UVALDE – Researchers at the Texas AgriLife Research and Extension Center in Uvalde have developed a more accurate technique than traditional methods for estimating the age of white-tailed bucks, said a Texas AgriLife Research scientist at the center.
"South Texas is famous for producing trophy white-tailed deer," said Dr. Susan Cooper, AgriLife Research associate professor and lead investigator for the new age-estimation research. "Large-antlered deer sell for very high prices, so harvesting a good buck before it reaches its prime or after it begins to decline can represent a significant loss of income to the producer."
Cooper said when owners or managers know the true age of harvested deer on their ranch, it improves their ability to predict the age of live deer on that property.
"The traditional method for estimating the age of white-tailed deer has been by visual, tooth-wear patterns," Cooper said. "This method – known as the Severinghaus technique – was developed using northern deer and is inaccurate for estimating the age of wild deer in Texas beyond the rough categorizations of young, mature or old."
The new technique also relies on using the animal's teeth, but involves measuring the width of the dentine — the hard tissue located under the enamel of a tooth — on a specific tooth.
Cooper said over the past 10 years the wildlife team at the Uvalde center has ear-tagged more than 2,000 wild buck fawns on South Texas ranches. During the past decade, ranch owners and operators have kept tabs on ear-tagged deer, collaborating with the center on deer-related research.
"When these bucks are harvested, the partner ranch returns any known-age jawbones from tagged deer to us for evaluation and assessment," she said.
Cooper said research assistant Shane Sieckenius had noted that an actual measurement of tooth wear would be superior and more accurate than a basic visual scoring system would be in aging white-tailed deer.
After discussion and evaluation, the team determined the first permanent molar would be the tooth which was most likely to show age-related wear patterns. Using digital calipers, they took accurate measurements in millimeters of tooth height, as well as all ridges of white enamel and brown dentine on the tooth from jaw samples of harvested known-age bucks 2.5 to 7.5 years old.
"We wanted to see if we could go to just one location in the jaw to reduce the amount of variability of age-related wear within the jaw," Sieckenius said. "This particular tooth was consistent in showing the true indication of wear."
Cooper said evaluation of measurement data revealed that only the width of the dentine in the tooth's cusps, pointed ends of the chewing surface, was related to the age of the deer.
"The best measurement fit for aging was the width of the dentine, which we gave the value D, in the front cheek-side cusp of the first molar on the right side of the jawbone," she said. "This provided us with the relatively simple formula for estimating age: 1.8 times D, plus 1.8."
She said the only equipment needed for the study was the digital calipers, which can be purchased from major online retailers for as little as $20 each.
"To save doing the math, measurements can be compared to a simple chart that we have developed and will make available to landowners," she said.
"You have to get the jaws good and clean before measuring, so in our case we boiled the jaws thoroughly to ensure they were free from any tissue, decay or foreign objects that might hinder obtaining an accurate measurement," Sieckenius said.
Cooper said when tested on a sample jaws of 141 bucks, the formula predicted the correct age for 61 percent of young bucks aged 2.5 to 3.5 years; 53 percent of mature bucks aged 4.5 to 6.5 years, and 25 percent of old bucks aged 7.5 to 8.5 years. She added that all animals were correctly aged within one year of their actual known age.
For comparison, Cooper said, 27 wildlife professionals and students were asked to age samples of the same jaws using traditional visual tooth-wear measurements.
"They estimated the correct age for 40 percent of young bucks, but only 18 percent of mature bucks and none of the old bucks," she said. "This means the new technique – which we have named the AgriLife Dentine Method – of aging deer provides much greater precision in aging harvested deer."
Sieckenius said the new aging technique will be of particular interest to ranchers and hunting lease owners who wish to harvest deer at a specific age.
"This new measurement process is very interesting," said Jim Hillje, a wildlife consultant for many South Texas ranches and a former Texas Parks and Wildlife biologist. Recently, Sieckenius traveled to Encinal to demonstrate the new technique to Hillje and Jeff Pierce, manager of the 7-1 Ranch in Webb County.
"It's good to have a more precise way of aging a particular deer, and this new method works well in conjunction with the buck ear-tagging we've been doing for several years to confirm the deers' age."
Hillje said while he is satisfied that the new technique is an improvement in age-estimating methodology, the down side of current age-measurement techniques is the difficulty in applying them to live deer specimens.
"Landowners want to harvest deer at their maximum antler potential," Sieckenius said. "Some want to harvest them at five years old and some farther south may prefer to harvest when they're closer to six years old. We're giving them a means by which to maximize that potential so they can get the most for their hunt."
Dr. Susan Cooper | EurekAlert!
Engineers use electricity to clean up toxic water
08.07.2020 | University of Sydney
AI goes underground: root crop growth predicted with drone imagery
18.06.2020 | International Center for Tropical Agriculture (CIAT)
New insight into the spin behavior in an exotic state of matter puts us closer to next-generation spintronic devices
Aside from the deep understanding of the natural world that quantum physics theory offers, scientists worldwide are working tirelessly to bring forth a...
Kiel physics team observed extremely fast electronic changes in real time in a special material class
In physics, they are currently the subject of intensive research; in electronics, they could enable completely new functions. So-called topological materials...
Solar cells based on perovskite compounds could soon make electricity generation from sunlight even more efficient and cheaper. The laboratory efficiency of these perovskite solar cells already exceeds that of the well-known silicon solar cells. An international team led by Stefan Weber from the Max Planck Institute for Polymer Research (MPI-P) in Mainz has found microscopic structures in perovskite crystals that can guide the charge transport in the solar cell. Clever alignment of these "electron highways" could make perovskite solar cells even more powerful.
Solar cells convert sunlight into electricity. During this process, the electrons of the material inside the cell absorb the energy of the light....
Empa researchers have succeeded in applying aerogels to microelectronics: Aerogels based on cellulose nanofibers can effectively shield electromagnetic radiation over a wide frequency range – and they are unrivalled in terms of weight.
Electric motors and electronic devices generate electromagnetic fields that sometimes have to be shielded in order not to affect neighboring electronic...
A promising operating mode for the plasma of a future power plant has been developed at the ASDEX Upgrade fusion device at Max Planck Institute for Plasma...
07.07.2020 | Event News
02.07.2020 | Event News
19.05.2020 | Event News
09.07.2020 | Physics and Astronomy
09.07.2020 | Power and Electrical Engineering
09.07.2020 | Physics and Astronomy