Table 2. Effects of dietary brown rice on the growth performance and spleen weight of broiler chickens either subjected or not to heat stress.

	TN		HS		TN	HS	Corn	Rice	Pooled SEM	Significance
	Corn	Rice	Corn	Rice						T	D	T×D
Body weight gain (g)	1,069b	1,349a	894c	1,064b	1,209	979	981	1,206	41.0	<0.01	<0.01	0.19
Feed intake (g)	1,650ab	1,843a	1,390c	1,492bc	1,746	1,441	1,520	1,668	54.6	<0.01	0.07	0.41
Feed efficiency (g:g)	0.65b	0.73a	0.64b	0.72a	0.69	0.68	0.64	0.72	0.01	0.55	<0.01	0.84
Spleen weight (g/ kgBW)	1.23	1.04	1.21	0.94	1.14	1.08	1.22	0.99	0.09	0.50	0.02	0.71

The values are means of 10 birds per treatment and their pooled SEM.

^{a, b, c}p<0.05 for each treatment; values with different superscript letters are significantly different.

Abbreviations: BW, body weight; TN, thermo-neutral; HS, heat stress; T, temperature; D, diet.