Table 6. Comparison of egg quality between crossbred Korean native chickens and Hy-Line Brown from 24 to 64 week after hatching

Period	Treatment¹													SEM²	P-value
Period	CFCK	CFYC	CFYD	CKCF	CKYC	CKYD	YCCF	YCCK	YCYD	YDCF	YDCK	YDYC	Hy-Line Brown	SEM²	P-value
Week 24
Egg weight (g)	47.90^a	54.45^b	56.06^bc	61.98^de	48.72^a	56.29^bc	59.17^bcd	58.08^bcd	56.17^bc	59.80^cde	57.81^bcd	55.84^bc	64.38^e	0.275	<0.001
Eggshell color	47.70^cde	53.70^efg	51.40^def	50.10^def	47.50^cde	48.80^cde	57.70^g	38.70^bc	47.00^cd	52.30^defg	56.10^fg	43.80^bc	24.50^a	0.362	<0.001
Eggshell thickness (mm)	0.300^b	0.323^g	0.307^c	0.324^g	0.318^f	0.309^cd	0.310^d	0.302^b	0.315^e	0.309^cd	0.309^cd	0.295^a	0.375^h	0.0002	<0.001
Eggshell strength (kg)	4.29^a	4.52^cd	4.26^a	4.46^bc	4.54^cd	4.51^c	4.62^de	4.67^e	4.52^cd	4.40^b	4.53^cd	4.29^a	5.92^f	0.006	<0.001
Yolk color	7.3	7.6	7.8	7.6	7.7	7.7	7.7	7.9	7.6	7.6	7.8	7.5	7.3	0.042	0.176
Week 32
Egg weight (g)	56.49^a	58.29^a	56.33^a	64.26^bc	56.46^a	57.20^a	60.35^abc	59.61^ab	56.18^a	57.17^a	57.98^a	56.97^a	65.87^c	0.339	<0.001
Eggshell color	50.40^cd	55.00^d	48.10^bcd	50.80^cd	45.50^bcd	50.60^cd	47.00^bcd	51.90^d	37.10^b	44.20^bcd	44.80^bcd	39.40^bc	24.10^a	0.663	<0.001
Eggshell thickness (mm)	0.312^a	0.306^a	0.299^a	0.330^a	0.328^a	0.317^a	0.314^a	0.299^a	0.313^a	0.309^a	0.327^a	0.299^a	0.374^b	0.0022	<0.001
Eggshell strength (kg)	4.66^a	4.33^a	4.34^a	4.70^a	4.62^a	4.61^a	4.69^a	4.70^a	4.69^a	4.57^a	4.91^a	4.42^a	6.00^b	0.050	<0.001
Yolk color	7.1	7.6	7.2	7.3	7.7	7.5	7.5	7.7	7.9	7.8	7.6	8.0	7.1	0.061	0.057

Values in a row with different superscripts differ significantly (P<0.05).
C, D: Korean Rhode Island; F, K: Korean Leghorn; Y: Korean domestic chicken.
SEM, standard error of the means.