The farmer is leaving for his vacation and he has trusted you to take charge of the horse farm while he is gone. The ponies at the farm are still very young, so you really have to put your heart and take good care of them. Feed them, water them, groom them, and watch them grow!
You can only take care one pony at the first time. But no worries, each time you comeple a level you will be given one more pony. Good luck and have fun!