Table 4.

Mean and standard deviation for eggshell quality

Trait	Controls	Experiments
Laying rate, %	82.44 ± 4.45	82.19 ± 4.12
Egg weight, g	41.79 ± 3.47	42.54 ± 3.69
Egg thickness, mm	0.314 ± 0.024	0.308 ± 0.023
Eggshell strength, kg/cm2	3.325 ± 0.570	3.174 ± 0.561
Eggshell weight, g	4.76 ± 0.37	4.72 ± 0.45
Eggshell ratio, %	11.53 ± 0.84a	11.15 ± 0.67b

^a,b Means in same row with lacking a common superscript differ significantly (P < 0.05).