A mower-conditioner implement is equipped with a rotary disc cutter bar and associated with the cutter bar are a plurality of crop-lifting units that cooperate to define an upright lip that works together with transversely spaced ramp sections, of the respective lifting units, that incline downwardly to the front from transversely spaced locations along the top of the lip for lifting and directing cut crop to the conditioner. In one embodiment, the crop-lifting units are releasably coupled to the cutter bar, and, in a second embodiment, are formed integrally with the cutter bar.