Table 7. Comparison of the expression level of HSP-90β 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	7.89±3.31**	1	11.06±4.40**	1	11.71±1.56**	1
Winter	5.92±2.30	3.92	8.66±2.84	5.30	9.21±2.98	2.82

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).