If it's good pasture for the horses, it ought to attract the deer. What's around the farm? Any crops? My father in laws farm was sown in pasture for cows and all around it was set aside ground. That means fescue, which is good for nothing except holding the earth together. Deer fed in his fields all the time. If you have crops around, you'll have a hard time with food plots.
We cannot continue to do the same things and expect different results