The experiment was conducted from 9/3 to 11/4/2023 to study the effects of using increasing percentages of dried dates peels (0, 15, 30, & 45%) on the concentrated fodder to study its effect. on dry and organic matter digestion coefficients, methane gas production, volatile fatty acid, ammonia, pH, and total numbers of bacteria. The results show that there was a significant effect (p≤0.05) on the digestibility of dry and organic matter at 30% of date by-products. The results also showing that treatment T3 was superior in the production of total gas and methane gas for all incubation periods. The results also positive for the characteristics of ammonia nitrogen and Volatile fatty acids, T4 outperformed the rest of the treatments in total bacterial counts.