Table 2.

Effect of the dietary synbiotic inclusion on body and organ weights of 28-day-old and 42-day-old broilers under thermoneutral and heat stress conditions.

	Absolute liver weight (g)	Relative liver1	Absolute spleen weight (g)	Relative spleen1	BW (kg)
28-d
TN-CON	28.83	1.99Y	1.19	0.83	1.44
TN-BMD	32.20	2.30X	1.44	1.04	1.39
TN-SYN	29.76	2.08X	1.26	0.89	1.42
HS-CON	28.91	2.12	1.14	0.84Y	1.36
HS-BMD	27.58	2.11	1.29	0.99XY	1.32
HS-SYN	25.46	2.08	1.34	1.09X	1.22
Feed additives
CON	28.87	2.06B	1.16	0.84B	1.40
BMD	29.89	2.21A	1.37	1.02A	1.35
SYN	27.61	2.08B	1.30	0.99AB	1.32
Temperature
TN	30.26a	2.13	1.30	0.92	1.42a
HS	27.32b	2.10	1.26	0.98	1.30b
SEM	0.99	0.05	0.06	0.06	0.03
P-value
Diet	0.41	0.08	0.18	0.10	0.50
Temperature	0.05	0.74	0.58	0.33	0.01
Diet × temperature	0.34	0.17	0.47	0.14	0.36
42-d
TN-CON	41.58Y	1.54	2.24XY	0.84y	2.70y
TN-BMD	54.26X	1.90	2.11Y	0.74y	2.86x
TN-SYN	53.74X	1.78	2.81X	0.93x	3.00x
HS-CON	43.87	1.69	1.98	0.76	2.59y
HS-BMD	43.73	1.76	2.23	0.90	2.49xy
HS-SYN	46.85	1.70	2.19	0.79	2.75x
Feed additives
CON	42.72B	1.61	2.11	0.80	2.65a
BMD	49.00A	1.83	2.17	0.82	2.67a
SYN	50.30A	1.74	2.50	0.86	2.67a
Temperature
TN	49.86a	1.74	2.39A	0.84	2.85a
HS	44.82B	1.72	2.13B	0.82	2.61b
SEM	2.56	0.11	0.19	0.06	0.08
P-value
Diet	0.10	0.17	0.17	0.70	0.04
Temperature	0.08	0.83	0.08	0.68	0.0003
Diet × temperature	0.17	0.37	0.10	0.02	0.20

^a,bLeast squares means within a column for the 3 dietary treatments under 2 temperature conditions lacking a common superscript differ (P ≤ 0.05. n = 8 per treatment) and ^ABleast square means represents a trend difference (0.05 < P ≤ 0.1).

^x,yLeast squares means within a column for the 3 dietary treatments under 1 temperature condition (HS or TN) (P ≤ 0.05) and ^XYleast square means represents a trend different (0.05 < P ≤ 0.1).

¹Relative liver was calculated as absolute liver weight (g)/BW(kg) × 100; relative spleen weight was calculated as absolute spleen weight (g)/BW(kg) × 100.