Experiments were carried out to evaluate the performance of hammer milling machine for producing untraditional poultry feeds by recycling hatchery by-product wastes. To fulfill the objective of this research work, some operating parameters affecting the performance of the hammer milling machine were taken into consideration, four hammer revolving speeds (1000, 1500, 2000 and 2500 rpm), two sieve hole diameters (2 and 4 mm) and three feed rates (0.05, 0.07 and 0.09 Mg/hr.). Evaluation of the

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... er milling machine was carried out taking into consideration fineness degree, machine productivity, microbiological tests, energy requirements, and operational cost. The obtained results revealed that machine productivity, fineness degree microbiological tests, energy requirements, and operational cost were in the optimum region under conditions of 2500 rpm hammer revolving speed, 4mm sieve hole diameter and 0.09 Mg/hr., feed rate, while the other feed rate from 0.05 Mg/hr., to 0.07 Mg/hr., and 0.09 Mg/hr., and the other speeds (1000, 1500, 2000 and 2500) rpm.