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

Treatment1	Survivability (%)
	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	100	100	100	100	100	100	100	100	100	100	100	100	100
Week 28	100	100	100	100	100	100	100	100	100	100	100	100	100
Week 32	100	100	100	100	90	100	100	100	100	100	100	100	100
Week 36	100	100	100	100	90	100	100	100	100	100	100	100	100
Week 40	100	100	100	100	90	100	100	100	100	100	100	100	100
Week 44	100	100	100	100	90	100	100	100	100	100	100	100	100
Week 48	100	100	100	100	90	100	90	90	100	100	100	100	100
Week 52	100	80	90	80	80	80	90	90	100	100	100	100	100
Week 56	100	80	90	80	80	80	90	90	100	100	100	100	100
Week 60	100	80	70	70	80	70	80	60	90	100	90	100	100
Week 64	90	80	70	70	70	70	80	60	90	100	90	90	90

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