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Articles by M. Niimi
Total Records ( 2 ) for M. Niimi
  M.M. Rahman , M. Ikeue , M. Niimi , R.B. Abdullah , W.E. Wan Khadijah , K. Fukuyama and O. Kawamura
  A survey of oxalate and its related mineral contents in selected fodder plants was conducted in two regions of subtropical Okinawa, Japan and of tropical Savar and Shahzadpur, Bangladesh. A total of 31 samples were taken from 13 fodder species in Okinawa, Southern part of Japan and of 63 samples from 27 fodder species in Bangladesh. The data of both regions revealed that the majority of fodder plants accumulated lower contents of oxalate than the critical level for toxicity at more than 20 g kg-1 DM, while few fodder species (Pennisetum purpureum and Brachiaria mutica) in Bangladesh and only Setaria sphacelata in southern part of Japan reached this critical level. In most of the cases, no relationship was found between oxalate and mineral contents in the plants tested. The results from the present study demonstrate that the oxalate content in tropical fodder species may vary in a wide range, mainly depending on plant species. To be noted is that some fodder species could accumulate oxalate at so high content as might be toxic to ruminants in certain conditions.
  M.M. Rahman , M. Tateyama , M. Niimi , R.B. Abdullah , W.E. Wan Khadijah and O. Kawamura
  Oxalate concentration in forage plants is important, because it results mineral deficiency in ruminants. Data on oxalate concentration in forage plants in conjunction with cutting and uncutting conditions throughout the growing period are limited. This study was aimed to investigate the changes in oxalate and some mineral concentrations of setaria (Setaria sphacelata). The plants were harvested at different stages (vegetative, boot, pre-flowering, flowering and seed) of maturity and at about 50 cm in length of regrowth (second to sixth cuttings) for evaluation of soluble oxalate, insoluble oxalate and some mineral concentrations. Soluble oxalate and total oxalate concentrations, as well as mineral concentrations, decreased with advancing maturity. Both oxalate concentrations (soluble or insoluble) were higher in leaf compared to stem. Soluble oxalate and total oxalate concentrations of regrowth were the highest at third cutting and lowest at sixth cutting. Insoluble oxalate concentration of regrowth was almost similar in all cuttings, except for the sixth cutting. The highest concentrations of potassium, sodium and magnesium of regrowth were observed at third cutting, while the highest concentration of calcium was observed at sixth cutting. A relationship between oxalate and mineral concentrations was partially observed. Results suggest that cutting materials of setaria from June to October could achieve oxalate levels that are toxic to ruminants.
 
 
 
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