My Cuckoo Marans are 8 months old. In the beginning they were laying rich dark brown speckled eggs - absolutely beautiful. Now, since October, they have been laying very light brown, non-speckled eggs. I miss my beautiful dark brown ones. They forage on 5 acres 6 hrs/day and I did change their food a few months ago from lay mash to lay crumble, and I throw in a little oyster shell. None of my other breeds have had any egg color change - just the Cuckoo's. Will I ever get the deep brown color back?