	0.45y	0.23y	0.31y	0.02
		10	0.13z	0.14z	0.12y	0.13z	0.003
		Mean	0.38ab	0.45a	0.30b	0.34b
		SEM	0.11	0.13	0.10	0.10