The quality of broiler chicken carcasses is greatly influenced by feed management and the number of nutrients digested in the digestive tract that will be utilized for optimal meat production. The study aimed to determine the effect of feeding fermented feed at different times on the production performance and quality of broiler chicken carcasses. The number of day-old chicks used in this study was 180 broiler chickens strain Cobb. This study was carried out experimentally using a complete randomized design consisting of four treatments and five replications. Each treatment carried out in this experiment consisted of a different length of time, namely feeding for 2, 3, 4, and 5 weeks. Experimental parameters included feed consumption, weight gain, and ration conversion. In addition, the carcass quality was investigated as live weight, carcass percentage, and percentage of broiler chicken abdominal fat. The results showed that the longer the time of fermentation feed significantly increased feed consumption by 40.07% and increased 13.77% weight gain, as well as decreased ration conversion by 25.33%. Furthermore, the same results were also obtained regarding live weight by 17.80% and increased percentage of the carcass by 8.84%, while the percentage of abdominal fat decreased by 12.90%. It can be concluded that the provision of fermented feed for 5 weeks can improve the production performance and carcass quality of broiler chickens. Keywords: Broiler chicken, Carcass quality, Fermented feed, Performance The quality of broiler chicken carcasses is greatly influenced by feed management and the number of nutrients digested in the digestive tract that will be utilized for optimal meat production. The study aimed to determine the effect of feeding fermented feed at different times on the production performance and quality of broiler chicken carcasses. The number of day-old chicks used in this study was 180 broiler chickens strain Cobb. This study was carried out experimentally using a complete randomized design consisting of four treatments and five replications. Each treatment carried out in this experiment consisted of a different length of time, namely feeding for 2, 3, 4, and 5 weeks. Experimental parameters included feed consumption, weight gain, and ration conversion. In addition, the carcass quality was investigated as live weight, carcass percentage, and percentage of broiler chicken abdominal fat. The results showed that the longer the time of fermentation feed significantly increased feed consumption by 40.07% and increased 13.77% weight gain, as well as decreased ration conversion by 25.33%. Furthermore, the same results were also obtained regarding live weight by 17.80% and increased percentage of the carcass by 8.84%, while the percentage of abdominal fat decreased by 12.90%. It can be concluded that the provision of fermented feed for 5 weeks can improve the production performance and carcass quality of broiler chickens. Keywords: Broiler chicken, Carcass quality, Fermented feed, Performance