I have two 19 wk girls that are laying. One has been laying 1 egg a day since Aug 7, the other started laying last week. My problem is the 2nd one laying has 3 eggs while she is on the roost and 2 have had soft shells and the last one didn't seem to have a shell. I do not have them on layer feed because I also have 10 girls that are 14 wks old. Can I feed them all layer feed now? I was told at the feed store I can't feed layer feed until a chicken is 17 wks old, and then other people say it is ok. I also heard that I could mix the 2 feeds together until the littles are 17 wks old. Please help!!!!