Deer reproduce sexually and there is internal fertilization. [ The gestation period for a whitetail is 200 days. Click on the ecological region of interest to see the Breeding Dates for White-tailed Deer table. It’s the best time of year for a white-tailed deer hunter, too. A deer's gestation period is 200 to 205 days, most of the fawns being born in the latter part of May or the first part of June. Randy published a gestation chart for whitetails 190 days, 196 days, 200 days, and 205 days for those who got the Spring '09 Deer Tracking Magazine Dec 29th 2009, 10:31 AM # 5 A doe's estrous period usually starts in November, which initiates the bucks' interest. After that, she will give birth to either two or three fawns. Any receptive doe that does not become pregnant will cycle back into estrous (heat) in about 28 days and will mate again. Predators and the harsh elements of nature play a role in this. Reproduction Breeding season begins in November and is called the rut season. A whitetail doe will only have one fawn the first time she breeds, especially if breeding as a 7- to 8-month-old fawn. White-tailed deer are polygamous and a big buck will mate with many doe, but the doe will only court one buck, occasionally a doe will have more than one mate. If a doe is not mated, a second estrus occurs approximately 28 days later (Desert USA). Gestation times vary between species but the deer gestation period is, on average, about 10 months. Because of the differences in weather patterns and seasons, researchers need to know whether gestation lengths of northern deer are similar enough to those of southern deer to avoid breeding problems. Sometimes females are males will travel separately in their own herds. To estimate peak rutting for white-tailed deer populations, biologists sample gravid does during late winter and spring to examine fetuses. Yearling does usually give birth to single fawns. Some of it is handy knowledge for the month of November (and other times for you southerners). Here are 15 interesting facts you might not know about whitetail deer. In the southern parts of their ranges, whitetail deer will not mate until January or February. Whitetail Deer. A doe will be in heat for about 30 hours and if there is no conception or copulation the doe will begin her heat cycle in 28 to 30 days. Because white-tailed deer are polygamous, one dominant buck can breed numerous does. Fawns (baby deer) are born during May and June after a gestation period of about 200 days. White Tailed Deer (Odocoileus virginianus) is the most vigorous and well-distributed wild ungulate in North America. Here are 10 interesting facts about the rut. It is possible for “twin” or “triplet” whitetail fawns born from the same doe to be sired by different bucks. Deer need 10 to 12 pounds of food per day to satisfy their needs. The rut isn’t just the best time of year for a white-tailed deer. The majority (90%) of the fawns are born by July 19 in the eastern area and by July 25 in the western area. The pregnancy rate was 95 percent and there were 1.5 fetuses for each sampled doe. The first fawns will be born in the later portion of spring after a gestation period of around 200 days. 20. Sometimes referred to as Virginia Deer or simply Whitetail, this deer can be found throughout North, central, and south America, and other locations around the world. During this period the female will not be receptive to mating with the dominant male. Breeding Chart. The opposite of dogs, whitetail deer only wag their tails when they’re startled. A deer's gestation period is 200 to 205 days, most of the fawns being born in the latter part of May or the first part of June. The female deer will stay with their young [fawn] for a gestation period … In the wild, their life span is about 4 or 5 years old. 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