The Tier 3 and Tier 5 horse you receive from purchasing a Travelers and/or Explorer’s Package will only have 1 breed. If you choose to reset your horse's breeding count after using the first breed it will only have 1 breed instead of 2.
These horses cannot be sold (to the Stablekeeper/Horse Market) or exchanged.
However, the horse can be sent to the Imperial (Training) Delivery for silver and a few Shiny Golden Seals.
Thank you for your understanding!