Well .... first cousins are allowed to wed in humans! None of the piglets born here have had any kind of deformity or even a mild fault like being a bit down on the pasterns. We've never had a runt in a litter and none have failed to thrive so, in my opinion, with the unrelated sire from a completely different bloodline thrown into the mix, the chances of problems are minimal. One can never be absolute certain, of course, but that's true of any mating.