Records of 16361 Baggara bulls purchased and fattened in 143 batches during 9 years (1992 -2000) at the Animal Production Research Centre (APRC) were used to examine the effect of year and season of purchase on the performance of fattening operations. The data were grouped into 9 groups according to year of purchase. The data were further grouped according to season of purchase into winter, dry summer and wet summer groups. Two way analysis of variance was used for statistical analysis. The number of animals/batch, purchase weight, selling weight, fattening period, daily body gain, purchase price and selling price averaged 114±61 animals, 217.0±42.04 kg, 254.0±46.09 kg, 49±27 days, 0.770±0.344 kg/day, 0.571±0.180 Dollar/kg live weight, 0.742±0.150 Dollar/kg live weight, respectively. The number of animals per batch and the purchase body weight increased with year advancement, whereas, the selling body weight, fattening period, the daily body gain, purchase and selling prices decreased with the year advancement. There was no variation imposed by season of purchase on the number of animals per batch and purchase and selling body weights. Whereas, the fattening period, daily body gain, purchase and selling prices were significantly affected by season of purchase. The study concluded that the fattening operations of Baggara bulls at APRC expanded successfully with years, and the season had important impact on the fattening operations.