Jim,
We have a 4 year old bottle fed puppy dog tame while growing antlers. The first two years we use him for breeding no problems. We always cut antlers because of the warnings we have heard from experienced farmers. The third year we put him in the pen with does for breeding he became a mad dog. He would ram the fence when you stood by it and we did not dare go in except in the 3720 JD tractor. He even rammed the loader bucket once the third year he was breeding. This year, year four, we had one guy walk around the outside and he would follow leaving time for me to get in the pen and feed with the four wheeler and a trailer. I felt it was safe to use the four wheeler for protection if I needed. I tried once alone on the four wheeler and he rammed the front wheel hard enough to have his head go under the front fender. I had to call for help. When we got the guy on the outside he went to him and he led him away. He continually had ears laid back and hair bristle, charging the fence and scraping the ground when we were near the fence. It may be his last year. His attitude changes quickly after we move him out of the breeding pen into the pen with the other big bucks. He has about a 10 to 20 minute violent scurmish with any of the other bucks that care to take him on then he turns back into a normal animal. We still treat all of our hard horn, cut antler, bucks as "dangerous" for safety sake, but they are easy to shoo off with a bit of noise. With this nasty one in the breeder pen I doubt he will change back while in the breeder pen. He has never been violent even in hard, cut horn stage until we put him in with the does. He produced a 225+ two year old for us so we are not quit ready to send him down the road yet.
Rod