Because whitetails are seasonal, short-day breeders, the timing of deer births is critically important for the species’ survival. Regardless of the environment, in the Northern hemisphere, whitetails are adapted to conceive at the proper time each autumn, so that fawns are born in spring (about 200 days later) when weather, food and cover conditions are favorable for maximum fawn survival.
It’s noteworthy that other, larger North American cervids, such as caribou, elk and moose, also exhibit this adaptive breeding/birthing schedule. Although they have an earlier breeding season and longer gestation (220 to 260 days), as compared to whitetails, they, too, typically give birth during late May and early June.
Given the importance of this breeding/birthing schedule, reliable environmental cues are required to trigger the reproductive process in a timely fashion.…
