Breeding and Rutting Activity | Deer Hunting & Management

Deer Hunting Improves as Rutting Activity Increases

The white-tailed deer gun opener was slow in Central and North Central Texas. The second weekend was not much better. However, cooler temperatures and good reports of rutting bucks moving throughout much of the state should make this coming weekend a great time to head out deer hunting! Although much of the state’s abundant acorn crop is now depleted, deer still have a choice between cool season forbs and lush winter food plots (where they exists). Areas that were barren during the summer are now a hodge-podge of high-protein forbs.

Except for the last couple of months, 2009 has been a tough year for most of Texas’ white-tailed deer population. The preceding winter, spring, and summer were dry. Very dry. Extremely dry. But all of that has changed. Deer that were in poor to fair body condition during the summer have gorged on fat-rich acorns are now looking to be in good shape. Although many ranches are reporting that deer body weights are lower this year compared to previous years, rainfall received during September and October have “saved” the year.

Winter food plots, which are typically the most reliable plots, found themselves high and dry at this time last year. But not this fall. Anyone that stuck a seed in the ground is now the beneficiary of a lush food plot, regardless of what was planted. Recently, however, not all food plots were being hit hard. I suspect that many hunters that were reporting low food plot use by deer up until now should find that cooler temperatures will move more deer onto those plots, and earlier in the day.

More deer is a good thing, especially during the rut! I’ve received reports from throughout much of the state, except South Texas, of bucks following does for the past couple of weeks, but I’ve seen a marked increase in chasing activity over the past four to five days. Central Texas hunters heading to the field over the next week should expect to see good action. If you can find the does you will find the bucks, and deer should be hitting food sources well thanks to cool, brisk weather over much of the state.

As always, make sure to keep the deer population in check with available habitat. On average, the body condition of deer has increased greatly going into the fall thanks to a solid acorn crop and additional forage provided by much-needed precipitation. Antler quality has not improved; lower than average antler growth was a result of the tough winter, spring, and summer we experience through most of Texas. However, keeping proper deer numbers where you hunt is an important component of deer and habitat management.

Too many deer means less food per mouth, and if the rain turns off, next year could be particularly tough since we are still way behind on total rainfall. In short, don’t hesitate to harvest deer where needed. Get out and enjoy the cooler weather and put yourself in position to take advantage of increased white-tailed deer rutting activity. And remember, squeeze the trigger!

The Central Texas Whitetail Rut Is On!

Central Texas Whitetail Rut

Are bucks rutting in Central Texas? It is about that time, after all. As hunters prepare to head to the field this weekend for the opening of Texas’ general deer hunting season, white-tailed deer in the central part of the state have already begun their rutting activity. Cooler weather combined with the last week in October is a recipe to kick off the deer breeding season in the Hill Country and, yes, bucks are already chasing does!

As a matter of fact, I received a call from the northern part of the Hill Country last week that several white-tailed bucks were following does quite closely, just waiting for estrus to kick in. This information falls in line with some reports from Mills and San Saba Counties, too. The fresh, cold weather that has blown in recently has deer on the move and, hunters looking to take advantage of deer being up on their hooves. The rut is likely not “on,” but bucks are anticipating what is about to happen.

What Causes the Rut?

Photoperiod, day length, is the number one cue when it comes to rut, but weather can be a factor with regard to activity. In addition to decreasing photoperiod, the cold front that rolled through the Central Texas recently really put the deer on the move, so we know does are cycling into estrus. A number of biological and behavioral changes are dependent on photoperiod, but cooler weather always seems to put bucks on the move.

Research has shown that deer move more when the weather is colder, so this no doubt applies to the rut or breeding period, as well. And it makes complete sense that deer would move more during cooler weather because moving around builds up body heat. Too much heat leads to overheating and then it’s time to shut it down. Same for us.

Signs of the Rut

Over the last week, I’ve seen several white-tailed bucks that were road-killed — a sure sign that bucks are not thinking straight. Then Monday morning, I spotted two different bucks chasing does in Burnet County, in locations where I’ve rarely seen deer. Deer out of place and deer visible during the middle of the day are tell-tale signs the whitetail breeding season is upon us.

If you are planning on heading to the field, particularly Central Texas, this week to bag your buck be prepared to see some rutting activity and stay a little longer — because rutting deer can move any time of the day. A lot of good bucks have been harvested during mid-day. You can blow a grunt call, use a decoy, or whatever secret magic you have at your disposal, but the peak of the rut means deer will be moving. Period. But if you don’t bag your buck during the early rut this weekend, don’t worry. The rut peaks on the eastern part of the Hill Country around November 10 and the Central and Western parts near November 30.

Impact of Buck to Doe Ratios on Whitetail Fawning Dates

Past articles on this site have discussed buck to doe ratio more than once, but today we are going to talk about how buck to doe ratios impact subsequent fawning dates and recruitment of fawns into your white-tailed deer herd. Many factors can impact rutting or breeding activity, but most of the breeding takes place over a relatively short time in healthy deer herds.

Timing, of course, depends on latitude, local conditions, and a host of other factors, but year-in and year-out most of the rut takes place more or less over the same time each year in a given area. Though often overlooked, buck to doe ratio should be an important deer management consideration on your ranch.

Buck to doe ratio can impact fawning dates on your ranch

In the previous paragraph, a “healthy” deer herd was mentioned and it was stated “most” of the breeding takes place at the same time, but what exactly does that mean? Well, a healthy deer herd would be one that is at carrying capacity for the habitat, has a buck to doe ratio of no fewer than 1 buck per 3 does, and all animals are in good body condition. With all of these parameters in place, it would be expected that majority of the breeding would happen over the course of a 10-day period, or even less.

Ratios and the Rut

Why? Well as deer have evolved, the timing of deer breeding/rutting as become more constricted. A properly timed rut results in a high fawn survival rate and ultimately in the survival of the species. In some areas at northern latitudes, climate conditions can be extreme — so deer have adapted to a narrow fawning window.

If fawns are born too early, it can still be too cold. If too late, they may not have enough time to build up the needed body mass and energy needed to get through the winter. At southern latitudes, temperature is not as much of a factor, but it still plays a role for fawns born too early or too late.

Sex Ratios and Early Rut, Late Rut

So without getting into all the factors that can impact fawning dates right now, let’s talk about buck to doe ratios and how that effects the fawning season. White-tailed does come into estrus for only a day or two — usually in high numbers as if someone hit a switch. If they are not bred within that time, they will come back into estrus 28 days later. If there are not enough bucks to service all the does in an area, those does will not get bred until about a month later. If they aren’t bred then, it’s another 28 days. This explains what some people refer to as the “late rut.”

At this point you may be asking yourself, “What’s the problem?” Well, it’s true that deer populations with a high number of does per buck still have high breeding success (percent of does bred), but those deer herds don’t necessarily have good recruitment of fawns into the adult population. One reason can simply be because of habitat conditions.

Recommended Buck to Doe Ratio

If it turns out to be a dry spring, fawns that are born just one month later than expected may suffer some serious consequences, specifically regarding the available food sources for a doe to maintain herself, produce milk and raise fawns. If that timing ends up being 2 months later, then that may be well into the summer season and the odds of a doe raising those same fawns is much closer to zero.

In short, manage lands for a proper buck to doe ratio and it will help increase both breeding and fawning success. It’s recommended that there be no more than 3 does for every 1 buck, with the goal being 2 does per buck in most free-ranging deer herds. In the future, we will discuss some of the other factors that impact fawn survival and recruitment. Deer population parameters are closely intertwined, and the buck to doe ratio of your herd is much more than just a number.

Time to Hunt for Shed Deer Antlers

Hunting for shed antlers means getting out in the woods at a different time of the year. If you’re like most white-tailed deer hunters, then you spend the majority of your time in the woods during the fall and winter of each year. However, the habitat that white-tailed deer live in — just like the animals themselves — are found there year-round. Shed hunting is a good opportunity to get out and explore the area you hunt, learn more about it, and possibly even find some nice shed antlers.

With spring just around the corner and whitetail bucks beginning to shed last year’s antler growth, there is a good opportunity to learn more about your deer hunting area as well as the deer that live there. Hunters get excited when bucks start growing their antlers each year because it’s a chance to witness the affect of past management activities and offers a look ahead to, hopefully, future harvests. It really is something to get pumped up about.

Shed Hunting Season

Then, on the other hand, there are some hunters that also get pumped up after the hunting seasons have already ended. Those guys and gals are the shed hunters. Once winter sets in, it marks the fact that soon whitetail bucks will be dropping, casting their coveted antlers. As it turns out, there are ways to get a huge set of antlers on your wall other than shooting the big boy. He may have eluded you during the season, but you can still find his shed antlers!

Finding shed deer antlers not only ends with great rewards you get to take home, but also with some valuable information you can tuck away in your back pocket for next season. Information such as the quality of bucks that made it through the last hunting season, the number of different bucks that were in the area, and specific areas that these bucks used while in your area.

Shed antlers also allow you to physically track bucks that you may have been keeping a close eye on. Measurements that can be taken from year to year include common measurements such as beam length, tine length, and mass measurements.

Shed Hunting Tips

Look in and around late-season food plots and other food sources.
Examine deer travel corridors, water sources and anywhere deer commonly travel.
Use a game camera to monitor the deer herd and ensure most of the bucks in the area have already shed their antlers before your start. More antlers on the ground ups your chances at finding them.
Don’t wait too long to hunt for sheds. Rodents will eat and destroy cast antlers due to the coveted minerals they contain. In addition, warming weather will spur forb and grass growth and make finding antlers much more difficult.
Keep an eye out for new hunting locations. This may inspire you to cover more ground, increasing your chances of finding deer sheds.

Breeding in White-tailed Fawns

Can whitetail fawns breed? If you have ever witnessed a buck chasing after a doe fawn during the hunting season this question has likely crossed your mind. So, when exactly are white-tailed fawns old enough to participate in the rut, breed and start adding to the local deer population?

It turns out that white-tailed doe fawns are capable of breeding at 6 to 7 months of age and at approximately 70 pounds in weight , but this varies a bit depending upon latitude and individual body condition. In northern states, whitetail fawns may achieve adequate size, but because of their body’s need for energy for survival, reproductive development will be delayed. In addition, shorter days and cooler temperatures provide environmental cues that limit both sexual maturity and the breeding season in does.

In southern parts of the whitetail’s range, doe fawns can achieve puberty in early to mid-winter (January and early February) and be bred during that period. This is typically after the peak breeding season — the rut — after most adult does have been breed in an area. Of course, when big whitetail bucks are observed chasing does during the late winter, at a time when fawns have come into estrus, it’s often deemed a “late rut” by hunters.

The fact is that the rut for the area was right on time, same as usually, it’s just that doe fawns have finally come of age and size to have entered into estrus. As a result, doe fawns that have been bred will give birth to their fawns much later than adult does. Fawn survival of bred fawns is believed to be low because of a lack of fawn-rearing experience and because fawns are born during the middle of the Summer season, when food can be limiting.

Doe fawns with excellent nutritional levels have greater incidence of ovulation and puberty than fawns with inadequate levels of nutrition. With this in mind, in areas with very poor habitat, even yearling does (1.5-year old) can remain sexually immature! In one research study in the mid-west, approximately one-third of doe fawns examined were reproductively fertile in December.