I have never had a slug - but I have had infertile eggs - so I would think that a slug has a more underlying reason than just being infertile. I would also bemuse that since its said that big girls slug out a lot - that it may be an issue with mom or her health. Perhaps moms ova weren't right or she didn't thermo regulate herself very well during her development????? Or it could just be a quirk.

Sorry about your slugs Heather - hope you get lots next year.