thats just the area we keep mowed bare for driving, the fenced area keep accidental escapes from happening, the feed bins are against the fence so they can be filled from the outside we get our feed in bulk 40 ton loads at a time. the extra pen in the back(left) and the alley lets us seperate deer into smaller groups or certian individuals making less animals to handle in the corrals if we don't need to.
For example : if I had 18 does in a pen and only wanted 6 of them for our AI program, The first group of 12 moved out of the pasture had only two of them. I would run them into one of small pens to the left of the facility, them move the rest from the pasture directly into the corrals and try to sort some of the first group back into the alley and back to their pasture reducing the number of deer to handle in close quarters, this really taskes unnecessary stress off the deer, although you can sort in the corrals , as always the less you have to handle the better