Somewhere I read that one lady put food coloring on her hens vents....a different color for each hen. When the hen laid an egg, the food color smeared on the egg and she knew which chickens laid which eggs. Not sure if this really works, but it sounds logical. If you try this let me know if it works or not. My pullets are 19 weeks old and no eggs yet....hopefully soon....and then I may try this method myself.