In Vitro Rumen Fermentability and Physical Properties of Bali Cattle Ration Based on Agro-Industrial by-Product with Different Ratio of Rumen Degradable Protein and Non-Fiber Carbohydrate

Abstract

HistoryThe research aimed to evaluate in vitro rumen fermentability and physical properties of Bali cattle with different ratios of rumen degradable protein (RDP) and non-fiber carbohydrate (NFC).The effect of the ratio of non-fiber carbohydrates to in vitro rumen degradable protein of the agro-industrial by-product based on ration for Bali cattle.The experiment was arranged in a 3x3 factorial completely randomized design with four replicates.The first factor was RDP level 55, 60, and 65%, respectively; the second was NFC 35, 40, and 45%.Feed was formulated based on nine combination ratios, i.e., R1=55:35, R2=55:40, R3=55:45, R4=60:35, R5=60:40, R6=60:45, R7=65:35, R865:40, R9=65:45.Parameters measured were physical properties included angle of repose, bulk density, and specific gravity, in vitro parameters were dry matter (DM), organic matter (OM), crude fiber digestibility (CFD), volatile fatty acid (VFA), and ammonia (NH3).Results showed that the formulated ratio based on RDP and NFC interaction RDP and NFC did not affect the bulk density and specific gravity.However, the RDP level significantly affected the angle of repose.In vitro tests showed no interaction between RDP and NFC on dry matter digestibility (IVDMD) and in vitro crude fiber digestibility (IVCFD).However, in vitro, the interaction between RDP and NFC influenced organic matter digestibility (IVOMD).RDP and NFC levels significantly influenced IVDMD and IVOMD.The interaction of RDP and NH3 did not significantly influence NH3 concentration and total in vitro VFA, but RDP level significantly influenced total VFA; meanwhile, NFC did not influence both NH3 concentration and total VFA.The combination of 65:35 (RDP and NFC) in beef cattle ration resulted in good digestion products, VFA, and NH3 to supply protein and energy.

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