The Truth About Spike Bucks
Wooooo doggieee, welcome back to Texas Fish and Game Unfiltered with Kevin Burke.
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It's opening morning. You climb up in your blind before first light, pour some coffee, sit back, and wait. Sun starts coming up. Brush starts coming alive. Two bucks step out into the sendero.
One of them's a spike.
Now the debate starts. Your buddy in the next blind over says shoot it — it's a cull, pull the trigger and don't look back. Your lease manager agrees — been saying it for twenty years. But then there's that one guy at deer camp, always got an article printed out, saying that spike might just be a nutrition deer. Late-born fawn. Let him walk and he'll turn into something.
And now the Caesar Kleberg Wildlife Research Institute at Texas A&M Kingsville just published a study asking point blank: is it time to end the war on spikes altogether?
Who's right? The answer depends on where you're hunting and what you're trying to accomplish. By the end of this episode, you're going to know more about spike management than 90% of the hunters in Texas. Let's get into it.
What Even Is a Spike?
Before we go any further, let's make sure we're all talking about the same animal — because this is where a lot of people get confused.
A spike buck is a yearling deer — 1½ years old at the time of hunting season — that has two fully hardened antlers with no branches, no forks, nothing. Just two straight tines coming up off the head. That's a spike.
We're not talking about nubbin bucks. We're not talking about button bucks — those little fawns with skin-covered bumps on their heads. A true spike is a fully developed yearling with hardened, unbranched antlers. That distinction matters a lot when we start talking about genetics and management.
At the time of the hunting season opener, that yearling has been alive about 18 months. He's had one full growing season to produce his first real set of antlers. What he puts on his head that first year tells you something — and the debate is exactly how much.
Thirty Years of "Shoot Spikes" — The Traditional Science
For most of the last three decades, the standard advice from TPWD biologists has been consistent: if you want to improve antler quality in your herd, harvest spikes.
That guidance came out of the Kerr Wildlife Management Area in Hunt, Texas — the most intensive penned whitetail research program ever conducted. TPWD biologists Bill Armstrong, Donnie Harmel, Butch Young, and others spent years studying antler development, genetics, and heritability. Over 20 generations of deer. More than 1,600 pedigreed animals with detailed records. The largest pedigreed whitetail herd in the world.
Here's what the Kerr data told us.
First — antler development is genetically based. Not every deer has the same potential. If you put a buck on a solid 16% protein diet with adequate calcium and phosphorus and he's still throwing spikes, that's a genetic signal. Good nutrition can't overcome bad genes.
Second — yearling spikes, on average, will produce smaller antlers in every year that follows compared to fork-antlered yearlings raised on the same range. And it wasn't a small difference. The fork-antlered group was consistently equal or better at 3½ years than the spike group was at 4½ years. Let that sink in — you could let your spike walk four full years and he still might not catch up to what a fork buck was putting on his head a year earlier.
Third — antler traits are highly heritable. Texas A&M geneticists calculated the numbers. Antler mass came in at 0.70 on a scale of 0 to 1. Main beam length at 0.54. Number of points at 0.46. Anything above 0.30 is considered practically significant for management. These numbers are comparable to cattle and other livestock. You can actually select for this stuff.
Fourth — does carry 50% of the genetic load for antler potential. You can't look at a doe and know what she's packing genetically. But by controlling which bucks breed — protecting your fork bucks, removing spikes — you improve the gene pool over time.
The TPWD recommendation was blunt: if two spikes walk out in a two-buck county, shoot the smallest one first and don't let the second one get away.
And beyond genetics, this strategy had another benefit that doesn't get talked about enough — it shifts hunting pressure. If your hunters are tagging spikes, they're not burning tags on your 2½ and 3½ year old fork bucks. Age structure improves. You start seeing more mature deer. The whole operation gets better.
But What About Nutrition?
Here's where deer camp gets loud.
I'm not going to tell you nutrition doesn't matter — it absolutely does. TPWD was always clear on that. Habitat management comes first. Deer density in balance with carrying capacity. That's the foundation everything else is built on.
On overpopulated, overgrazed, drought-hammered ground, you are going to see more spikes. Not because every deer has bad genes, but because those animals don't have the resources to express whatever genetic potential they do have. Body maintenance comes first. Bone and antler growth is last on the list when food is short.
But here's what the nutrition argument misses: even on the worst-managed ranges in Texas — the most abused, overpopulated, nutritionally depleted ground you can find — you will still see fork-antlered yearlings. Some bucks have enough genetic foundation to produce forks no matter what. Those are the animals you want doing the breeding. The spikes on that same ground, eating the same food, born at the same time, are still telling you something.
And the late-born fawn argument? TPWD addressed this directly. South Texas — where the biggest bucks in the entire state are consistently produced — has an average fawning date of July. That's a full month later than Hill Country deer. Late birth does not determine antler quality when nutrition is adequate.
The right frame here isn't genetics versus nutrition. It's genetics AND nutrition AND age — all three. TPWD put it this way: asking which one matters most is like asking whether your truck needs a transmission, an electrical system, or a fuel system. Take any one out and you're not going anywhere.
The New Research — The War on Spikes May Be Over
Now here's where this episode gets really interesting.
In October 2025, the Caesar Kleberg Wildlife Research Institute published results from the Comanche Ranch Buck Culling Study. Dr. Randy DeYoung led the research. The title asks the question right out in the open: "Is It Time to End the War on Spikes?"
This study is different from everything that came before it.
The Kerr WMA research — as solid as it was — was conducted on penned deer. Controlled environment. Controlled breeding. Researchers knew who bred who. In a pen, you have real control over genetics. In the wild? Completely different story.
The Comanche Ranch study was the first large-scale attempt to measure heritability of antler traits in free-ranging wild deer. They captured 3,332 individual bucks over the course of the study and used DNA-based genetic parentage analysis to assign sires to over 1,200 yearling bucks. This is cutting-edge science.
What did they find?
Heritability for yearling antler traits was low. Less than 14% of the differences in antler size among yearling bucks was explained by genetics inherited from their sires. Environmental conditions in early life — nutrition, rainfall, habitat quality during those first few months of a deer's life — had a much greater influence on what a yearling put on his head than genetics did.
It gets more nuanced from there. Antler size in bucks 3½ years and older was a better predictor of genetic quality. At maturity, genetics accounted for about 25% of differences in antler points and 39% of gross Boone and Crockett score. That's meaningful. But even at maturity, up to 30% of the differences in antler points were tied to early life environmental conditions that carried forward.
Here's the number that really tells the story: spike-antlered yearlings at Comanche Ranch averaged about 10 inches B&C smaller at maturity than fork-antlered yearlings. That sounds like the same old story — spikes are still worse on average. But look at the overlap. Fourteen percent of spikes exceeded 150 B&C at maturity. Fifteen percent of forks came in under 130. There's a lot of gray area in the middle.
The practical conclusion from DeYoung: culling yearling spikes is unlikely to produce meaningful genetic change in a wild deer population. Why? Because in the wild, bucks disperse miles from where they were born. They compete for breeding opportunities. Even the biggest bucks only sire a handful of fawns each season. You just don't have the breeding control that made penned studies work. You can kill every spike on your property and the buck two properties over — who's never been managed a day in his life — is still breeding your does.
This doesn't mean spikes are great breeders. It means the idea that we can genetically improve a wild free-ranging herd by targeting yearling antler traits may have been overstated. The war on spikes — at least as a genetic improvement strategy — may not be delivering what we thought outside of a high fence.
So What Do You Actually Do?
Alright. You've got 30 years of TPWD science saying shoot spikes. You've got brand new Caesar Kleberg research saying the genetic payoff may not be what we thought. What does a Texas hunter or land manager actually do with all of this?
I'm going to give it to you straight.
If you're running a high fence operation with intensive management — the traditional spike harvest strategy still holds up. You have actual breeding control. You know roughly who's breeding who. You can move the genetic needle over time. Keep harvesting spikes, document everything, work with a biologist, and manage your habitat hard. The Kerr research applies to you.
If you're on a low fence lease or a typical Texas hunting property — the Comanche Ranch data says you may not be getting the genetic improvement you thought you were. But that doesn't mean you should stop harvesting spikes. Here's why it still makes sense.
One — it shifts hunting pressure off your better bucks. When your hunters are tagging spikes, your 2½ and 3½ year old fork bucks are surviving another season. Age structure improves. And age is the single biggest factor in antler quality that you can actually control on a low fence property. A 4½ year old buck with average genetics will almost always beat a 2½ year old buck with great genetics. Let bucks age.
Two — a spike is still a signal. On a well-managed, nutritionally sound property, a yearling spike is still the bottom of the class. Even if you can't breed your way to improvement as efficiently as penned studies suggested, you're not giving anything up by harvesting them.
Three — and I want to say this loud and clear: if you are seeing 40, 50, 60% spikes in your yearling buck population, that is not primarily a genetics problem. That is a habitat and density problem. Your land is overpopulated relative to what it can feed. Fix the habitat first. Manage your doe harvest. Get your deer numbers in balance with carrying capacity. Then worry about spikes. If you try to genetic-select your way out of a nutrition problem, you will spin your wheels for twenty years.
Four — don't let perfect be the enemy of good. Whether culling spikes moves the genetic needle as fast as the old research suggested or not, it still does no harm. It shifts hunting pressure. It removes the bottom of the class. Keep doing it. Just don't sacrifice a mature buck to shoot another spike.
The three pillars of deer management haven't changed: nutrition, age, and genetics. Manage the habitat so every deer can reach its potential. Let bucks age enough to show you what they've got. And yes — when given the choice, remove the bottom of the class.
Wrapping It Up
I love that the science is still evolving on this. That's a good thing. It means we're asking better questions and getting better answers. Thirty years of Kerr research built the foundation. The Comanche Ranch study just challenged us to apply that foundation more honestly in the real world.
The bottom line: spike management still has a place in your program. Just understand what it can and can't do — especially on open range. Focus on habitat first, age structure second, and let the genetics work itself out over time.
Let 'em age, manage your numbers, and pray for rain.
I want to hear from you — what's your spike policy on your lease? Do you shoot every one you see, or do you let them walk? And have you ever let a spike go and actually watched him turn into something worth putting on the wall?
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