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]

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "pasturage":
   barley, bird seed, bran, campo, cat food, chicken feed, chop, corn,
   dog food, eatage, ensilage, feed, fodder, forage, grain, grass,
   grass veld, grassland, grazing, haugh, haughland, hay, lea, llano,
   mash, mead, meadow, meadow land, meal, oats, pampa, pampas, park,
   pasture, pasture land, pet food, prairie, provender, range,
   savanna, scratch, scratch feed, silage, slops, steppe, steppeland,
   straw, swale, swill, vega, veld, wheat