If you can narrow it down to a manageable number of possible hens you can always use the food coloring in the vent trick. lol
Once I don't have restrictions for my wrist, I want to do the egg dye on vents so I an see production of our girls.
With my 10 girls, I should have kept better track of who it was. But as soon as I was about to do it, it stopped. Are any of your girls molting?
We have had some going through soft molts throughout this winter at different times.
Thanks guys