Here is a link to the study. It is a good thing if you want to shot a bigger buck. If you only want meat why not just shot a doe?
http://www.tpwd.state.tx.us/huntwild/wild/game_management/deer/antler_restrictions/
Looks like prior to the change the percentage of bucks 3.5 or older was about 20%....After the change had a chance to take root...65% It all looks good from here.
-john