Table 2. The distribution status of early-feathering and late-feathering chickens according to chicken breeds, and comparison between feathering phenotypes and the results of PCR using ev21-related K-specific primers.

Chicken breeds	Feathering phenotypes1	No. of chicks2	PCR result3		Concordance rate between phenotypes and PCR results (%)
			+	−
Korean Native Chicken-Red strain	EF	100	0	100	100
	LF	54	53	1	98
Korean Native Chicken-Yellow strain	EF	20	0	20	100
White Leghorn	EF	30	0	30	100
Black Cornish	EF	20	0	20	100
	LF	20	20	0	100
Rhode Island Red	EF	20	0	20	100
	LF	20	20	0	100
Korean Ogye	EF	20	0	20	100

“EF” denotes early-feathering chickens, while “LF” signifies late-feathering chickens.
The number of chicks includes both males and females.
In the PCR results, a ‘+’ indicates the presence of a positive band at 230 bp, while ‘−’ indicates the absence of a band.