Yup, and don't rule out elm and pine. They have no nutritional value but deer will eat them.

If you want a really good read, pick up a copy of "Heart and Blood" by Richard Nelson I believe. It's a really good look at the whitetail through the seasons both biologically and through the eyes of a hunter, nonhunter and antihunter. This guy really went to indepth links to write this book. You'll learn more than you thought you knew.

In it he mentioned a hard winter kill up in Michigan or Wisconson, I forget which but they found winter killed deer and their bellies were full of pine/elm needles. They felt full but still died of starvation.

Don't forget that the deer's metabolism really slows when conditions are the worst but what's hard on them is the continuous pressure hunting puts on them at this hard time of the year.