USU-Apogee was back-crossed with line 3-2-3 in 1999 to get an improved super dwarf wheat. Sixty-eight seeds were planted from the F1 generation. This table summarizes the two year selection process from F2 to F10 generations. USU-Perigee is the same height as Super-Dwarf but yields 30% better.
USU Crop Physiology Lab, "Historical Summary of the Selection of USU-Perigee" (2002). Dwarf Crops. Paper 3.