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The aim of this research was to evaluate the nutrient degradability, in vitro methane (CH 4) production of several agricultural and food industry by-products in relation to their chemical composition. Twenty-one samples of 7 feedstuffs from agricultural and food industry by-products consisted of corn straw, potato straw, rice straw, cocoa pod, sago waste, rice bran, soybean curd residue were evaluated by an in vitro gas production and nutrient degradability. The feedstuffs varied greatly in their crude protein (CP), neutral detergent fiber (NDF) and non-fiber carbohydrate (NFC) contents. Crude protein ranged from 1.5 to 21.8%, NDF from 31.6 to 71.1% and NFC from 1.5 to 50.8%. Among the seven feedstuffs, soybean curd residue had the highest CP content, on the other hand it had the lowest NDF content. Dry matter (DM) and organic matter (OM) degradability were highest (P<0.01) in soybean curd residue among the feedstuffs. The CH 4 production was significantly higher (P<0.01) in rice straw, cocoa pod and corn straw as compared to sago waste. There was a strong positive correlation (r = 0.60; P<0.01) between NDF concentration and CH 4 production. However, the total gas productions was negatively correlated (r =-0.75; P<0.01) with NDF content. The CH 4 production of feedstuff is influenced by NDF content.

Department of Animal Nutrition�� �aculty of Animal �cience�� �ishery and �arine �cience�� �tate �ni�ersity of �apua �� �aculty of Animal �cience�� �ishery and �arine �cience�� �tate �ni�ersity of �apua b �apua Barat Assessment Institute for Agricultural Technology�� �anokwari c Department of Animal �roduction�� �aculty of Animal �cience�� �ishery and �arine �cience�� �tate �ni�ersity of �apua Jln. Gunung �alju�� Amban�� �anokwari-�apua Barat�� Indonesia

The aim of the experiment was to evaluate fermentation characteristics and in vitro nutrient digestibility of fresh rice straw-based silage ensiled with addition of epiphytic lactic acid bacteria (LAB) inoculant. The experiment was arranged in a completely randomized design, with 2 × 2 factorial arrangement of treatments. The first factor was the ratio of fresh rice straw (FRS), tofu waste (TW) and cassava waste (CW) consisted of two levels i.e., 40 : 20 : 40 and 40 : 25 : 35, on dry matter (DM) basis). The second factor was the level of LAB inoculant with two levels ie., 0 and 20 mL/kg FM. The treatments were (A) FRS + TW + CW with the ratio of 40 : 20 : 40, without LAB inoculant; (B) FRS + TW + CW with the ratio of 40 : 20 : 40 + LAB inoculant; (C) FRS + TW + CW with the ratio of 40 : 25 : 35, without LAB inoculant; (D) FRS + TW + CW with ratio of 40 : 25 : 35 + LAB inoculant. Results showed that addition of LAB inoculant in silage increased lactic acid concentration (P<0.01) (3.7% vs. 5.2% fresh matter (FM) and V-score (84.6 vs. 89.6) (P<0.05). Concentrations of lactic acid and V-score were higher in silages with high cassava waste (A and B) (P<0.05) compared to silage with low cassava waste (C and D). The IVOMD of rice straw-based silage was affected by the ratio of silage materials and the level of LAB inoculant (P<0.01). There was no interaction between the ratio of silage materials and the level of LAB inoculant (P>0.05) on chemical composition, fermentation quality of silage and in vitro digestibility. It was concluded that mixture silage with ratio of 40 : 20 : 40 with the addition of LAB inoculant had the best fermentation quality and nutrient digestibility than other silages. ABSTRAK Tujuan penelitian ini untuk mengevaluasi karakteristik fermentasi dan kecernaan nutrien (in vitro) silase berbasis jerami padi segar yang diensilase dengan penambahan bakteri asam laktat (BAL) epifit. Percobaan ini disusun dalam rancangan acak lengkap pola faktorial 2 × 2. Dua faktor perlakuan, yaitu rasio jerami padi segar : ampas tahu : onggok (40 : 20 : 40 dan 40 : 25 : 35, berdasarkan bahan kering (BK)) dan 2 level inokulan BAL (0 dan 20 ml/kg bahan segar). Perlakuan terdiri atas (A) jerami padi segar + ampas tahu + onggok (40 : 20 : 40, berdasarkan bahan kering); (B) jerami padi segar + ampas tahu + onggok (40 : 20 : 40) + inokulan BAL; (C) jerami padi segar + ampas tahu + onggok (40 : 25 : 35); jerami padi segar + ampas tahu + onggok (40 : 25 : 35) + inokulan BAL. Hasil percobaan menunjukkan bahwa penambahan inokulan BAL pada silase meningkatkan konsentrasi asam laktat (3,7% vs. 5,2% bahan segar) (P<0,01) dan V -score (84,4 vs. 89,6) (P<0,05). Konsentrasi asam laktat dan V-score lebih tinggi pada silase dengan kadar onggok tinggi (A dan B) (P<0,05) dibandingkan dengan silase dengan kadar onggok rendah (C dan D). Kecernaan bahan organik secara in vitro dipengaruhi oleh rasio bahan silase dan level inokulan BAL (P<0,01). Tidak terdapat interaksi antara rasio bahan silase dan level inokulan BAL (P>0,05) pada komposisi k...