This study was carried out in the Faculty of Agriculture, Sana’a University, to evaluate the effect of four chemical treatments; sodium hydroxide (NaOH), hydrogen peroxide (H2O2), ammonium hydroxide (NH4OH) and urea, on the nutritive value of sorghum stovers (kassar and husher) which represent the most common source of ruminant animal feed under Yemeni condition. All alkali treatments significantly increased (P< 0.05) both stovers fiber fraction contents (ADF and NDF), with the NaOH treatment having the highest significant effect ,while urea treatments appeared to have a low effect on such parameters. However, the obtained results showed that urea treatment significantly (P<0.05) has increased both kassar and husher stovers crude protein content. In the in situ study all chemical treatments increased significantly (P<0.05), DM disappearance rates at different incubation times (24, 48 and 72 h.). Highest improvement in DM disappearance values of kassar and husher stovers obtained with the NaOH treatments. When urea treatments showed to moderately improve (P<0.05) DM disappearance of both treated stovers.
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