We have some pullets that have been laying for a few months, I check them for fertility when I crack them just out of curiousity. One of the Production Reds has consistently laid an egg without a blastodisc at all. All the others have nice, clear, blastoderms. I can't really find any information on what could cause this. Is it a sign that she'll have reproductive issues? She's really healthy otherwise, she's the biggest of my Production Reds and very clearly the dominant in the flock. She's about 7ish months old.