This study was carried out at districts Ba Vi (Ha noi) and Thanh Ba, Phu Tho, Tan Son (Phu Tho) and at lab of HUA from 2011 to 2012. The amount of cassava stem in the area is great and can be determined by regression equation Y (cassava stem) = 0.738X (cassava root) - 0.235 (R=0.92; P0.01). Cassava stem samples were taken from cassava stem after harvesting to determine chemical composition, HCN contents. In laboratory, cassava stem was alkalined with urea at 1.5, 2.0, 2.5 percent (on a fresh basic). Cassava stem was also ensiled with sugar mollases at 0, 2, 4, 6 percent (on a fresh basic). The study showed that cassava stem was very poor in crude protein (3.76 percent of OM) and minerals (3.02 percent of OM) but rich in fiber (51.39 percent of OM). However, crude protein was increased and fiber content was reduced after alkalining cassava stem with urea. The HCN content was very high in fresh cassava stem (106.98 mg/kg), but decreased rapidly with storing time and processing methods (19.1 mg/kg after 7 days of alkalining and 20.54 mg/kg after 14 days of ensiling). Cassava stem alkalined with 2 and 2.5 percent urea had a light yellow colour with smell of ammonium and that ensiled with 4 and 6 percent sugar molasses had a yellow colour with pleasant smell. Organic acid was produced (1.16-1.24 percent) after ensiling with sugar molasses can help to preserve nutritional value of cassava stem during 30 days of storage. Using alkalining with 2.0-2.5 percent urea and ensiling with 4-6 percent sugar molasses can preserve cassava stem for ruminants. Using cassava stem silage with 6 percent molasses and alkaline with 2.5 percent urea at 20 percent dry matter ration of beef Sind growth tends to increase the growth rate and thus significantly reduce FCR.
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