Table 3.

Effect of experimental diets on productive performance and eggshell quality of laying hens during the late laying period (52- to 60-week-old).

Items	Treatments1			SEM	P-value
	CON	ITM	TRT
Egg production (%)2	78.91a	76.08b	78.68a	0.01	<0.05
Egg loss (%)2	2.07b	2.51a	1.91c	0.01	<0.05
Shell strength (N)3	35.89a	24.87b	35.34a	1.50	<0.05
Eggshell thickness (mm)3	0.35	0.34	0.35	0.01	0.532

^a,bValues with different superscripts in the same row are different (P < 0.05).

¹CON (control), basal diet + inorganic trace minerals at commercial level; ITM, basal diet + inorganic trace minerals at 1/3 commercial level; TRT, basal diet + proteinated trace minerals at 1/3 commercial level.

²Results are the mean and SEM of 9 replications per treatment.

³Results are the mean and SEM of 18 eggs per treatment.