Background And Objective: Medicinal herbs and aromatic plants could be used to manipulate rumen fermentation. This study aimed to evaluate the effect of adding herbal and aromatic plants at 1, 3, 5, 7% of total ratio DM supplementation of the incubation media of an in vitro rumen model.
Material And Methods: About 400±4 mg of feed sample (roughage and concentrate ratio of 45:55%) with each level, weighted into 125 mL glass bottles (6 bottles for each treatment), rumen fluid injected into these bottles and incubated at 39°C, after 24 h incubation digestibility of dry matter (IVDMD) and organic matter digestibility (IVOMD), total gas production (TG) and metabolic energy (ME) were studied.