To reduce dry cost and transportation storage expenses of storing feed rice, we investigated the results of storage outdoors for long periods. After husking unprocessed fresh paddy rice, batches of brown rice were dried for different times resulting in different amounts of residual water, and placed into polyethylene plastic bags 0.08 mm thick. Brown rice with a water content of 16% immediately began to show growth of mold after being placed in storage. Brown rice with a water content of 14.8% could be stored without mold formation for 6 months. However, the amount of mold began to increase from the 9th month. Brown rice with water contents of 12.6% and 13.5% could be stored for 12 months with less mold that conventional livestock feed. These observations indicated that limiting the water content in brown rice to below 13.5% at the start of storage would prevent the formation of mold, which reduces the value of stored feed rice. Therefore, this would enable outdoor storage of brown rice for 1 year.
