According to Charlie Killmaster at the Rockmart meeting, there is no biological impact for extending the season. He stated that past date extensions (I.e. Eliminating the December break) did not really impact the overall harvest numbers. Though I heard it several times, a non-pregnant doe killed in October is exactly the same as a pregnant doe killed in January...both aren't giving birth so the impact on the numbers is the exact same.
But the Oct doe wasn't bred yet...