Each horse has a different racing skill which is decided by four factors, including Bloodline, Genotype, Rarity and Generation.
There are other stats that which have direct effects on a horse's overall performance from on-track to off-track, including:
- Stamina: The endurance of your horse
- Speed: How fast can your horse run
- Recovery: Horses with better overall ability will recover Stamina faster.
To give your horse the best chance to perform at its peak, you should wait for the Stamina to recover to its fullest (100%)