The study was conducted at Barangay Sta Maria Magalang, Pampanga, from May 7 2022 to June 4, 2022, to find out the effect of spirulina on the growth performance of cobb fed with different brands of commercial feeds. One hundred - eighty 10 - day old chicks of cobb 500 were randomly distributed in six treatments and replicated 3 times. Each treatment was composed of 10 chicken. The treatments were: treatment A1B1 served as the control were fed with pure sarmmanok feeds, A1B2 served as the control were fed with pure b - meg integra feeds, A2B] supplemented with 7 grams of spirulina mix in 93 percent of sarimanok feeds, A2B2 supplemented with 7 grams of spirulina mix in 93 percent of b - meg integra feeds, while A3B1 supplemented wrth 10 grams of spirulina mix in sarimanok feeds and A3B2 supplemented with 10 grams of spiruhna aux m b - Meg integra feeds. Result of the study revealed that there were no significance observed in wnitial weight, ed consumpuon and feed conversion ratio, while in the final weight, gain weight and everage daly gain has 8 significantly difference.