SUBSTITUSI MENIR DAN BUNGKIL KELAPA DALAM RANSUM KOMERSIL TERHADAP BERAT AKHIR DAN PERSENTASE KARKAS AYAM BROILER Syahrial NIM 1105104010011 ABSTRAK Tujuan penelitian ini adalah untuk mengetahui pengaruh pemberian menir dan bungkil kelapa sebagai substitusi sebagian ransum komersil serta penambahan suplemen probiotik marolis di dalam air minum terhadap berat badan akhir dan persentase karkas ayam broiler. Penelitian ini dilakukan di Field Lab, Jurusan Peternakan, Fakultas Pertanian, Univeritas Syiah Kuala, tanggal 13 Februari-20 Maret 2015. Penelitian ini menggunakan 100 ekor DOC ayam broiler, strain CP 707, produksi PT. Charoen Pokphand Jaya Farm, Medan. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) terdiri dari 5 perlakuan dan 4 ulangan. Setiap ulangan merupakan unit percobaan masing-masing terdiri dari 5 ekor ayam. Perlakuan yang dicobakan selama periode starter ransum komersil 511Novo dengan kombinasi menir+bungkil kelapa sebanyak 0% (R1), 1.5+1% (R2), 3+2% (R3), 4,5+3% (R4), dan 6+4% (R5). Periode grower/finisher, ransum komersil 512Novo dengan kombinasi menir+bungkil kelapa sebanyak 0% (R1), 3+2% (R2), 6+4% (R3), 9+6% (R4), dan 12+8% (R5). Masing-masing perlakuan R2-R4 ditambah probiotik marolis sebanyak 0.5-1 ml/l air. Data dianalisis dengan Analysis of Variance (ANOVA). Parameter yang diukur adalah berat badan akhir, berat karkas, persentase karkas, berat potongan karkas, persentase potongan karkas, berat lemak abdomen dan persentase lemak abdomen. Hasil penelitian memperlihatkan bahwa substitusi sebagian ransum komersil dengan menir+bungkil kelapa sampai 20% ditambah probiotik marolis dalam air minum tidak berpengaruh nyata terhadap berat akhir ayam, berat karkas, berat potongan karkas, persentase potongan karkas, berat lemak abdomen, persentase lemak abdomen, namun berpengaruh nyata (P˂0.05) terhadap persentase karkas ayam broiler umur 35 hari. Kesimpulan yang diperoleh adalah penggunaan menir (6-12%) dan bungkil kelapa (4-8%) serta probiotik marolis (1%) di dalam air minum dapat digunakan sebagai substitusi sebagian ransum komersil tanpa berpengaruh nyata terhadap berat badan akhir dan mampu memberikan bobot karkas yang sama dengan pemberian ransum kontrol (ransum komersil 100%). Kata Kunci: Menir, Bungkil Kelapa, Probiotik Marolis, Broiler, Berat Akhir, Karkas   BROKEN RICE SUBSTITUTION AND COCONUT MEAL IN COMMERCIAL FEED TO FINAL BODY WEIGHT AND PERCENTAGE OF CARCASS BROILER CHICKENS Syahrial NIM 1105104010022 ABSTRACT The purpose of this research was to determine the effect of broken rice and coconut meal as partial substitution of commercial feed and adding probiotic supplements marolis in drinking water to final body weight and the percentage of broiler chicken carcasses. This research was conducted at the Field Lab, Department of Animal Husbandry, Faculty of Agriculture, Syiah Kuala University, from 13 February to March 20, 2015. The study used 100 broiler DOC, strain CP 707, produced by PT. Charoen Pokphand Jaya Farm, Medan. The study was designed into Completely Randomized Design (CRD) consisting of 5 treatments and 4 replications. Each repetition was an experimental units, each consisting of 5 chickens. The treatment was tested over a period of 511Novo commercial starter ration combination with broken rice+coconut meal as much as 0% (R1), 1.5+1% (R2), 3+2% (R3), 4+3% (R4), and 6+4% (R5). During the period of grower/finisher, 512 Novo commercial ration combination with broken rice+coconut meal as much as 0% (R1), 3+2% (R2), 6+4% (R3), 9+6% (R4), and 12+8 % (R5). Each treatment R2-R4 plus probiotic marolis as much as 0.5-1 ml/l of water. Data were analyzed by Analysis of Variance (ANOVA). Parameters measured were the final body weight, carcass weight, carcass percentage, pieces of carcass weight, carcass percentage cuts, abdominal fat weight and abdominal fat percentage. The results showed that the substitution of commercial feed with coconut meal broken rice+up to 20% plus probiotics marolis in drinking water was not significant to the final weight of the chicken, carcass weight, carcass weight pieces, pieces of carcass percentage, abdominal fat weight, percentage abdominal fat, but significant (P˂0.05) against the percentage of broiler chicken carcasses age of 35 days. The conclusion is the use of broken rice (6-12%) and coconut meal (4-8%) and probiotics marolis (1%) in drinking water can be used as a partial substitution of commercial feed without any significant effect to final body weight and is able to provide carcass weight the same with the provision of control diet (commercial feed 100%). Key Words: Broken Rice, Coconut Meal, Probiotic, Broiler, Final Body Weight, Carcass