Can't believe I'm chiming in on this one.
First of all, it is more likely that the monkey fucked the pig. A pig can not mount a monkey. It's is far more reasonable to suggest a monkey 'rear ended' the pig, simple logistics.
2nd, since when can sperm cross biological boundaries and inseminate another species? If that were true, there would be all kind of freakish animals out there.
but I could be wrong on that...
