Abstract: The effects of diet containing 10% of Peganum harmala L. or 10% of Ballota undulata leaves or their 1:1 mixture (5 + 5%) on Chicks treated for 2 weeks were investigated. A depression in growth and hepatotoxicity characterized treatment with P. harmala and B. undulata given alone. Hepatotoxicity, widespread congestion and hemorrhage in Chicks fed Peganum harmala L. leaves alone were marked and accompanied by anemia and alterations in serum concentrations of total protein, albumin, globulin, cholesterol and other serum constituents. Feeding the mixture of the two plants caused more marked depression in growth but no death among the Chicks occurred.