Can't seem to tame Horses or breed them

Hi,

I spawned in the horse using an egg

In /Gamemode s
Step 1: Materials. Apples Horse Saddle
Step 2: Feed the horse untill it has hearts coming out of it. ( no hearts after 512x apples)
Step 3: Spawn lots of horses tried again not working.
Step 4: Tried to breed the horses for the babies to try to tame them. Breeding failed.