Pasturage of pigs in woods; payment for that pasturage. (Bennett, Judith M. Women in the Medieval English Countryside, 234) Fee to allow pigs to feed on forest mast. (Gies, Frances and Joseph. Life in a Medieval Village, 245)
Food such as acorns that swine (pigs), etc., feed on in the woods. The right to let your swine feed in the woods. Often restricted to a certain number of days per year or to a set period. In the "New Forest" in Hampshire, "New Forest Commoners" still have this right. Each autumn their pigs eat the green acorns. This also protects the wild "New Forest" ponies from eating acorns and being poisoned.
Pannage is an English legal term for the practice of turning out domestic pigs in a wood or forest, in order that they may feed on such things as fallen acorns or beechmast. Today Pannage is observed in the New Forest national park of Southern England, where it is also known as "Common of Mast". It is still an important part of the forest ecology.