Abstract
The research was conducted in a cow pen belonging to the Anhini Lestari Livestock group in Karanganyar Regency. The purpose of this research are 1) to examine the effect of giving fermented rice straw in rations to the performance of beef cattle; 2) to assess how much fermented rice straw can replace the elephant grass. The design was used a completely andomized design in one way pattern as 3 types of treatments and each treatment was repeated for 4 times. This research used 12 heads of PO cattle, about 2 years old cow, which were treated with the formula ration as follows: T0: 60% concentrate + 40% elephant grass; T1: 60% concentrate + 20% elephant grass + 20% fermented rice straw; T2: 60% concentrate + 20% the elephant grass + 20% the rice straw without fractionation. Variables that is observed including the consumption of dry matter, consumption of crude protein and daily weight gain. The obtained data were analyzed using variance analysis with a level of 1% and 5%, if there were differences between treatments Duncan’s New Multiple Range Test was carried out. The results of this research showed that the utilization of fermented rice straw in the ration had a very significant effect on the performance of PO beef cattle. The best treatment in improving the performance of PO cattle was in T1 treatment, namely PBBH of 440 g/head/day; BK consumption is 21075 gr/head/day; PK consumption of 2264,529 gr/head/day. It can be concluded that fermented rice straw using a combination of Aspergillus niger and Trichoderma mutants AA1 can replace elephant grass by 20%.
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