This study was conducted to determine the effect of chemical treatment on fermentative activity and nutritive value of Sesame stover by in situ and in vitro gas production techniques. Treatments were untreatedSesame Stover (SS), SS+Sulphunc Acid (SSA), SS+Urea (SSU), SS+NaOH (SSN) and SS+Urea+NaOH (SSUN). Nylon bags (9x17 cm) each containing 5 g sample (2 mm screen) were incubated in the rumen of fistulated sheep for 0.0, 4, 8, 16, 24, 36, 48, 72 and 96 h to determine the ruminal disappearance. Cumulatve gas production was recorded at 2, 4, 6, 8, 12, 24, 36, 48, 72 and 96 h of incubation and the equation ofP = A (l-e\"d) was used to describe the kinetics of gas production. Results showed that NDF concentration of the samples was significantly (p<0.05) decreased by sulphuric acid treatment also the urea caused a significant (p<0.05) increase in CP content of sesame stover. Dry matter ruminal disappearance was significantly (p<0.05) increased by NaOH treatment. Moreover , the in situ quickly degradable fraction ofCP was increased (0.625±024) when urea applied. The b fraction and rate of gas production were significantly (p<0.05) increased (72.32±2.88) and decreased (0.029±0.002), respectively by adding the NaOH to SS.

Keywords