How old is your female?
Is this her first litter?
How long was the male able to breed with her?
Are you sure he was in the at the right times, and not at the end of her cycle?
Did you try to cool her for breeding?
What were the temps during gestation?
These are the questions I would be asking myself if I was in your shoes. Especially the first three.
It's not uncommon for first time "Moms to be" in the Boa family, to produce a high number of slugs. Especially if she's still a little young. The still born can be attributed to that also, or it could be caused by something else. Was it fully formed? Any congenital defects that you could see, like kinks, or not fully formed jaws? That would indicate maybe a temp issue during gestation.
Pretty hard to put a finger on an actual cause. All you can do is question yourself, keep track of what you do, what works, and what don't. If you're going by the "book" you'll likely duplicate your problem. Books, peoples caresheets, etc are merely peoples interpretations of whats worked for them. It doesn't work for everyone all the time. Use them as guidelines only, and go from there.
Anyway, some things to ponder if nothing else. Sorry I can't offer much more. Better luck next time.
