Identification of candidate genomic regions for chicken egg number traits based on genome-wide association study

BMC Genomics

Table 3 Summary of phenotypic data

Group	Breeds	Abbreviation	Sample size	Average annual egg numberⁿ	Total^b
High productivity	White Leghorn^a	WL	100	315	220
	Dwarf^c	DW	60	280
	Rhode Island Red^d	RIR	60	310
low productivity	Beijing You^e	BY	42	110	222
	Henan Game^f	HN	13	100
	Xishuangbanna Game^g	XS	10	110
	Turpan^h	TU	11	70
	Zhangzhou Gameⁱ	ZZ	10	80
	Luxi Game^j	LX	10	40–60
	Tibetan^k	TB	42	40–80
	Hongshan^l	HS	42	116
	Taihe Silkies^m	SK	42	110
Total	–	–	–	–	442

^aWhite Leghorn came from two different groups. Among them, 40 samples obtained from the Experimental Chicken Farm at the China Agricultural University, 60 samples obtained from Beijing Yanqing Commercial Layer Breeding Company. Their abbreviations are WL_CAU and WL_YQ, respectively
^bRegarding the sample size, we tried to make the ratio between case and control was 1:1 to avoid the large number difference between the two groups interfering the results
^cDwarf chickens obtained from Beijing Yanqing Commercial Layer Breeding Company
^dRhode Island Red obtained from Beijing
^eBeijing You chickens obtained from Beijing
^fHenan Game obtained from Henan province
^gXishuangbanna Game obtained from Xishuangbanna, Yunnan province
^hTurpan obtained from Turpan, Xinjiang
ⁱZhangzhou Game obtained from Fujiang province
^jLuxi Game obtained from Shandong province
^kTibetan obtained from four different places, including the Experimental Chicken Farm at the China Agricultural University, Nimu, Tibet, Naidong, Tibet and Lingzhi, Tibet
^lHongshan chickens obtained from Hubei province
^mTaihe Silkies chickens obtained from the Experimental Chicken Farm at the China Agricultural University
ⁿRefer to the poultry genetic resources in China

ISSN: 1471-2164