In order for stallions to be available for breeding, players must set them up for stud.

Steps:

1. Go to the stable.
2. Select the desired stallion.
3. Click the Set stud button.

Notes:

1. In order to be up for stud stallions must be at least 3 year old, be at least level 10 and have the breeding checks done.
2. Once marked for stud, the stallion will appear in the find horse list as being available 'for stud'.

Links: find horse, stable