Table 2
The frequencies of allele and genotype of the c.72G>A loci

Breeds (n)	Genotype frequency (n)			Allele frequency		Genetic characteristic			x2	P-value
	AA	AG	GG	A	G	He	PIC	Ne
Ira (94)	0.36 (34)	0.51 (48)	0.13 (12)	0.62	0.38	0.47	0.36	1.90	0.61	>0.05
Champagne (83)	0.27 (22)	0.60 (50)	0.13 (11)	0.57	0.43	0.49	0.37	1.97	4.25	<0.05
Tianfu (71)	0.17 (12)	0.63 (45)	0.20 (14)	0.49	0.51	0.50	0.37	1.99	5.12	<0.05
Total (248)	0.27 (68)	0.58 (143)	0.15 (37)	0.56	0.44	0.49	0.37	1.99	7.30	<0.01