Table 3. Effects of supplemental different minerals on nutrient digestibility in broiler chickens under cyclic heat stress

Items (%)	NC	PC	ILT	ZLT	OC	SE	p-value
ATTD
GE	78.78^ab	77.98^b	79.60^a	79.96^a	79.67^a	0.48	0.044
DM	79.03	77.78	78.86	78.71	78.38	0.34	0.105
CP	74.66	73.85	74.31	73.84	73.75	0.36	0.367
AID
GE	78.08^a	75.94^b	77.32^ab	77.59^ab	77.03^ab	0.46	0.034
DM	76.46^a	74.33^b	75.56^ab	75.85^ab	75.30^ab	0.45	0.038
CP	74.37	73.39	74.42	75.42	74.25	0.58	0.227

Means within column with different superscripts differ significantly (p < 0.05).
NC, basal diet; PC, NC and start of heat stress at the 2nd week; ILT, PC + 1% of illite; ZLT, PC + 1% of zeolite; OC, PC + 400 ppb of organic chromium.
SE, standard error; ATTD, apparent total tract digestibility; GE, gross energy; DM, dry matter; CP, crude protein; AID, apparent ileal digestibility.