This is just my experience with my own bean fields. The deer will hit them heavy when the leaves are green. They are eating the leaves and not the beans. Once the leaves turn brown and drop, the deer quit using the beans for feeding although I will occasionally jump a bedded deer out of the field. After harvest, they will start using the field for feeding again. My theory is that the beans must need to dry down before they become attractive as a food source. I know there are some animals that will not eat raw soybeans (my chickens for example, ).