Our brood mares are selected on genetic, conformation, performances. it is important not to choose brood mares from average endurance horses or worst from horses who failed in competition !
it is not easy to improve the quality of endurance horse breeding, if it is based on bad female genetic, and improve it only using good stallions. Unless you agree to produce average horses for several generations, and only some time to time one performer.
Our mares used to compete in endurance, but some are still competing nowdays.