Tag: controlling urban deer

Antler Growth in White-tailed Deer

Testosterone levels control just about everything on a white-tailed buck, including antler growth and development. During this time of year, a buck’s testosterone level is quite low, but those levels will begin to increase as summer comes to an end and the fall season rolls around. Testosterone levels will peak just prior to the rut. It is during that time when bucks become very aggressive towards one another, establish breeding dominance, and prepare for the rut. That time of year can be rough on a whitetail buck.

When I received this photo of three white-tailed bucks in my inbox a couple weeks ago, the sender wrote that the deer on the left and the right (in the photo above) were bucks. I zoomed in for a closer look and noticed that not only two, but that in fact all three of the deer were bucks. And the photo makes sense because whitetail bucks have low testosterone during the spring and summer, and they can stand to be around one another.

This is the reason for spring and summer bachelor groups. Furthermore, does tend to be more solitary leading up to fawning season. Does will not associate with bucks, or other does for that matter, until several days to a couple of weeks after the fawns are born.

Whitetail Deer Management: Three whitetail bucks take a drink on the outskirts of Houston

There are other reasons, besides low testosterone, why bucks will not fight very much during the spring and summer. It is because their antlers are quite fragile. Growing antler material is basically is pre-formed cartilage, so trying to fight each other while in velvet would be like butting their noses together. It would not feel good and there would be a lot of blood shed.

Bucks, even with velvet-covered antlers, still have minor disagreements. They, however, settle these spats by standing on their hind legs and using their front legs to kick in the same manner that we often see does fight. Bucks fight only in this particular manner when in velvet during the antler growing period. During the remainder of the year bucks may fight in this manner but often choose head-to-head combat.

Whitetail bucks change drastically between spring-summer and the fall season. With rising testosterone levels, antlers complete their growth and bucks are spurred to shed velvet and rub on trees and shrubs. This rubbing activity and increase in testosterone creates noticeable changes in a buck’s body. During the spring and summer bucks have doe-like necks. With decreased hormones and no antlers up top — and no one willing to fight —their neck muscles shrink in size.

However, increased testosterone and antler rubbing soon condition a buck’s front-end and neck into a fighting machine, typical of what most hunters expect to see during the hunting season. This conditioning helps individual bucks compete for does and helps them submit does, as well. After all, during the rut hunters often see does running away from the bucks!

Whitetail bucks change drastically between the breeding season and the “off season.” These physical changes, in terms of their body and antler growth, are related to an individual buck’s testosterone level. Bucks have low levels of testosterone during the antler growing period and high levels of testosterone just before and during the breeding season.

These physical changes can make it difficult for most hunters to estimate the age of a deer on the hoof during the summer months, but whitetail bucks quickly “whip themselves into shape” for the big show as fall approaches.

The Control of Suburban Deer

Controlling Whitetail Populations

White-tailed deer populations in metropolitan areas of Texas are increasing significantly. The same thing is happening across the US. Deer populations have been increasing due to both conservation efforts and deer herd and habitat management, but in many areas a low mortality rates is the number one reason for rising population. To compound the issue,the human population of most cities in the United States is also rising.

In order to make room for the expanding human population, deer habitat is being destroyed as development of residential areas is increased. Each year these residential areas grow, spreading farther out into rural areas. Simply go for a drive in the “country” or rural, low-human population areas, on the edge of any metropolitan-urban setting and you will discover that the “country” getting further and further away!

Urban Deer Management: Whitetail Buck in Bulverde, Texas

The Adaptable Whitetail

The good news is that deer, especially whitetail, have a strong survival instinct as well as the ability to adapt to their changing environment. When their previously-forest or farmland habitat is cleared out and developed, they are pushed out temporarily. After homes are built-out and neighborhoods are completed, white-tailed deer will often return to live on the edges of these areas, in whatever suitable habitat they can find. Their previous food sources are replaced with new ones. Deer are also regularly fed by well-meaning humans.

Prior to the development of their habitat, deer would feed in the woods and fields and develop diets based on the natural foods found in their environment. After the development is complete, the whitetail will use new food sources including gardens, trees and other plants which have been planted in the new residential areas. Often, these deer stay out of sight, sleeping, eating and breeding until their population overtakes the “carrying capacity” of their new, reduced habitat.

Carrying Capacity in Suburban Areas

Carrying capacity is the quantity of animals that a given area can support, based on cover and food limitations. When the overall habitat available in an area is reduced, the carrying capacity of that area will also be reduced. It takes a very short time for an existing population of deer to exceed this carrying capacity within these new developments.

This causes problems due to the increased occurrence of deer-car accidents and other conflicts between the respective deer and human populations. These deer can become “nuisances” to the human population around them, due to limited space. That’s the time when the deer population control options start getting discussed. In these cases, cultural carrying capacity is more important than actual environmental carrying capacity.

Texas Deer Hunting Regulations: Bag Limits in Texas

Methods for Controlling Deer

There are several methods for controlling overabundant deer populations. Options which are considered, when deer population control becomes necessary are as follows: 1) Deer contraception, 2) Trapping and relocation of deer, 3) Removal of deer from the population by hiring sharp-shooters to shoot the deer, and 4) Removal of deer through bowhunting.

Contraception has never been shown to work in a free-ranging deer herd. It’s also expensive to try. Trapping and sharpshooting are also relatively expensive because the methods involve contractors for hire. In all the above situations, the costs of control is directly related to the amount of time ($/hour) someone has to spend carrying out the operation, plus the costs of supplies.

Trapping and relocation can be effective but is also high cost and very time consuming. Most metro city councils, parks departments and home owners associations have very small, if any, budgets for deer population control efforts. The use of sharp-shooters can be effective but, again, the cost will be high and the idea of high-powered firearms being used near residential areas is not popular with residents.

It has been shown through various studies that hunting is a cost-effective means for reducing suburban deer populations when compared with other tactics. In most cases, bowhunting is the method of choice for reducing the herd. The real cost savings come from not having to pay someone to remove or handle deer. Insteads hunting is merely allowed, promoted.

Birth Control in Deer

Deer contraception is conducted by trapping female deer (most of the time), sedating them and placing a contraceptive implant under their skin. These deer won’t become pregnant for a fixed amount of time until the implant becomes ineffective. This tactic has been proven to be high-cost and low effect because the majority of the female deer in an area need to be trapped and the cost of the drugs and the cost of trapping the deer are both high.

Others have tried to sterilize male deer through castration. Whether males or females have been treated, no contraception or sterilization project has succeeded in reducing a free-ranging deer population. Due to the survival instincts of the deer, it is difficult to trap a large enough portion of the deer population to make brith control an effective population control tactic.

Controlling Urban Deer Populations

Controlling Deer and Mitigating Risk

Managing deer numbers means having a goal and mitigating risk. The potential for accidents is not a risk that most city councils and parks departments, not to mention the local residents, are willing to take, regardless of the chosen control method. Again, bowhunting has been proven to be a safe and effective way for the deer population to be reduced. Also, the cost to the city councils and parks departments is minimal.

The deer which are harvested are either taken home by the hunters themselves or donated to local food banks, providing much needed, inexpensive protein for those in need. The hunters involved in these highly organized hunts are volunteers who donate their time. The opportunity to be in the woods is payment enough for them.

Organization of such take of deer (hunting) becomes increasingly important as non-traditional deer habitat increases and deer-population control measures become necessary. Management of deer herds involves removing some of the deer from areas where deer numbers exceed the overall carrying capacity. This reduction increases the health of the remaining deer population and reduce the occurrence of deer herd disease and winter-kill. Hunting is the safest and most economical way to reduce the overall deer population in a given area, but it must first be accepted and then implemented wisely.