Abstract: To study the effects of extractive from Penthorum chinense pursh on the growth performance and serum biochemical parameters in broilers, we adopted 300 broilers at one day of age and assigned them into 5 groups randomly with 20 broilers in each of 3 repeats. We fed the basal diet to the first group, and added 0.1% thymol, 0.1% ,0.2%, and 0.4% extractive of Penthorum chinense pursh based on the basal diet to groups Ⅱ, Ⅲ, Ⅳand Ⅴ, respectively. Body weights and serum biochemical parameters were evaluated at 21 and 35 day of age. The results showed that extractive of Penthorum chinense pursh increased daily weight gain, which was better than thymol (P<0.01).Compared with group Ⅰ,4% Penthorum chinense pursh increased the content of serum globulins, reduced the content of glutamic-pyruvic transaminase, glutamic-oxalacetic transaminease, and total cholesterol content at 21 d of age (P<0.05). In Penthorum chinense pursh treated groups of Ⅳand Ⅴ total protein, albumin, and uric acid content in serum significantly increased (P<0.05), globulin and high-density lipoprotein cholesterol content great significantly increased (P<0.01), and total cholesterol, triglycerides,and low density lipoprotein significantly reduced compared with group Ⅰ; the activities of cereal third transaminase and aspertate aminotransferase were great significantly different (P<0.01).

Key words: extractive of Penthorum chinense pursh; growth performance; serum biochemical parameters; broiler