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ABSTRACT A conventional rasp-bar cylinder combine and single-and double-rotor combines were evaluated for their effect on breakage, damage, and germination percen-tages of corn. Field harvest tests were performed at average corn moistures of 28.8, 20.3, and 18.6 percent and were replicated three times. Corn samples were col-lected from the clean-grain auger and the tank auger at each of three cylinder or rotor speeds. In addition, com-posite threshing and separating losses were determined for each test run. Corn breakage was less than 1 percent for all three combines at all moisture contents and cylinder or rotor speeds. At the two highest moistures, breakage did not differ significantly among the various combines or the cylinder and rotor speeds. However, at an 18.6 percent moisture content, the single-rotor combine produced significantly less breakage in the clean-grain-auger samples than did the double-rotor combine, while breakage in samples from the conventional cylinder com-bine did not differ significantly from that for the other two combines. Composite separating and threshing losses did not differ significantly among combines at any moisture or any cylinder or rotor speed.