To do this we needed our vet, Steve, to come in with his cheese wire. First of all we sedated Blitzen and when he was fast asleep set about cutting them off. Below are a couple of videos which show how we did it:
Once it was over he was left in his stable to recover. The keepers think he quite enjoyed this as he is lazy and it was an excuse for him to stay in bed most of the day! When he was fully awake we walked the girls back to him where Comet greeted him by rearing up as if to say 'now you can't hurt us!!'.
Blitzen is now taken for his walk daily with the girls and spends his day in the paddock. He still shows signs of wanting to stab us but at least we now know that he can't hurt us. The stumps that are left will drop off around Novemeber, when male's usually lose their antlers and next year they will still grow normally as this hasn't affected their growth.