The Cull Buck That Never Was
Every fall, somewhere in a deer camp, someone points at a spike on a trail camera and says that buck has to go. The logic sounds airtight. Small antlers come from poor genes, poor genes get passed to fawns, and if you pull the runts out of the herd, the herd gets better. Hunters have repeated that chain of reasoning for decades, and landowners have paid consultants to put it into practice. A growing pile of research says the chain breaks at almost every link, at least in a free-ranging herd.
The latest push came from Outdoor Life, which reported that hunters cannot meaningfully reshape the genetics of wild whitetails. Kip Adams, chief conservation officer of the National Deer Association, formerly the QDMA, put the misconception plainly: "Many hunters simply believe that you can influence antler quality through genetics in the wild." His answer was just as blunt: "In the wild, it's very clear we cannot do that." That is a strong claim from the man whose organization has spent decades preaching deer management, so it is worth looking at what the science actually shows.
What Texas Learned the Hard Way
Most of the evidence comes from South Texas, where researchers at the Caesar Kleberg Wildlife Research Institute at Texas A&M University-Kingsville spent years putting the culling theory to a real test. The idea had a respectable origin. A study of penned deer, run by Texas Parks and Wildlife roughly 25 years ago, suggested that selective removal could raise average antler size. Managers took that result and ran with it, and for years culling small-antlered bucks was standard advice in parts of the state.
The follow-up was larger and far more demanding. It was published in Wildlife Monographs in 2026 under the title "Effects of selective harvest on antler size of white-tailed deer in Texas," and it drew on two ranches. On the King Ranch, a low-fenced property where deer could wander in and out, managers culled males with below-average antlers for their age class from 1999 to 2005 and compared the results with control areas. Deer were captured each year, antlers were measured, and tissue samples tracked paternity. The result was no detectable effect from the culling.
Comanche Ranch: A Closed Experiment
The Comanche Ranch work ran from 2006 to 2018 on high-fenced ground, which meant a closed population and about as clean a test as field biology allows. One area saw culling of older small-antlered bucks, and an intensive area saw the removal of small-antlered bucks of all ages. Researchers used helicopters with net guns to capture deer, and about 6,000 captures were made over the project, roughly half of them recaptures. Culling ran until 2012 and cut the male population in the intensive area by 88 percent.
Antler size in bucks 3.5 and older did go up after seven years of culling, which is exactly what a proponent of culling would have hoped to see. The catch is what happened next. Once culling stopped, average antler size in later years was either smaller than or unchanged from where it started. Charles DeYoung, professor emeritus at the institute, summed it up: "There was no evidence of genetic improvement from the fact that we increased the larger antler size." He added a second line that is hard to argue with: "Culling didn't change the size of the antlers in the treatment area compared to the control area."
David Hewitt, the institute's executive director of wildlife research and a coauthor, was equally direct about the scope of the effort: "I really think it's definitive."
Why a Buck's Rack Tells You So Little
If antler size were a simple inherited trait, culling should work. It doesn't, and the reasons are layered.
Rainfall Beats Genes
Antlers are expensive to grow. They are bone, built in a matter of months, and they depend on protein, minerals and a body that isn't starved. Donnie Draeger, manager of the Comanche Ranch, saw average antler size swing by 10 to 15 inches across all three study sites in years with good rainfall. That swing hit the control pasture as hard as the culled ones, which is the clearest sign that the weather and the forage it produced, not the removal of small bucks, were driving the numbers.
Heritability Is Real but Modest
None of this means antlers are unrelated to genetics. A study on Faith Ranch, led by master's student Cole Anderson under Randy DeYoung, followed two 1,100-acre high-fenced pastures for about 15 years. It built a family tree of 521 unique bucks and 2,638 antler measurements and estimated that roughly 35 percent of gross antler score is genetic, with about 65 percent environmental. The trait breakdown is telling: tine length at 49 percent, antler mass at 28 percent, total points at 19 percent, beam length at 13 percent, and inside spread at zero. Points, the number hunters obsess over, carry among the weakest inheritance.
Even the breeding-control pasture, where large bucks were paired with does in small pens, produced only a modest edge. The average 5.5-year-old buck there measured 152 inches gross, against 145 inches in the neighboring pasture without breeding control, a gap of about 7 inches after 15 years. Anderson's own conclusion was that "Improved nutrition in East Yana alone accomplished more for antler growth than intensive breeding control in West Yana." Behind a fence, with total control of who breeds whom, genetics can nudge the needle. In the open woods, nobody has that control.
The Does Matter as Much as the Bucks
One piece of this is almost always forgotten in the cull-buck debate. Does contribute half of a fawn's antler genetics, and no hunter can look at a doe and see what she carries. Pulling spikes off the landscape addresses only the sire side of the equation, and only one fraction of the sires at that.
Most Bucks Don't Sire Much
According to Adams, "Research shows that most bucks sire very few fawns during the course of their life." The Outdoor Life piece also notes that average fawn recruitment across the country runs about 0.59 fawns per doe. With numbers like that, a single dominant buck is not the one steering the gene pool, and shooting one small-racked deer barely moves it.
The Trophy-Turnover Problem
The Comanche Ranch data also showed why culling feels like it works. Draeger observed that "30 percent of your trophies will turn into culls in almost any given year in any age class." In other words, bucks bounce around. The great five-year-old this year may be a mediocre one next year, and a spike as a yearling can grow into a respectable buck. And when a manager removes the worst performers from a cohort, the standing crop looks better. Draeger called that "a sculpted cohort," one that "increases the standing crop quality and gives the illusion of genetic improvement." The deer on the hoof really are better on average that year. The next generation isn't.
He was just as skeptical about reading the sire from the rack: "You cannot tell how a buck's offspring is going to look, good or bad, by looking at the sire's antlers." His example was a 190-inch sire whose offspring generally scored well below him.
The Levers That Actually Move
If culling is mostly a dead end, where does a hunter spend time and money? The same people who busted the genetics myth have a fairly consistent list.
Let Bucks Get Older
Age is the cheapest tool there is. The National Deer Association's 2021 Deer Report found that 39 percent of antlered bucks harvested nationwide in the 2019 to 2020 season were at least 3.5 years old, the highest national average recorded. Adams credits hunters for letting deer live longer. Management-oriented sources often argue that a 3- or 4-year-old buck has only expressed 60 to 80 percent of his antler potential, which is why Illinois hunter Justin Cearlock says he has "no intention of shooting a deer younger than five, unless it has just a substantially huge rack." His brother Brent put the logic in simple terms: "if you shoot them, they're definitely not going to make it to five."
Passing bucks takes discipline, and it can burn you. Brent Cearlock passed a 4-year-old in the mid-160s that later fell to a neighbor's tag. Age limits work best when the neighbors share them, or at least when you accept that some of the deer you spare will go to somebody else.
Feed the Herd Better
Nutrition is where the research keeps landing. The Comanche Ranch results tied protein supplementation to mature bucks scoring roughly 15 inches larger. At Faith Ranch, bucks in unfed pastures averaged in the mid-120s, well below the supplementally fed groups. Anderson's advice was short: "Let deer grow older, and give them food before you worry about genetics."
For a hunter without a feed program, that translates into habitat work. Rick Dahl, a Missouri hunter and NDA board chairman, bought a property that was previously cattle pasture and found fertile soil but a limited food supply, a mature canopy that choked out the understory. His early trail-camera survey showed yearling bucks mostly as spikes and almost nothing above eight points, with four older bucks probably scoring about 140 inches. The fix is not a new buck. It is sunlight on the forest floor.
Shoot More Does
Food is the limit on antlers, and food gets divided by the number of mouths. Reducing deer density through doe harvest improves nutrition for the animals that remain. Neil Dougherty, president of the consulting firm NorthCountry Whitetails, evaluates properties on 17 factors and argues that the balance between food and deer is the key one. He notes that some big-woods country may support only around eight deer per square mile.
Hunt Smarter
Dougherty also estimates that poor wind awareness causes roughly 40 percent of hunting failures on new properties, and he says access and exit routes are often the hardest part of the job, since leaving a stand without alerting deer takes real discipline. Unlike genetics, those are things a hunter fully controls.
Where the Experts Still Disagree
It would be too neat to say the debate is over. QDMA Canada has argued that culling bucks with inferior antler quality can change the average antler quality of a well-managed herd. Penn State's deer program has pointed out that half the genetics of every male fawn come from the mother, which earlier research largely ignored. And behind a high fence, where breeders choose pairings, genetic progress is real, as the Faith Ranch results show. Randy DeYoung said on the Deer University podcast that he does not believe deer genetics can be managed outside a high fence.
So the fair reading is narrower than the headline. For a wild, free-ranging herd, the practical evidence says selective harvest does not produce lasting genetic gains, and the effort is better spent elsewhere. Depending on the source, the figures reported for the Comanche Ranch study differ somewhat, including the number of bucks culled, which is a sign that the details are complicated even if the conclusion is consistent.
What This Means in the Truck and the Stand
For the man who hunts public land or a lease with a handful of neighbors, the takeaway frees up a lot of mental energy. You are not responsible for fixing your county's gene pool. You are responsible for the stuff that does show up on the scale: letting young bucks walk, helping the habitat produce more groceries, keeping deer density in line with what the land can carry, and hunting with enough care that you actually see the deer you came for.
Natalie Krebs, who wrote the Outdoor Life piece, describes her own family property improving over roughly 30 years through habitat work and discipline, not through any change to the bloodlines. That is a slower timeline than the quick fix that culling promised, and it has a lot less romance than a camp argument about bad genes. It also has the advantage of working. As Dougherty put it: "I would encourage people to not get caught up in this whole genetic thing."
