I recently had another breeder make an interesting suggestion: put a drop of food dye in the vent of your hen to track who is laying which eggs. You'd know who is laying your big/small/colored eggs.
Thank you for this tip! I am trying to track which of my girls is laying which eggs because someone is giving me chicks with DQs. I plan on replacing my roo, but I want to know which girl it is anyways.