An experiment on the use of Complete Rumen Modifier (CRM) to improve dairy cowproductivity and to mitigate enteric methane production has been conducted. Sixteen lactating dairycows were distributed into 4 groups by using compelete randomized design (CRD). Group I (Control)fed by basal diet consisted of elephant grass and concentrate 7.5 kg/hd/dy (CP 16% and TDN 70%),Group II (Pro. Woodii) fed by basal diet + probiotic Woodii, Group III (Pro.Noterae) fed by basal diet +probiotic Noterae; Group IV (CRM-Noterae) fed by basal diet + CRM + Pro.Noterae. Measurementswere conducted on body weight gain, average daily gain, feed conversion ratio, milk and methaneproduction. Results showed that CRM-Noterae increased ADG by 72% (1.29 vs 0.75 kg) and improvedFCR (9.2 vs 15.6). Probiotic noterae as single treatment or combined with CRM increased fat and totalsolid content of milk from 3.18% and 10.58% in control group to become 3.91%; 11.31% and 3.55%;11.02%, respectively. The lowest methane production was recorded in Group IV. The combination ofCRM and Noterae reduced percentage of methane production by 14%. It is concluded that combinationof CRM and Noterae can improve dairy cow performance and decrease methane production. ProbioticNoterae improved milk quality.