The objective of the present study was to compare in situ dray matter (DM) and NDF degradation coefficient of untreated or treated sesame (Sesamum indicum) stover (SS) with a solution containing urea, sodium hydroxide or sulfuric acid. Samples were obtained from the Iranian plant varieties adapted to grow in a semi-arid condition. The samples were manually chopped (5 cm length) and evaluated as untreated or treated with sulfuric acid (2 ml/100 g DM), urea (3 g/100 g DM), NaOH (4 g/100 g DM) or both NaOH and urea [NaOH as 4 g/100g DM was sprayed on SS and kept for 48 h, then urea (3 g /100g of initial DM) was added]. Present results indicate that the highest amount of a fraction of DM and NDF was observed in SS treated with sodium hydroxide (0.30 ± 0.020 and 0.08 ± 0.005, respectively). Sulfuric acid caused a significant decrease (p<0.05) in b fraction of DM (0.29 ± 0.014) and an increase in c fraction of NDF (0.06 ± 0.003). Urea did not alter the degradation coefficients of SS.

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