One little tip is to keep ones with high confidence. They tend to perform better than those with low rating. And winning doesn't seem to make a difference on the confidence. It is either born with high rating on not and I can't get it to rise even if the horse continues to win.
As to the potential bar, I prefer horses that has high potential rating when just born. There is no need to try to raise it since it's already at near max. I don't even have to race them and can already tell it will do well.
Example of 3 horses 2 with low confidence and one at a decent level. although all 3 are just newly born, I can tell which ones will be a very good horse.
