Table 4 External egg quality (shell strength and shell thickness) under dry condition (25°C, 35±2% RH) during storage

Factor	Treatment	Storage duration (d)
		0	7	14	21
Eggshell strength (kg/cm2)	Control	3.40 ±0.26	2.89 ±0.20	3.18 ±0.17	3.50 ±0.15
	UV+washing	3.63 ±0.18	3.03 ±0.35	3.28 ±0.33	3.08 ±0.17
	ClO2(g) 40 ppm	3.09 ±0.30	3.44 ±0.23	3.20 ±0.22	3.17 ±0.23
Eggshell thickness (mm × 100)	Control	0.39 ±0.01	0.40 ±0.01	0.39 ±0.01	0.40 ±0.01
	UV+washing	0.38 ±0.01	0.39 ±0.02	0.40 ±0.01	0.40 ±0.01
	ClO2(g) 40 ppm	0.38 ±0.01	0.41 ±0.01	0.39 ±0.01	0.39 ±0.01

All data expressed as mean±SEM.