That sounds horrible. Funny that I'm a devout beef, chicken and pork eater but I really dislike animal cruelty like that. (I was born in the Chinese year of the Pig, too). Hmm..
It might vary country by country. The UK probably wouldn't allow it as I think the BBFC has laws against animal cruelty. Other countries I couldn't say, but it might be treated differently depending where you tried to screen it.
I hope the soul of that pig comes back as an ass-kicking ninja and whups its killers mercilessly.