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All horses are assigned a number that corresponds with their letter grade. SSS+ = 21 D- = 1.
The Grade Improvement calculated by taking: avg. parents grade rating – offspring grade rating.
A Grade Improvement of 1 implies the offspring is 1 grade better than both parents.
Ex: Sire Grade: A, Dam Grade: A, Offspring Grade: A+ would have a Grade Improvement of 1.