Mike, Nothing is set in stone, It may be an isolated incident, maybe a young doe comming into her first heat late. Here in northern Mich it is not uncommon to see unbred Doe's cycle 3 times in areas were the Doe to Buck ratio is high (just not enough Bucks to go around) each cycle is just shy of a month(28 days) apart, some say 21 days. The farther south you go seems like the later these cycles occur. I heve taken several nice bucks in Kentucky with doe's during Christmas week. Good luck on the Buck.