Here are the statitistics for last years hunts. These are conducted on high fenced properties owned by the state of Texas. Or WMA's. There are no supplement feeding programs that go on in these areas, only QDM.

The overall for all the hunts combined was a 43% success rate.

Heres a link, you can click a few different ones, some areas on some hunts such as gun hunts had a 100% success rate, but that aint saying much becausespikes and doescould count in there. I hunt on a 70 acre private low fenced ranch and could have a 300% succes rate if I shot everythig I saw.
Some of the youth hunts have higher success rate as baiting is allowed.
Notice the Chapparrell WMA (15,000 acres) on the archery hunt. 100 hunters- 5 days-3 kills.
Only the WMA's are high fenced. You'll notice the antelope hunt which is a free ranging hunt had a 100% success rate
http://www.tpwd.state.tx.us/huntwild/hunt/public/lands/statistics/2004/