I found what at first looked like a small egg, only it had no shell, was rubbery and beige. I sliced it in 1/2 and it was 1/4" thick with something solid and brown in center. no odor on outside or when cut open? what could this be? my hens are 1 1/2 to 2 1/2 yr old. RR's black sexlinks, bo's and bpr .