You need some cows! We rented a house on 3 acres in Indiana, and it came with an apple orchard. The owner told us that one day he looked out and a neighbor's cows were browsing the trees in his orchard!
We did have cows come through one night, though. They escaped from the dairy farm down the road, and just kept walking across folks' back yards. I had to call the farmer about midnight to come get them.
I'm surprised deer haven't found them. We have to keep the horses out for now, there's just too many.