Good ideas. To maximize the use of available acreage divide it up into four or more paddocks to implement an easy managed rotational grazing. Even a quarter acre (100' x 100' or 30m x 30m) is big enough to divide into ten paddocks to support two to four pigs. I figure ten pigs per acre and any external supplements can increase that. This will get very good return on feed from the land. This maximizes the growth potential of the forages, breaks parasite life cycles and minimizes soil compaction resulting in gradual improvement of the pasture.