Nutritional evaluation of rice straw silage was carried out with Sakha 102 and Giza 177 varieties sprinkled by El-Mufeed liquid and Effective Microorgansmis(EM1) with or without urea supplementation as well as untreated or ammoniated rice straw using adult Ossimi 1: Finnish crossbred rams- Also, feeding trial was concluded using twelve lactating buffaloes in the 3'Ifl to the 5':1 of lactation season, weighing 550—650 kg used after 8 weeks of lactation start in compete switch—back design to evaluate the three experimental rations contained different forms of rice straw. The first ration (R1) contained concentrate feed mixture (CFM) and untreated rice straw (URS). the second ration (R2) contained CFM and ammoniated rice straw (ARS), while the third ration (R3) contained CFM and rice straw silage (R33). Giza 1?? rice straw silage with EM and urea supplementation had significantly (Ps0.05) the highest digestibility coefficients of DM, OM and NFE and subsequently TDN, DE and DCP values. Moreover, nutrients digestibility and nutritive values increased significantly (P