Table 2.

Effects of EO-PGS on performance and egg quality of laying hens.¹

	EO-PGS supplemental level/(g/kg)				SEM	P-value
Items	0	0.5	0.75	1.0
Performance
Egg production/%	87.40b	89.74ab	90.95a	91.37a	0.57	0.039
Average daily feed intake/g	113.69	111.43	111.57	112.61	0.59	0.519
Feed conversation ratio	2.03	1.98	1.95	1.95	0.02	0.381
Egg quality
D 28
Egg shape index	1.32	1.33	1.33	1.31	0.02	0.092
Shell strength, kgf	4.45	4.33	4.41	4.48	0.06	0.851
Egg weight, g	63.38	62.97	63.61	63.41	0.37	0.933
Yolk color	5.37	5.23	5.17	5.03	0.09	0.629
Haugh unit	76.13	73.32	71.61	71.49	0.89	0.297
Yolk index	0.39	0.38	0.38	0.38	<0.01	0.698
Shell thickness, mm	0.29	0.29	0.30	0.30	<0.01	0.141
D 56
Egg shape index	1.31	1.32	1.33	1.34	<0.01	0.301
Shell strength, kgf	4.11	4.02	4.08	4.35	0.08	0.525
Egg weight, g	64.23	63.90	65.14	65.19	0.37	0.521
Yolk color	5.77	6.43	6.20	6.13	0.14	0.384
Haugh unit	76.77	74.71	77.99	76.88	0.98	0.892
Yolk index	0.40b	0.44a	0.44a	0.44a	<0.01	0.002
Shell thickness, mm	0.33c	0.34bc	0.35b	0.38a	<0.01	<0.01

¹Means represent 6 replicates per treatment with 20 hens per replicate.