RE: Rut theory question?
The cold weather increases the testosterone in bucks, but it does not make the does want to breed or go into estrous.
The amount of daylight is what causes the rut to kick in.
Does go into heat or estrous for only 24-48 hours each, and when they go into estrous can't be predicted precisely.
We see bucks chasing does because one or more does has come into heat and the bucks know that the rest of the does will come into estrous at any time.