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This study was carried out to investigate some fattening and slaughter characteristics in intensive conditions of Brown Swiss young bulls in a private farm in Southeastern Anatolia Region. The young bulls in the study were grouped in four groups according to their initial fattening weights (176-225 kg, 226-275 kg. 276-325 kg and 326-400 kg). In terms of the environmental factors, the effects of initial fattening weight group and season were investigated. To determine the effects of environmental factors on fattening traits, general linear model (GLM) procedure was used. The young bulls had a least square mean (LSM) of 275.0 kg initial fattening weight and they reached to a LSM of 515.6 kg final weight at the end of the fattening for 180 days. The daily live weight gain during fattening was 1336 g. The effect of beginning to fattening season on total live weight gain in fattening was found to be significant. The dressing percentage of Brown Swiss young bulls were 58.6% and the effects of slaughter weight on dressing percentage were not found significant.