Ferus is the exception to the 'only males can pass down primal cubs' rule. You can see the full list of inheritable mutations on the wiki here which includes it. There's also more detailed info on the ferus section of the primals page here, as well as the FAQ at the bottom there.

So, yes, there is a chance that a female ferus can produce primal cubs when bred to any stud. They are more likely to be plain primal rather than ferus though, since that's more common to inherit. Or they could also be smilus or felis. But the chance of any sort of primal cubs is quite low; I've seen players estimate roughly 5%, though staff haven't released actual numbers so nobody knows how accurate it is. I wouldn't be surprised if it was actually lower. But if the father is any primal variant as well as the mother being a ferus the chance is obviously doubled.

Other than that the only guaranteed way to get primals is to use the Mutie on Demand item to apply it. That is only for normal primal though; ferus etc are not applicable.

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