ehh some would say too young, some would say fine. personally: do they look nice and big and healthy, plus if they are showing to be ready for it? I would say why not if it was yes to both of those. then: makin sure you will have the cages then though for the litters, and would you be able to separate the does into their own cages if they start fighting etc? or if you were planning to put them in separate cages after ya bred em anyhow. because I know with my luck as soon as I need them to stay friendly to their cage mates, then they will start stuff and I need to separate em.