i think you mean rye grain as opposed to rye grass. it's very similar to winter wheat. you plant it in the fall, it looks like green grass over the winter, and in the spring/summer you'll have mature plants.

i planted rye last fall. saw plenty of hoof tracks in the plots, and saw plenty of evidence of grazing. the tops of the blades were usually flat, like they were bitten off.

it's pretty easy to plant too.