The Effects of Various Species of Thymus Essence on Gas Production Parameters, Dry Matter and Organic Matter Digestibility and Ruminal Fermentation Parameters in In Vitro

Two experiments were conducted to evaluate the effect of essence of various species of Thymus on in vitro gas production parameters and digestibility of dry matter and organic matter. Various species of Thymus medicinal plant was collected from different area: Shriaz (Zataria multiflora), Esfarayen (Thymus transcaspicus lamiaceae), Shahrood (Thymus fallax), Golestan forestry (Thymus transcauasicus) and Gorgan (Thymus vulgaris). Essence of collected samples was taken by macro wave at 110 0C and 450 nm for 45 minutes. Treatments were including: 1) control containing basal diet with forage: concentrate ratio 50:50 (without essence) and treatment 2 till 6 containing basal diet and essence of various species. Results showed that adding essences from various species had significant effects on potential gas production and gas production rate (p