A 90 kg liveweight pig should give you 90 x 0.72 = 65 kg deadweight pig. This would have no "organs", other than the kidney (approx 100 g), as the pluck is not included in this weight, and all the guts have been taken out by the time you get to the dead weight. The head, trotters and tail weigh between 5 -6 kg so you are now left with 59 kg. By the time the rest of the carcase is butchered, with some of the joints boned out and flare fat removed, you could easily be down to 51 or 52 kgs. We do all our own butchery and usually get another 5 - 6 kgs of waste per pig in addition to the head/trotter waste. I always weigh all our meat, mince and waste so I can add it all back together again at the end to see how close we are to the official deadweight, usually within 500 g. Tamsaddle