Each generation is identified as a class that is produced and handled to maintain genetic purity. The number of generations or multiplications is limited thus ensuring that seed sold to a farmer is like the original Breeder's seed. The limited generation system, when coupled with strict production and seed standards, assures genetically pure high-quality seed. When a Registered class is designated, it is the parent stock for the production of Certified Seed. Certified seed is the progeny of Foundation or Registered seed.
Certified seed is the planting stock recommended for commercial production.
The testing process includes field testing to identify the predictable traits for a specific variety. Most of the testing occurs before a variety is released. CSU contracts with farmers to raise these crops and the fields are inspected during the production season for weeds, diseases and varietal contamination. Varietal contamination is caused when a variety other than the intended variety is growing with the foundation seed variety. Only one generation can be raised during the production year unless the seed is shipped to South America to produce a generation during the North American winter.