Have Takakura order you a male and female chicken. Some of her eggs she lays are fertilized. INSETAD of selling them, put them in the Incubacator located in the chicken coop. It will take a few days for the chick to hatch, then wait until they are full grown for this next step. Have Takakura sell them for around 450g instead of the 40g some you would have gotten for the egg itself. Note: Chickens don't lay fertilized eggs everyday, and you have to be patient to make money this way. Have fun!