Introduction: The high cost and limited availability of traditional feeds at certain times of the year is one of the biggest constraints to animal production. This study aimed to demonstrate the effect of using dried date peels, and baker's yeast (Saccharomyces cerevisiae, S.s) in different incubation periods on rumen fermentations. Three levels of dried date peels (15%, 30%, and 60%), with different baker's yeast (Saccharomyces cerevisiae, S.C.) are used in this study in vitro condition. Results: The different treatments used in this study had a significant increase in ruminant gas production. Conclusion: Baker's yeast (Saccharomyces cerevisiae, S.C.) and date peels do not affect reducing rumen gas, indeed, these treatments increase the gas produced by the feed in vitro conditions.