One hundred and twenty one-day-old małe broiler chickens were allocated into four groups, 5 replicates of 6 birds in each. Chickens were fed either a control diet or the same diet with the addition of 5, 10 or 15 g per kg of dried skullcap (Scutellaria baicalensis Georgi -SCR) root. The addition of 5 and 10 g SCR per kg diet had little effect on performance and blood parameters. In the group fed the diet with 15 g SCR, body weight gain, red blood celi count and haemoglobin level was higher (PO.05), while the HDL, LDL, and total cholesterol levels in blood serum (PO.05) were lower than in the control group. The glucose level in blood serum was variable, aspartate aminotransferase and alkaline phosphatase activities were similar, while alaninę aminotransferase activity, higher (PO.05) in all groups fed diets with SCR than in the control group.