We feed LOTS of beet pulp with the reindeer. Actually about 50 percent of their diet. Not sure about white tail, but with the reindeer, too much grain can be a bad thing, think acidosis here, so the beet pulp really balances it all out.
Can't say it compromised the antlers at all, think the reindeer do much better on it.
However, the comment was made earlier that adding beet pulp to your deer diet will throw off the nutrition label info (like percent protein) and that is very true. Beet pulp is very high in fiber, not protein , so be aware of that.
But back to reindeer, I would never go back to straight grain or pellet. We buy it separate and mix it in at the time of feeding. Used to have it mixed in the feed, but they were having a hard time balancing out all the ingredients with it at a 40 - 50 percent ratio.
Great feed for getting a healthy weight on them with out giving them too rich of a diet. Also can be increased in ratio to help with loose stool (not that it is a cure all to all kinds of stool issues) but can help when they are on too rich of a diet .
Comes in 40 lb bags (with or w/ o molasses) , and the price can vary between different crops and times of the year. Fluctuates between 11 - 14 bucks per bag in my area in WI.