Table 4. Correlation coefficients among nutrient concentrations, in vitro nutrient disappearance, standardized ileal digestibility (SID) of crude protein (CP), and apparent total tract digestibility (ATTD) of gross energy (GE) in feed ingredients fed to pigs (n = 10)

Item	CP	EE	Ash	aNDF	ADF	IVID of CP	IVTTD of DM	SID of CP	ATTD of GE
GE	0.24	0.97***	−0.01	−0.13	−0.10	0.42	0.18	0.13	0.14
CP		0.04	0.75*	−0.12	−0.09	0.52	0.27	0.14	−0.01
EE			−0.21	−0.17	−0.15	0.34	0.21	0.15	0.22
Ash				0.44	0.42	0.08	−0.24	−0.40	−0.59
aNDF					0.98***	−0.65*	−0.93***	−0.81**	−0.92***
ADF						−0.61	−0.91***	−0.75*	−0.87**
IVID of CP							0.78**	0.82**	0.66*
IVTTD of DM								0.83**	0.89***
SID of CP									0.92***

p < 0.05
p < 0.01
p < 0.001.
EE, ether extract; aNDF, amylase-treated neutral detergent fiber; ADF, acid detergent fiber; DM, dry matter; IVID, in vitro ileal disappearance; IVTTD, in vitro total tract disappearance.