Table 6.

Effects of individual or combination of organic acids and essential oils on the activities of L-alanine aminopeptidase (nmol p-nitroaniline liberated/mg protein∙min), sucrase (nmol glucose released/mg protein∙min), and maltase (nmol glucose released/mg protein∙min) in the jejunum of broiler chickens on D 35.

Item	NC 1	PC	OA	EO	OA + EO	SEM	p Value
L-alanine aminopeptidase	10.17	11.11	7.81	11.38	10.91	5.6	0.942
Sucrase	1.72	1.51	1.45	1.33	1.62	0.46	0.624
Maltase	17.16	15.41	15.09	13.52	16.96	3.6	0.419

¹ NC, negative control; PC, positive control (NC + 50 mg/kg bacitracin methylene disalicylate (BMD-50; Zoetis Products, Chicago Heights, IL, USA)); OA, organic acids (NC + 2000 mg/kg OA (Nutribins LLC, Walnut, CA, USA)); EO, essential oils (NC + 300 mg/kg EO (Nutribins LLC, Walnut, CA, USA)), and OA + EO (NC + 2000 mg/kg OA + 300 mg/kg EO).