Below are some useful links to articles by Texas Parks & Wildlife for managing whitetail deer:
Favorite Forage Plants of Whitetail Deer
http://www.tpwd.state.tx.us/publications/pwdpubs/media/pwd_br_w7000_1222.pdf
A Guide for Aging Whitetails
http://www.tpwd.state.tx.us/publications/pwdpubs/media/pwd_bk_w7000_0755.pdf