The study aimed to evaluate the response of the Alexandria strain as a local chickens during summer months to the different levels of Cystinol (Goldenrod extract product contain flavonoids). The treatments were as follows: control - zero level of Cystinol (T1), 25 mg. Cystinol / kg feed (T2), 50 mg. Cystinol / kg feed (T3) and 75 mg. Cystinol / kg feed (T4).The evaluated characters were some semen characteristics, cocks semen plasma traits, and cocks blood constituents.