Table 6. Comparison of the expression level of HSP-90α gene of hatched chickens in summer and winter

Hatched	10 wks		20 wks		40 wks
	ΔCt	2-ΔΔCt	ΔCt	2-ΔΔCt	ΔCt	2-ΔΔCt
Summer	18.08±3.02**	1	19.74±4.18**	1	22.33±3.67**	1
Winter	16.95±3.48	2.19	18.24±3.15	2.82	20.41±3.09	3.87

Values are means±standard deviation.
ΔCt value which is equal to the difference in threshold cycles for target and internal control gene.
The values are 2^−ΔΔct which indicates the fold change in gene expression relative to the control.
Values in the same column are significantly different (^** P<0.01).