Jordi Gray, 17, of Owings Mills, with her horse, Magic Man, at Willow Wood Farm. Gray is a Jemicy School senior who has an equestrian scholarship to Oklahoma State next year.

The research found that the most valuable horse is a 5- or 6-year-old grey or chestnut gelding which is retrained in dressage or jumping with a clean bill of health. Horses listed as trained in ...