RETENSI PROTEIN PADA KERBAU MUDA JANTAN YANG MENDAPAT AMPAS BIR SEBAGAI PENGGANTI KONSENTRAT (Protein Retention in Young Buffalo Bulls Fed Brewery By-product as Fabricated Concentrate Substitute)

Abstract

Suatu penelitian telah dilaksanakan dengan tujuan untuk mempelajari retensi protein pada kerbau jantan muda yang mendapat ampas bir sebagai pengganti konsentrat jadi. Sebanyak 8 ekor kerbau jantan berumur sekitar I tahun, dengan bobot badan awal rata-rata 160,32 kg (CV= 11,12%), dialokasikan ke dalam Rancangan Acak Lengkap (RAL) dengan 2 perlakuan dan 4 ulangan. Perlakuan yang diterapkan adalah penggantian 50% konsentrat dengan ampas bir (TO: Jerami padi ad libitum + konsentrat jadi 1,25% dari bobot badan; Tl: Jerami padi ad libitum + konsentrat jadi 0,625% dari bobot badan + ampas bir 0,625% dari bobot badan). Jumlah konsumsi total dan kecernaan bahan kering (BK) pada kedua perlakuan tidak berbeda nyata (P>0,05). Konsumsi dan kecernaan BK pada TO adalah 4340 g/hari dan 68,73%, sedangkan pada TI adalah 5086 g/hari dan 68,32%. Konsumsi protein pada TI (704 g/hari) lebih tinggi daripada TO (569 g/hari), meskipun secara statistik tidak berbeda nyata (P>0,05). Kecernaan dan retensi protein pada T1 (77,56% dan 69,66%) dan TO (76,50% dan 68,61%) tidak berbeda nyata (P>0,05). Sementara itu, pertambahan bobot badan harian (PBBH) pada TI (665 g/hari) nyata (P<0.05) lebih tinggi daripada TO (378 g/hari). Berdasarkan hasil penelitian ini dapat disimpulkan bahwa penggantian konsentrat dengan ampas bir tidak berpengaruh terhadap retensi protein. Namun demikian, penggantian konsentrat dengan ampas bir mampu meningkatkan produktivitas kerbau jantan muda. Kata kunci: kerbau, ampas bir, retensi protein, konversi protein ABSTRACT An expeririment was carried out to study protein retention in young buffaloe bulls fed brewery byproduct as a substitute of fabricated feed concentrate. Eight male buffaloes, aged about 12 months, weighed 160.32 kg (CV=11.12%), were allocated into a completely randomised design with 2 treatments and 4 replicates. The treatments applied were substitution of 50% feed concentrate by beer industry by-product ( TO: rice straw ad libitum + fabricated feed concentrate as much as 1.25% of body weight; T: rice straw ad libitum + fabricated feed concentrate as much as 0,625% of body weight + beer industry by-product as much as 0,625% of body weight). Dry matter intake and digestibility of the both treatment were not significantly different (P>0.05). Dry matter intake and digestibility of TO were 4340 g/d and 68,73%, respectively, while those of TI were 5086 g/d and 68,32%, respectively. Protein intake of T1 (704 g/d) was higher than that of TO (569 g/d), although statistically was not significant (P>0.05). Protein digestibility and retention of TI (77.56% and 69.66%) and TO (76.50% and 68.61%) were not significantly different (P>0.05). However, liveweight