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Japanese animal husbandry is dependent on a large amount of imported feed,especially corn and soybean.The former is susceptible to unstable international grain prices.In recent years,biofuel is a big demand by soaring crude oil prices.Corn account for over 90% of the biofuel raw materials,so that the demand for the biofuel is increasing (RFA 2011).However,the corn yield has been unstable by meteorological disasters that caused by global warming.