Table 6. Effect of beak-trimming and genetic combinations on feather damage score in Korean native chickens

Debeaking	Breed	Week 20	Week 30	Week 40	Week 50
Debeaked	YDYC	1.00±0.00^b	1.11±0.12^d	1.34±0.27^d	1.83±0.49^def
	YDCF	1.00±0.00^b	1.13±0.22^cd	1.52±0.44^bcd	1.65±0.51^ef
	YDCK	1.00±0.00^b	1.21±0.19^cd	1.62±0.37^bcd	1.82±0.52^def
	YCCK	1.00±0.00^b	1.11±0.13^d	1.36±0.30^d	1.68±0.46^ef
	CKCF	1.00±0.00^b	1.10±0.16^d	1.28±0.27^d	1.54±0.37^f
	YCCF	1.00±0.00^b	1.11±0.14^d	1.57±0.41^bcd	2.06±0.46^bdef
Non-debeaked	YDYC	1.01±0.05^b	1.18±0.18^cd	1.95±0.58^abc	2.33±0.58^abcd
	YDCF	1.00±0.00^b	1.43±0.20^ab	2.16±0.49^a	2.58±0.47^abc
	YDCK	1.08±0.16^a	1.45±0.30^ab	2.38±0.47^a	2.55±0.50^abc
	YCCK	1.00±0.00^b	1.19±0.14^cd	2.05±0.42^ab	2.23±0.44^bcde
	CKCF	1.00±0.00^b	1.59±0.33^a	2.38±0.62^a	2.67±0.54^ab
	YCCF	1.00±0.00^b	1.33±0.26^bc	2.36±0.87^a	2.87±0.83^a
P-value		<0.001	<0.001	<0.001	<0.001
Debeaked(D) and non-debeaked(ND)
D		1.00±0.00^b	1.13±0.17^b	1.45±0.37^b	1.76±0.49^b
ND		1.01±0.07^a	1.34±0.27^a	2.18±0.60^a	2.50±0.58^a
P-value		0.0103	<0.001	<0.001	<0.001
Breed(B)
YDYC		1.01±0.04^ab	1.15±0.16^b	1.71±0.57	2.13±0.59^ab
YDCF		1.00±0.00^b	1.28±0.26^a	1.85±0.56	2.12±0.67^ab
YDCK		1.04±0.11^a	1.29±0.26^a	1.89±0.55	2.09±0.62^ab
YCCK		1.00±0.00^b	1.14±0.14^b	1.64±0.49	1.91±0.52^b
CKCF		1.00±0.00^b	1.34±0.35^a	1.81±0.73	2.07±0.72^ab
YCCF		1.00±0.00^b	1.21±0.23^ab	1.93±0.76	2.39±0.75^a
P-value		0.0016	<0.001	0.0826	0.0153
D×B		0.0003	<0.001	0.2706	0.088

The different letters of superscript within the column significantly differ (P<0.05).