The study was conducted to assess the effect of the addition of tannins, saponin and their combinations on the feed, as defaunation agent in the dry matter and organic matter digestibility and ADF, NDF degradability. The study used an experimental method with a completely randomized design. The treatments were T0 : feed without supplementation; T1: feed supplementation with 1,2% saponin; T2 : feed with supplemetation combined of 0,5% tannin and 0,9% saponin; T3 : feed with supplementation combined of 1,0% tannin and 0,6% saponin; T4 : feed with supplementation combined of 1,5% tannin and 0,3% saponin and T5 : feed with supplementation with 2% tannins. The result showed that DMD and OMD increased with treatment added combination of tannin and saponin. The best result for DMD and OMD in combination of 1,5% tannin and 0,3% saponin. Degradability of ADF and NDF was decreased Program Studi Magister Ilmu Ternak Program Pascasarjana Fakultas Peternakan dan PertanianUniversitas Diponegoro Semarang on the supplemented feed.The addition of a combination of tannins and saponins in the feed at dose of 1% tannin and 0.6% saponin showed the best result that increased of DMD and OMD and give good value on NDF and ADF degradability. Kebutuhan masyarakat akan protein hewani yang meningkat harus diimbangi dengan peningkatan produktivitas ternak. Permasalahan produksi daging yang masih rendah pada peternakan rakyat disebabkan oleh manajemen pemeliharaan yang masih mengandalkan pakan hijauan berkualitas rendah. Hal ini dapat menyebabkan kecernaan pakan rendah dan terjadinya defisiensi nutrien. Pemberian pakan tunggal rumput belum mampu memenuhi kebutuhan nutrien baik bagi mikroba rumen maupun ternak itu sendiri, sehingga masih dibutuhkan bahan pakan lain sebagai pelengkap (Christiyanto, 2005). Untuk itu diperlukan pemberian pakan yang bermutu baik secara kualitas maupun kuantitas. Pemberian konsentrat yang mengandung protein tinggi mampu mengaktifkan mikroba rumen sehingga meningkatkan deaminasi dan akhirnya meningkatkan kecernaan pakan.
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