As have been stated yes they will eat hay, however they prefere the brouse, and when seen eating on a bale of hay they are usually picking out the weed plants that are contained in the bale, I have several acres of bermuda hay and it is some of the best hay for cattle and horses, I have never seen a deer eating on that hay, but have some pastures that are just plain old grass pastures, thats where you will find the deer, a trick of some of the cattlemen here was to run a few goats with their cattle to improve their pastures, the cattle eat the grasses and the goats eat the WEED plants. JIM