Table 6.

Effects of dietary supplementation with essential oil on digestive enzyme activity (U/g) of ileal digesta¹

Items	Treatments2				SEM3	P-value
	Control	EO100	EO200	EO400		ANOVA	Linear	Quadratic
Chymotrypsin	495.68c	556.43b	617.16a	531.75bc	10.60	< 0.001	0.300	< 0.001
α-amylase	561.93	573.45	533.00	578.53	10.58	0.444	0.737	0.574
Lipase	2.97	3.25	4.21	4.10	0.20	0.059	0.023	0.040

¹ n = 8 replicates per treatment at the end of week 12

² Control, hens received a basal diet; EO100, EO200 and EO400, hens received a basal diet supplemented with 100, 200 or 400 mg/kg oregano essential oil, respectively

³ SEM, standard error of the mean

^a-b Values within a row with no common superscripts differ significantly (P < 0.05)