It's all related to The deers rising testosterone level.
When his testosterone level rises, his whole attitude changes making him do things he wouldn't do normaly. These things he is doing now you may know better as "rut activity".
While engaged in rut activity, he is actually "working out", rubbing, scraping, sparring, and at times full blown battles.
Combined with a good nutritional food source, he will transform himself into a prize fighter, For his weight class.
My two cents.
Follow your dreams, especially if your dreams are leaving tracks in a fresh 6 in. snowfall!