Primary Stable
If you choose the NHC as your Primary Stable, you will be allowed to upload 25 horses to begin with.
After week 4, the stable size increases to 30 horses, and up to 36 after Week 8. You will be allowed a maximum of 6 retirements, to be used at your discretion, when the upload windows are open. No horses, can be uploaded, transferred or retired, when upload windows are closed.
Regardless of whether the UKRA, USRA or NHC is your primary stable, each trainer is limited to a max number of 5 transfers between stables. Each horse can only be transferred once in a season.
Secondary Stable
If you've chosen the NHC as a Secondary Stable, you will be allowed 12 horses at the start, 15 after week 4 and 18 after. You will have a total of 3 retirements.