Table 4. Comparison of viability between crossbred Korean native chickens and Hy-Line Brown from weeks 18 to 64

Treatment1	Viability (%)
	CFCK	CFYC	CFYD	CKCF	CKYC	CKYD	YCCF	YCCK	YCYD	YDCF	YDCK	YDYC	Hy-Line Brown
Week 18	100	100	100	100	100	100	100	100	100	100	100	100	100
Week 20	100	100	100	100	100	100	100	100	100	100	100	100	100
Week 24	92	100	96	100	100	96	94	96	100	95	95	100	100
Week 28	88	95	92	100	95	87	88	87	93	91	86	100	100
Week 32	88	95	92	100	95	87	88	78	89	91	77	94	100
Week 36	88	95	92	100	95	83	88	78	89	91	77	94	100
Week 40	88	91	92	100	95	83	88	74	86	91	77	94	100
Week 44	88	91	88	100	95	83	88	74	86	91	73	94	97
Week 48	84	91	88	100	95	74	88	74	86	91	73	94	97
Week 52	84	91	88	57	95	61	88	74	86	91	64	94	97
Week 56	84	77	88	57	95	61	88	74	86	91	64	94	97
Week 60	84	77	88	57	95	61	88	74	86	86	64	94	95
Week 64	84	77	88	57	95	61	88	74	86	82	64	94	95

C, D: Korean Rhode Island; F, K: Korean Leghorn; Y: Korean domestic chicken.