The book that I have been referencing since getting my first flock of chicks suggests switching from 18% chick starter feed to 16% protein feed at 15 weeks until 22 weeks or until they begin laying. The bag of chick starter I have (Kalmbach 18% start right chick feed) says I can feed this until they start laying. I'm having a hard time even finding a 16% protein feed that is for pullets and not laying hens. I would appreciate any thoughts on whether I need to switch or not. Thanks in advance!