About 2 years ago I replaced my free range flock with 3 Sexlink chicks. I have never been happy with egg production. Summertime it was maybe 1 egg every 2 days, now it slacked off to maybe 1 every 3 or 4 days. They only are out to free range for a couple of hours in the afternoon so I am sure they are not laying them somewhere other than the nest box. One of the hens has a spur on one leg about an inch long, the other leg one about half inch. She started growing them before she was a year old, and they do not seem to be growing any larger. Since the birds look almost identical, is there some easy way to tell who is laying and who is not?