All my females except one are relatively young. A young redfoot Tortoise will start with infertile eggs, as she ages the fertility increases with age(assuming mature male present). The infertile eggs will blow eventually, some crack some blow. You can not give them too much calcium, calcium that is not absorbed passes straight through the body. I only give cuttlebone for calcium, no powder. They eat it at there own choice, it's obvious when a female is gravid because they devour the cuttlebone more than usual. Remember I'm talking about redfoots, I not sure if the same applies to the Mediterranean species. I would assume yes but have no experience to back that up. That's Gordons job. Lol.
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