Here in the UK, the abattoirs are geared for 50-75kg (about 6 months old) as there is a perceived view that above this weight there is too much fat on the pig, and fat is bad for you (if you listen to supermarkets), additionally when foot and mouth was prevalent many of the smaller, niche abattoirs decided to get out of pigs entirely. This leaves mainly large abattoirs which are geared to cope with the requirements for the supermarkets rather than specialists. The big issue is the de-hairing machine which can only take up to a certain weight of pig (although you can do this by hand). There are still a few specialist abattoirs which can cope with the larger beasties, just don’t expect to turn up to a large processor with a small hippo sized pig in the trailer and not be turned away!