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A study has been conducted to determine the quality and effect of seaweed (Ulva lactuca) as a substitute feed for Bali weaned bull in the dry season with different energy levels. The research was conducted in two stages of in vitro treatment to determine the ideal level of U. lactuca flour with treatment of RA= hay natural grass; RAK= RA + concentrate; RAKU5= RAK + U. lactuca 5%; RAKU10= RAK + U. lactuca 10%; RAKU15= RAK + U. lactuca 15%; RAKU20= RAK + U. lactuca 20%. Stage two used Latin Square design with treatment of R1 = EM 7,3 MJ, R2 = EM 8 MJ dan R3 = EM 8,7 MJ. The results showed that the ideal level can be used is 15% with dry matter digestibility and the highest organic digestibility is 77.79 and 78.56%. The second stage is feeding U. lactuca flour 15% from total ration with different energy level for nine Bali weaned bulls with the purpose of knowing the level of intake and digestibility with treatment R1= 7.3 MJ; R2= 8 MJ; and R3= 8.7 MJ EM. The results showed that substitution of U. lactuca flour 15% had no negative effect on intake and digestion. The feed with 8 MJ energy ration had the same intake and digestibility value as 8.7 MJ but higher than the 7.3 MJ energy ration.

Rumput Laut (Ulva lactuca) sebagai Pakan Substitusi Sapi Bali Sapihan di Musim Kemarau dengan Level Energi yang Berbeda