Table 8. Effect of different levels of dietary Na with or without microbial phytase on total protein (mg/g) content, alkaline phosphatase (AP;μM/mg protein/mn) Ca-, Mg-, Ca-Mg-ATPase, and Na-K-ATPase (nmol/mg protein/ min) activityof jejunum mucosa

Na level¹⁾	Phytase²⁾	Protein	AP	Ca-Mg ATPase	Ca-ATPase	Mg-ATPase	Na-K-ATPase
Low	None	53.53^bc	3.60^a	168.06	164.21^b	145.18^c	49.92
	Plus	53.13^bc	2.60^c	177.21	160.69^b	158.67^b	86.38
Mid	None	55.20^ab	2.48^c	153.39	159.42^b	190.20^a	73.58
	Plus	57.82^a	3.01^b	162.85	170.77^b	166.59^b	98.17
High	None	57.23^a	3.19^b	165.48	165.84^b	154.81^bc	65.13
	Plus	50.85^c	3.78^a	187.01	210.72^a	180.53^a	85.39
SEM		0.17	0.03	1.49	1.65	0.88	1.09
Main effects
Na level
Low		53.33^b	3.10^b	172.64^ab	162.45^b	151.92^c	68.15^b
Mid		56.51^a	2.75^c	158.12^b	165.10^b	178.40^a	85.88^a
High		54.04^b	3.48^a	176.25^a	188.28^a	167.67^b	75.26^ab
	Phytase
	None	55.32^a	3.09	162.31^b	163.16^b	163.40^a	62.88^b
	Plus	53.93^b	3.13	175.69^a	180.73^a	168.60^a	89.98^a
Source of variation
Na		***	***	*	***	***	**
Phytase		*	n.s.	*	**	n.s.	***
Na × Phytase		***	***	ns	***	***	n.s.

Means were obtained from 6 replicates (2 birds per cage).
Means within a column without common superscript are statistically different (p < 0.05).
Low, 1.5 g Na/kg; Mid, 2.5 Na/kg; High, 3.5 g Na/kg.
None, without phytase; plus, with (500 U/kg) phytase.
p > 0.05; ^*p < 0.05; ^** p < 0.01; ^*** p < 0.001.