Table 4.

Effect of dietary β-carotene supplementation on egg quality.

Amount of β-carotene (mg/kg diet)	Albumen height (mm)	Haugh unit (HU)	Eggshell strength (kg)	Eggshell thickness (mm)
0 (basal diet)	6.74 ± 0.59	82.40 ± 3.48	4.18 ± 0.15	34.67 ± 0.60
15	6.75 ± 0.40	82.71 ± 2.01	4.23 ± 0.13	34.17 ± 0.31
30	6.83 ± 0.67	82.81 ± 2.62	4.21 ± 0.30	34.46 ± 0.57
60	6.81 ± 0.62	82.62 ± 2.74	4.25 ± 0.12	34.47 ± 0.21
120	6.80 ± 0.59	82.84 ± 2.93	4.31 ± 0.32	34.46 ± 0.34
P value	0.9885	0.9988	0.7765	0.2254