Gray/roan horses aren't uncommon, but there haven't been many to win the Kentucky Derby. Only eight have achieved the feat, with Giacomo being the last in 2005. Twenty years later, three gray/roan ...

The deciding factor is the number of copies of a small DNA sequence within the gray coat gene carried by each horse ...

Color is as good a reason as any for the casual Derby bettor, and gray horses have long held a special place in the hearts of that group. No gray or roan horse has won the Derby since Giacomo in 2005.

Three gray/roan horses, all descendants of Secretariat, are running in the 2025 Kentucky Derby. Only eight gray/roan horses have won the Kentucky Derby, the last being Giacomo in 2005. Gray/roan ...