1 and a half cm over the leanest part of the loin(chump) is a good average for most people.thats where you grade em.
I would love to rear my own pigs,chickens and a couple of sheep.not just for the meat but i'd just enjoy watching them grow natrually and if i don't get the meat yield or it works out more expensive,f**k it.i know it had a proper free range life.
I agree with animal rights when it comes to factory farming.