The Collaborative International Dictionary of English v.0.48:

Pasturage \Pas"tur*age\, n. [OF. pasturage, F. p[^a]turage. See
   Pasture.]
   1. Grazing ground; grass land used for pasturing; pasture.
      [1913 Webster]

   2. Grass growing for feed; grazing.
      [1913 Webster]

   3. The business of feeding or grazing cattle.
      [1913 Webster]

WordNet (r) 3.0 (2006):

pasturage
    n 1: succulent herbaceous vegetation of pasture land [syn:
         herbage, pasturage]
    2: bulky food like grass or hay for browsing or grazing horses
       or cattle [syn: eatage, forage, pasture, pasturage,
       grass]