Deer will eat naturally occurring native wild grasses when their normal forage foods aren't available. Also, some crops such as naked oats appear to be grasses when consumed by deer. Naked oats (or Johnson oats) put most growth into the stalk and very little into a seed head, thus giving them the appearance of a grass, very similar to what is found with Rye grass and early season wheat or triticale. Since Rye grass is often seeded along the sides of roads and highways, that is the reason deer are often seen at night feeding along the side of the roads. They aren't grazing on the actual roadside grass that is so often planted to help prevent erosion as much as they are grazing on the Rye grass that is planted to keep the sides of the roads green.
I plant naked oats along with Austrian Winter Peas in my fall and winter food plots, and have noticed that it often appears as grass once it's been consumed by the deer.
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