Table 3. Effect of beak-trimming and genetic combinations on body weight in Korean native chickens

Debeaking	Breeds	Birth	Week 4	Week 8	Week 12	Week 20
-------------- g ---------------
Debeaked	YDYC	39.8±3.7^b	278.1±24.4^abcde	839.0±87.5^ab	1,266.8±138.6^a	2,110.9±261.2^a
	YDCF	45.2±4.4^a	254.1±41.6^e	750.2±114.1^bc	1,195.2±214.5^ab	1,838.9±193.5^bc
	YDCK	45.5±2.9^a	271.8±24.0^cde	810.0±62.2^abc	1,170.6±97.7^ab	1,874.5±211.6^abc
	YCCK	44.3±2.9^a	258.3±25.9^de	790.3±65.2^abc	1,204.5±128.7^ab	1,910.5±230.3^abc
	CKCF	45.7±3.3^a	274.5±38.7^bcde	744.0±121.4^c	1,106.2±177.7^b	1,814.7±287.1^c
	YCCF	42.6±3.0^ab	286.9±25.4^abcde	832.1±76.2^abc	1,152.3±112.9^ab	1,883.8±219.4^abc
Non-debeaked	YDYC	40.4±3.1^b	276.9±22.4^bcde	849.5±63.0^a	1,243.2±98.7^a	2,059.7±446.7^ab
	YDCF	42.9±3.4^ab	289.6±28.8^abcd	840.8±65.1^ab	1,171.1±97.0^ab	1,893.9±416.7^abc
	YDCK	45.5±2.8^a	307.2±38.0^ab	864.8±91.1^a	1,243.7±128.8^a	1,994.8±222.1^abc
	YCCK	45.8±3.4^a	272.7±31.5^cde	835.2±87.2^ab	1,204.5±128.7^ab	1,935.3±262.6^abc
	CKCF	45.9±3.4^a	310.8±34.4^a	829.9±72.7^abc	1,215.0±101.7^ab	1,896.2±198.5^abc
	YCCF	44.3±2.8^a	298.2±28.4^abc	863.2±88.9^a	1,243.1±126.1^a	1,946.2±275.6^ab
P-value		<0.0001	<0.0001	<0.0001	0.0038	0.0009
Debeaked(D) and non-debeaked(ND)
D		-	269.3±32.8^b	792.1±95.2^b	1,175.9±173.6^b	1,900.6±245.9
ND		-	291.6±32.7^a	847.2±76.4^a	1,219.5±119.5^a	1,962.4±119.5
P-value			<0.0001	<0.0001	0.0234	0.1277
Breed(B)
YDYC		40.1±3.4^c	277.4±23.0^abc	845.2±73.3^ab	1,251.3±132.4^a	2,077.8±376.9^a
YDCF		44.2±4.1^ab	269.9±40.2^bc	790.5±104.9^bc	1,182.9±251.0^ab	1,866.9±307.6^b
YDCK		45.5±2.8^ab	286.6±34.9^ab	832.2±78.9^abc	1,203.5±120.9^ab	1,928.6±224.3^b
YCCK		44.9±3.2^ab	264.3±28.8^c	807.6±76.6^abc	1,177.8±104.3^ab	1,920.5±241.9^b
CKCF		45.8±3.3^a	292.6±40.5^a	786.9±107.8^c	1,162.2±128.7^b	1,855.4±250.2^b
YCCF		43.5±3.0^b	292.6±27.1^a	847.6±83.1^a	1,197.7±137.9^ab	1,915.0±247.5^b
P-value		<0.0001	<0.0001	0.0019	0.0258	<0.0001
D×B		0.0940	0.0272	0.2462	0.0686	0.6563

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