Chemical compositions of rice for forage harvested in production sites and effects of conditions of storage on fat acidity of brown rice and unhulled rice
2013
Katsumata, M. (NARO Institute of Livestock and Grassland Science, Tsukuba, Ibaraki (Japan)) | Ishida, A. | Toyoda, H.
In order to obtain information on chemical composition of rice for forage harvested in production sites, we analyzed chemical compositions of 25 samples (14 varieties) of brown rice and 17 samples (10 varieties) of unhulled rice harvested in 2008 and 2009. Further, we determined fat acidity of brown rice and unhulled rice after kept at either 28degC 80% or 4degC. All the chemical compositions analyzed were different between the brown rice and the unhulled rice (P<0.01). Contents of gross energy, crude protein, crude fat, and total phosphorus were higher in the brown rice while those of crude ash, calcium, and neutral detergent fiber were higher in the unhulled rice. Contents of essential amino acids of the brown rice were higher than those of the unhulled rice (P<0.05). There was a positive correlation between the content of crude protein and that of total phosphorus both in the brown rice and the unhulled rice (P<0.05). Fat acidity of the rice grains kept at 28degC 80% was higher than that of the rice grains kept at 4degC (P<0.01). Fat acidity of the brown rice was higher than that of the unhulled rice (P<0.01). On the other hand, fat acidity of the unhulled rice did not change even though kept at 28degC 80%. The positive correlation between the content of crude protein and that of total phosphorus suggested that higher input level of fertilizer resulted in higher content of crude protein. When the rice grains are kept without control of temperature and humidity, it is advisable to keep as unhulled rice.
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