Different breeds, different needs?

Huge improvements in lean meat production of pigs have been made over the last 30 years. For example, since 1972, backfat depths have nearly halved in 60-80 kg carcasses. And still, the quest goes on to produce a pig that has a “perfect genoytpe”, which can deal with environmental factors, diseases and most of all can deal with feed very efficiently! Different breeds of pigs may hypothetically have different nutritional needs. Although not so many different breeds are used for comm