An experiment was carried out to determine the effect of catfish by-product protein hydrolysate (CB), organic acids (OA) and a source of probiotics (PRO) in diets on performance and meat quality of local chickens in a semi-scavenging system. A total of 300 Noi chickens (male) at 4 weeks of age were allocated at random to 4 treatments, with 3 householders as replicates in a randomized block design. Each replicate consisted of 4 pens with 25 birds in each pen. Treatments were FM: Basal diet + marine fish meal (control); CB: basal diet with CB; CBOA: basal diet with CB + OA; CB-PRO: basal feed with CB + PRO; The experiment was over 12 weeks (4-16 weeks of age). The chickens tended (p=0.09) to have slightly better (4.5%) growth rate when their supplementary feed contained low levels (0.2%) of organic acids or a probiotic (culture of Lactobacilli and Saccharomyces cerevisiae).