Now this is totally hearsay as I cannot remember who told me or where I read it but somewhere along the line I heard that if the fawn is old enough, shooting the doe will cause the fawn to go into estrous in the late part of the rut and can be bred. If that is indeed true, then by shooting the doe you are adding two extra fawns to the herd and/or possibly getting a crack at a nice late rut buck. Reading it, it sounds a little unlikely but I did throw in a nice disclaimer to start the post
If your pass on the doe your still adding to the herd.