Come-back for liquid fermented feed?

Feeding fermented liquid feed to pigs is not new, but I notice an increased interest in this type of feeding. Is this in line with (and a logical result of) the increased interest in intestinal health and reduction of antibiotics? Liquid feed is a great way to ferment protein-rich, home-grown fodder such as rape seed oil meal, peas and field beans or recycle liquid co-products from the human food industry into pig feed. Liquid feed for pigs basically comes into two varieties: Non-fer