The study was taken up to assess the effect of herbs containing essential oils (EOs) viz. Jaiphal, Suva and Haldi supplemented individually at 1 to 3% levels on TMR varying in different R:C on the in vitro methane production and utilization of nutrients. Supplementation of jaiphal, irrespective of their level had significantly (P | Invitro evaluation of herbs containing essential oils supplementation on methane production and nutrient digestibility of total mixed rations