Rye hay is a small grain hay. Small grain hay (oat, wheat, barley, rye) is very good hay - Put up correctly! Small grain hay is common in the west and can be successfully put up in good condition in their airid conditions. In the South, small grain hay is typically made into Haylage for cattle as it is extremely hard to get completly dry here and you have a tremendous amount of residual stem moisture. It is rare here in the south to get small grain hay put up correctly. Small grain hay put up correctly will usually have good sugar levels and good feed value. Always get a forage test if you want to actually know the value of your hay.