Table 4.

The effects of probiotic on serum parameters of 43-day-old broilers subjected to daily cycling heating episodes.

Item	Control	Probiotic	SEM	P value
Calcium (mg/dL)	11.86	11.34	0.13	0.32
Phosphate (mg/dL)	2.06	2.19	0.02	0.14
5-Hydroxytryptamine (ng/mL)	35.81	31.33	11.44	0.50
Tryptophan (umol/L)	68.77	68.37	24.97	0.93
Corticosterone (ng/mL)	2.99	2.19	0.80	0.42

Least square means were presented (n = 12).