Here is some interesting reading: all of these mares have achieved "preferent" status with the KWPN.
The table reads across the top:

Mare name
Mare number (yr of birth first)
Off spring names
Father of each off spring
Each off spring predicate

KWPN mares start their actual breeding careers in the spring, when they are also presented at studbook selections throughout the country. Expert sportsmen and -women assist the KWPN jury on these occasions in assessing dressage and jumping talents of the riding horses and Gelder horses on the basis of free action and in case of jumping horses free jumping. Harness Horse mares are judged in hand for type and movement.
When considered worthy, the 3-yr-olds are then registered in the main studbook and branded with the proud KWPN lion. The best mares of these selections are then showed at provincial selections. Only the very best KWPN mares qualify for presentation at the National Mares Show, where the finest and best-moving mares are judged by an international jury.
The potential of the mares is tested in two or five week mare performance tests or a one day IBOP test.
For registration in the studbook KWPN mares have to meet minimum requirements for movements and conformation. Better mares can earn the ’ster’ predicate at provincial ('central') selections/keuringen.
The higher ranking ’keur’ predicate is only awarded to mares that have produced offspring and have passed a performance test with good results. To emphasize the importance of soundness, the KWPN created the 'PROK' and ’elite’ predicate for mares that passed extensive X-ray examination.
Mares that have produced at least three offspring with remarkable conformations and actions receive the ’preferent’ predicate.
When a minimum of three of her offspring perform excellently in the sport, a KWPN mare will receive the ’prestatie’ predicate, and if she performs well herself in dressage or showjumping or in harness, she may also be awarded the ’sport’ predicate.

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