The breeding period is basically due to the photoperiod, rather than temperatures, that varies to a very small degree in each area from year to year. Generally though, the rut is later up in the northern and southern climates compared to the middle latitudes, which would make it seem like temperature has a little something to do with it. I think what we have mentioned is what happened in the case of that doe and it really isn't that unusual for a few does to not get bred, especially if it's in an area where possibly the buck to doe ratio isn't quite as good as it should be and a lot of does come into estrus in a very short time frame.