Hey the deer were there first, they aren't pests we are, correction we are a virus consuming this planet till we exhaust our resources and kill everything(if we don't blow it up first). Maybe we should practise mass sterilization on ourselves.

Another option is to provid them with enough food some where else to keep them full and away from you plants. We would throw out hay and oats to keep the deer away from our trees, which they seem to like more than grass especially new shoots and buds, so you may be shit outta luck.