Two diets with or without untreated/treated (anaerobically fermented) cotton seed hulls (CSH) were fed to cross-bred calves having average body weight of 87kgs for a period of 60 days. Daily gain was significantly ( P<0.05) higher in treated group calves as compared to untreated CSH based diets. Total dry matter intake was significantly (P< 0.05) lower in treated group compared to untreated and control group calves: Dry matter digestibility percentage varied significantly (P<0.05) among the groups being significantly higher in control group followed by treated and untreated CSH based diets.