True, but knowing what "normal" looks like isn't terribly helpful when what you are looking at isn't normal for some reason. In the case of a badly split buck or one of those "just what do you call that??" does (and I have seen quite a few of both, in the 30+ years that I have been breeding rabbits), the presence or absence of testicles pretty much clinches the matter. Testicles don't magically appear at 6 months of age. An 8 week old might or might not have visible testicles, but by 13 weeks, there definitely should be something there. My point is that there are other clues that one can look for, in those annoyingly common situations where the genitalia doesn't look exactly like the pictures.
That would depend on just how bad the split is. If it's just at the tip, there is nothing to impede the buck's performance, so his usefulness as a buck is unaffected. If the split goes the full length and all the way down to the urethra, the buck might go through all the motions, but the sperm never makes it into the doe, so though the buck may be fertile, he's not going to sire offspring (unless you want to try AI, I suppose). Some bucks don't have an all-the-way-in split, more like a groove, and those are tricky both to spot and to breed. A lot of the time, a penis with a groove tends to curve and curl rather than stand up straight, so whether the buck can get the job done or not is uncertain, and he may be capable some times and not at others.
