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The behaviour of the bulk thermal conductivity of rough rice above and below glass transition temperature was examined. The thermal conductivity values were measured using the line heat source method at initial temperatures of 3 to 698C and moisture contents of 92–170 % wet basis. The thermal conductivity values were determined using the maximum slope method. It was found that the thermal conductivity of rough rice increased with increasing moisture content. A multiple regression equation relating thermal conductivity to temperature and moisture content was developed through stepwise regression analysis. It was found that the thermal conductivity changed little below and increased considerably above the glass transition temperature