This study was carried out to investigate the effects of dietary supplementation of hydroalcoholic extract of Heracleum Persicum (HPE) fruit on performance, immune responses, small intestine morphology, haematological parameters and carcass characteristics of broiler chickens. A total of 300-day-old Ross 308 broiler chicks were used in a completely randomized design with five treatments and five replicates of 12 chicks each. The treatments consisted of five dietary levels of HPE at 0 (control), 100, 200, 300 and 400 mg/kg of diet. The diets were fed ad libitum from one to 42 days of age. A significant increase in average daily feed intake was observed by 100 mg/kg of HPE supplementation compared to control group during 1-42 days of age (P < 0.05). Experimental treatments significantly decreased the level of cholesterol and LDL in blood serum compared to control group (P < 0.05). The ratio of villus height to crypt depth (VH/CD) was increased by 400 mg/kg of HPE than control group at 42 days of age (P < 0.05). The results of this study showed that Heracleum Persicum fruit extract improves small intestine morphometrical and haematological parameters and performance of broiler chickens.

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