traditional pigs are and were a duel purpose animal to produce meat and fat for cooking and other uses that is how they have fallen out of favour in comparison to the commercially bred white pigs
no we do not underfeed them before slaughter
Hampshire's are just not a fat pig
once a pig gets fat starvation is the only way to get it lean or a squater of piglets to draw it down then fatten it back up (the best bacon is produced this way)
we have had experience of kunnies sadelbacks Tamworth's Hampshire and lops and crosses of them our opinion is just that our opinion based on the end product and the time to get them there this does not suit everybody