Rut (according to Webster) - 1. A cyclically recurring condition of sexual excitement and reproductive activity in male mammals, as deer.
2. A periodic condition of mammalian sexual activity: Estrus.

So, if does, and I don't agree that they have to be young, just simply not pregnant, come into estrus, you have a rut. I think doe follow a 28-day cycle, so you've probably missed it. Probably went by first/second week of Dec.

Hope this helps, and good luck hunting,
KP