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Abstract The study was conducted to examine effects of supplementation of crude cellulase produced from Trichoderma viride – fermented copra meal (CM) on nutrient digestibility, apparent metabolizable energy (AME), digestive organs weight, protein and cholesterol content of breast meat of broiler chickens. A total of 200 day-old-male broiler chickens were used. The birds were fed with 5 different diets; T-1 = 0 g/kg CM, T-2 = 50 g/kg CM + crude enzymes, T-3 = 100 g/kg CM + crude enzymes, T-4 = 150 g/kg CM + crude enzymes and T-5 = 200 g/kg CM + crude enzymes. Feed digestibilities, digestive organs weight, protein and cholesterol content of breast meat were determined as parameters. On day 35, two birds from each replication were placed into metabolisme cages for digestibility measurement. A completely randomized design was adopted with five treatments and five replications. The digestibilities of protein, crude fibre, AME of the diets and cholesterol content of the breast meat of broiler chickens fed the rations with crude enzymes addition were better than those of birds fed the T-1. The response of protein and crude fibre digestibilities were curvilinearly over the increasing levels of CM in the diets and crude enzyme addition. Digestive organs weight, protein and lipid percentages of the breast meat were not affected by the treatments. Supplementation of increasing CM diets with crude enzymes from Trichoderma viride produced higher protein, crude fibre digestibilities and AME of the diets and lower cholesterol content of breast meat