To evaluate forage utilization potentiality of exotic breeds of rabbit ten New Zealand White (NZW) and ten Soviet Chinchllla (SC) rabbits of ten weeks of age having uniform size and weight were taken from institute form and productive performance was studied. Each rabbit was provided fresh congosignal grass (Brachiera ruziensis) @ 250 g/d in the morning and concentrate pelleted feed @ 75 g/d in the afternoon. All growth traits, feeding parameters, meteorological parameters were recorded. At the end of six weeks trail data were analysed statistically and it was found that breed difference in all traits and parameters was not significant (P > 0.05). Absolute weight gain, average daily gain, total weekly DM intake, average daily DM intake were higher in SC than that in NZW. FCR in SC was lower than that in NZW indicating better utilization of grass in SC. No mortality occurred which indicated that exotic breeds of rabbit are also possible to maintain on 50% congosignal grass feeding replacing concentrate feed.