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2nd., You should NEVER give your deer herd selenium!! Selenium is important to cows, but can be toxic to deer, sheep and similar ruminants. Pike
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All deer are is small cows. All ruminants will get white muscle disease with a lack of selenium (among other things especially interfering with Vit E absorbtion for added imunity benifit. Cows and all ruminants including deer benifit from selium vit E especially before giving birth and shortly after. Selenium is toxic to cows at high levels too.

A cow or a deer can lick a mineral block all day long and still not consume enough of the macro minerals, salt, and even some of the micro minerals and vitamins needed for proper development.
I am not an antler know it all, but I think they are mostly made up of phosporous, calcium, and magnesium, the mag being the mineral lacking in most posts here. Give them some loose mag-ox, dical, a decent trace mineral vitamin pack, and salt and your in business.
Most of the trace minerals in trace mineral salt are supplied in negligable amounts to do much good. PM me if you would like to know more about minerals