Table 2. Effect of beak-trimming and genetic combinations on survival rate in Korean native chickens

Debeaking	Breeds	No. of chickens	Survival rate(%)
Debeaked	YDYC	18	94.4±5.7^a
	YDCF	26	84.6±15.8^ab
	YDCK	18	88.9±0.0^ab
	YCCK	24	78.4±11.4^bc
	CKCF	18	94.4±5.7^a
	YCCF	18	94.4±5.7^a
Non-debeaked	YDYC	27	75.8±20.9^bc
	YDCF	27	81.5±14.1^abc
	YDCK	18	66.7±34.3^c
	YCCK	18	88.9±0.0^ab
	CKCF	18	83.3±5.7^ab
	YCCF	18	44.4±11.4^d
P-value			<0.0001
Debeaked(D) and non-debeaked(ND)
D		122	88.8±11.2^a
ND		126	74.1±22.5^b
P-value			<0.0001
Breed(B)
YDYC		45	82.4±19.3^ab
YDCF		53	83.0±14.9^ab
YDCK		36	77.8±26.4^bc
YCCK		42	83.3±9.8^ab
CKCF		36	88.9±8.0^a
YCCF		36	69.4±26.9^c
P-value			<0.0001
D×B			<0.0001

The different letters of superscript within the column significantly differ (P<0.01).