Hi All, My three girls are turning 16 weeks tomorrow and just about done with there chick feed bag. Once that is done I am switching over to a bag of Scratch and Peck naturally free layer feed since we are expecting eggs soon "wink wink, hope hope, fingers crossed!" They are in a coop and run and free range for about 12 hours a week. Do I need to give them oyster shells as well? Or is that what the layer feed is for. Since they are not laying yet I can't judge by the eggs yet. Any help would be appreciated!