Abstrak. Tujuan penelitian ini adalah untuk mengetahui efek penggunaan campuran tepung kulit pisang fermentasi, bungkil kelapa, minyak sawit, dan feed supplement sebagai substitusi sebagian ransum komersil terhadap bobot dan persentase organ pencernaan dan sirkulasi itik peking. Penelitian ini dilakukan di Laboratorium Lapangan Peternakan (LLP), Univeritas Syiah Kuala, tanggal 22 Februari‒19 April 2017. Penelitian ini menggunakan 96 ekor anak itik peking (Day Old Duck). Rancangan yang digunakan adalah Rancangan Acak Kelompok dengan Subsampel (Randomized Block Design with Subsampling) terdiri dari 4 perlakuan, 4 kelompok, dan 2 subsampling. Tiap kelompok merupakan unit percobaan, masing-masing terdiri dari enam ekor itik. Perlakuan yang dicobakan adalah pemberian tepung kulit pisang fermentasi + bungkil kelapa + minyak sawit + feed supplement sebanyak masing-masing 0% (P1), 4+2,5+0,5+1% (P2), 8+5+1+1% (P3), dan 12+7,5+1,5+1% (P4). Parameter yang diamati meliputi berat dan persentase organ pencernaan (crop, gizzard, usus, hati, pancreas) dan organ sirkulasi (jantung, limpa, dan darah). Hasil penelitian memperlihatkan campuran tepung kulit pisang fermentasi sebanyak 12% ditambah bungkil kelapa 7,5%, minyak kelapa 1,5%, dan feed supplement 1% dapat digunakan untuk mensubstitusi ransum komersil itik peking sampai 22% selama periode pemeliharaan 3‒8 minggu tanpa berpengaruh nyata (P0,05) terhadap bobot dan persentase organ pencernaan dan sirkulasi itik peking. (Effect of Inclusion of Fermented Banana Peel Meal to the Weights and Percentages of Digestion and Circulatory Organs of Peking Ducks) Abstract. The aim of present study was to determine effect of inclusion of fermented banana peel meal + coconut meal + coconut oil + feed supplement as partial substitution of duck commercial diet to the weights and percentages of digestion and circulatory organs of peking ducks. The study was conducted in Field Laboratory of Animal Husbandry, Livestock Department, Faculty of Agriculture, Syiah Kuala University, February 22 until April 19, 2017. As many as 96 peking DOD were used in this study. The study was performed into randomized block design with subsamples (RBD with subsamples), consisted of 4 treatments, 4 blocks, and 2 subsamples. Each group was an experimental unit, each consisting of six ducks. The treatment was the inclusion of fermented banana peel meal + coconut meal + coconut oil + feed supplement with the level of 0% (P1), 4+2,5+0,5+1% (P2), 8+5+1+1% (P3), and 12+7,5+1,5+1% (P4), respectively. The parameters observed were the weights and percentages of digestion organs (crop, gizzard, intestine, liver, pancreas,) and circulatory organs of peking ducks. The results of study showed that inclusion of up to 12% fermented banana peel + 7,5% coconut meal + 1% coconut oil + 1% feed supplement as partial substitution of commercial diet did not significantly (P0.05) affect on the weights and percentages of digestion and circulatory organs of peking ducks.