ERWIN A. MARTIN, LOUIE C. MARTIN, NEIL ANDRO D. PEREZ. July 2022. "EFFECTS OF LIQUID AND POWDER PROBIOTICS IN THE GROWTH PERFORMANCE OF BROILER CHIKEN", Bachelor of Science in Agriculture major in Animal Science. Pampanga State Agricultural University, PAC, Magalang, Pampanga. Adviser: RICARDO D. HERNANDEZ JR, M.S.A. This study was conducted to determine the effects of liquid and powder probiotics in the growth performance of broiler chicken. One hundred eighty (180) broilers were subjected to a two factorial experiment and were distributed into six (6) treatments (A1B1 - control, 100% fresh water; A1B2 - 2ml liquid probiotics and lliter fresh water; A2B3 - 3mil liquid probiotics and lliter fresh water; A2B1 - control, 100% fresh water; A2B2 - 2grams powder probiotics and lliter fresh water; and A2B3 - 3grams powder probiotics and lliter fresh water) following a complete randomized design (CRD). Each treatment was replicated thrice with 10 broilers per replication. The study's findings showed the broiler's growth performance was significantly impacted by the addition of liquid probiotics (A1) and three 3 ml (B3) to their water supply in terms of final weight, weight gain, average daily gain, and feed conversion ratio. However, the type of probiotics had significant difference on the growth performance of the birds. All the treatments given to the birds are outperformed by liquid probiotics supplemented in 3ml. Due to their positive impact on intestinal metabolism, which enables the broilers to gain desirable weight over a period of time.