Fellow uni breeder I see!
To breed a uni you must do the following:
- Both parents must be unis
- Both parents must be purebred (all unis are purebred anyway)
- Both parents must be the same breed (ex: father is a Connemara, mother must be a Connemara)
- Mare must be covered at precisely 6:23 GMT (unless she has Hestia's Gift)
Even then, there is only a 1 in 6, or 16% chance of a uni. BUT my friend adn I discovered that there is a 1 in 3 chance of a uni (33% chance) if the mare is covered int he first 10 seconds of uni time.