Table 2.

Growth performances of thermoneutral and heat-stressed broiler chickens fed different levels of SBPM.

Age (Period)	Thermoneutral, SBPM (ppm)				Heat-Stressed, SBPM (ppm)				SEM	ANOVA
	0	75	150	300	0	75	150	300		Temp.	Diet	Temp. × Diet
Body weight, g
10 d	336	336	328	337	-	-	-	-	4	-	0.107	-
25 d	1415 a	1425 a	1424 a	1409 a	1179 c	1157 c	1224 b	1383 a	24	p < 0.001	p < 0.001	p < 0.001
35 d	2313 b	2437 a	2475 a	2409 ab	1998 d	1988 d	2110 c	2294 b	37	p < 0.001	p < 0.001	p < 0.001
42 d	3168 a	3255 a	3300 a	3233 a	2686 d	2710 cd	2849 c	3016 b	54	p < 0.001	p < 0.001	p < 0.001
Body weight gain, g
0–10 d	292	293	285	294	-	-	-	-	4	-	0.103	-
11–25 d	1080 a	1085 a	1097 a	1076 a	843 c	825 c	894 b	1043 a	25	p < 0.001	p < 0.001	p < 0.001
26–35 d	898	1011	1051	1000	819	832	886	911	45	p < 0.001	p < 0.001	0.283
36–42 d	855	818	825	824	688	722	739	722	61	p < 0.001	0.993	0.7792
0–42 d	3125 a	3212 a	3257 a	3190 a	2643 d	2667 c	2806 c	2973 b	54	p < 0.001	p < 0.001	p < 0.001
Feed intake, g
0–10 d	297	297	293	301	-	-	-	-	7	-	0.620	-
11–25 d	1402 a	1394 a	1380 a	1384 a	1222 b	1219 b	1235 b	1372 a	40	p < 0.001	0.038	0.015
26–35 d	1461 b	1535 a	1534 a	1531 a	1384 c	1336 bc	1411 b	1439 b	33	p < 0.001	0.032	0.048
36–42 d	1539	1445	1460	1500	1366	1322	1325	1311	42	p < 0.001	0.096	0.647
0–42 d	4701	4674	4665	4717	4267	4170	4264	4422	65	p < 0.001	0.022	0.173
Feed conversion ratio
0–10 d	1.02	1.01	1.03	1.03	-	-	-	-	0.02	-	0.937	-
11–25 d	1.30	1.29	1.26	1.29	1.45	1.48	1.38	1.32	0.05	p < 0.001	0.067	0.126
26–35 d	1.63	1.52	1.47	1.54	1.71	1.61	1.60	1.58	0.06	0.012	0.022	0.797
36–42 d	1.86	1.81	1.78	1.83	2.02	1.85	1.83	1.83	0.16	0.463	0.659	0.918
0–42 d	1.51 b	1.46 bc	1.43 c	1.48 b	1.62 a	1.57 ab	1.52 b	1.49 b	0.03	p < 0.001	0.003	0.047

Data are means of six replicates (6 birds per replicate). Data were analyzed by one-way (stater) or two-way (grower, finisher-1/-2, total) ANOVA with Tukey’s multiple-comparison test. Different superscript letters indicate statistically significant differences (^abcd p < 0.05).