Do not look here 说:
I wonder if you need to supply your cavalry with horses only on promotion or will you need to keep them supplied as they lose their mounts.
+1
I think horses should be pretty expensive to maintain, especially player character's super fancy spirited hunter.
I would be very pleased if troops' horses are persistent (breed, colour, markings, status, etc.).
Now that horse production is a thing, how about horse breeding to get high level horses based on good genetics and good enterprise management.