Table 2. Allele frequency of six SNPs in the promoter region of the chicken MMP13 gene.

Locus or Haplotype	Allele	White Recessive Rock (n = 510)	Hy-Line Brown (n = 45)	Wenchang (n = 53)	Jining Bairi (n = 37)	Wenshang Barred (n = 46)
g.–1719T > C	T	0.917	1.000	0.774	0.838	0.935
g.–1661C > A	C	0.917	1.000	0.774	0.838	0.772
g.–1356G > A	G	0.819	0.600	0.953	0.622	0.989
g.–1128A > G	A	0.819	0.600	0.679	0.595	0.804
g.–1094C > G	C	0.825	0.600	0.755	0.676	0.989
g.–1079T > C	T	0.825	0.600	0.755	0.676	0.837