Tables work from TOP - BOTTOM
The feeding amounts may depend on your horses weight and breed. The potential gained will also depend on the season so if it's winter your horse will have less energy to do games so you may not be able to fit some games in, if you can't fit in lets say 1 hour of games don't worry best not fit it in on the same day otherwise your foal won't have enough energy for the next day's games then you loose even more potential, but if your lucky and its summer you should be able to get the maximum potential gain from your foal. Make sure your horse has atleast 20% energy to go to bed and he/she goes to bed before midnight!
From this method your foal will gain 1.2 potential and about 0.2 in each skill