Bullrushes (Typha) happen to be the most prolific root producing plant known. So much so that you can raise about 100 pigs per acre of Typha. There are devils in the details (how fast the typha regenerates, draining the land so the pigs can move around etc) but there is a vast food crop out there just waiting to be turned into bacon. The chances are, you could run pigs for the full 6 months it takes to raise them (spring floods, regeneration time etc) but you could run them for the last 3 months of summer and for the first three months, on raised beds full of potatoes, veges etc. You would also divide the typha crop into small areas that you intensely graze for a short time, just like with grass. That would give the Typha a decent regeneration time. Another idea I had was to start a mobile pigdozer business where you charge farmers to clear Typha for them. You come in first and dig a small drainage channel and once the ground is firm enough, you move in your piglets and set up an electric fence to keep them contained. The trailer they arrived in can act as a mobile home for them. This way, you don't even need land.