Table 1.

Experimental grouping and oral medication of 100 chickens.

Group	Antigen	Oral administration
Control	None	Normal saline
ND	Inactivated NDV antigen	Normal saline
GPS-L	Inactivated NDV antigen	GPS-L (300 mg/kg)
GPS-M	Inactivated NDV antigen	GPS-M (450 mg/kg)
GPS-H	Inactivated NDV antigen	GPS-H (600 mg/kg)