Table 1 Description of the 9 chicken breeds used in this study

Abbr.	Breed	No. of sample	Genetic orgin	Source
YSO	Ogye	27	Korea	Jisan Farm
ARO	Ogye	27	Korea	NIAS
CBO	Ogye	27	Korea	CILVR
CNO	Ogye	27	Korea	CILER
GBO	Ogye	27	Korea	GLRI
SUO	Ogye	27	Korea	SNU
RIR	Rhode Island Red	27	USA	NIAS
LG	White Leghorn	27	Italy	NIAS
CN	Cornish	27	UK	NIAS

YSO: Yeonsan ogye, ARO: Animal Genetic Resources Research Center Ogye, CBO: Chungbuk Ogye, CNO: Chungnam Ogye, GBO: Gyengbuk Ogye, SUO: Seoul National University Ogye, RIR: Rhode Island Red, LG: White Leghorn, CN: Cornish.NIAS: National Institute of Animal Science.CILVR: Chungbuk Institute of Livestock and Veterinary Research.CILER: Chungnam Institute of Livestock Experiment Research.GLRI: Gyeongbuk Livestock Research Institute.SNU: Seoul National University.