Feeding Corn to Deer? Here’s When It Can Hurt More Than Help

Corn can be a valuable supplemental food source for deer, but only when it is introduced properly. Here’s why timing, consistency and deer digestion matter.

Across much of deer country, summer is when hunters start thinking about supplemental feeding. Corn is easy to find, easy to use and, where legal, almost synonymous with feeding deer.

But before you start pouring yellow gold into a feeder or planning your hunt around a late-season pile, there’s one important thing to understand: feeding corn to deer is less about whether corn is good or bad, and more about when and how it becomes part of a deer’s diet.

Used correctly, corn can provide energy and carbohydrates. Used at the wrong time, it can create serious problems.

Why Hunters Think of Corn First

When you mention supplemental food for deer, the first thing most folks think of is corn. Where baiting is legal, it’s sold by the bushel, and sometimes by the ton. If not for corn, Texas’ deer herd might be a fraction of what it is. Furthermore, regions of the country with the most and biggest deer are primarily agricultural areas where the principal crop is corn.

It seems like corn is great for deer, but that isn’t always the case.

a deer looks into the lens of a trail camera while standing at a pile of feed corn

While it certainly has benefits, corn can be harmful under some circumstances. To understand why, you have to understand the whitetail’s natural diet and complex digestive system.

How a Deer’s Digestive System Works

White-tailed deer belong to a group of animals called ruminants. Their stomach consists of four chambers, the first and largest of which is the rumen. This is where most of the heavy lifting in the digestion process occurs.

As fall turns to winter, leafy vegetation dies and the deer’s diet gradually shifts to coarse, woody browse comprised largely of cellulose and lignin, an indigestible fiber. Strictly speaking, deer can’t digest cellulose, at least not without help.

That help comes in the form of microorganisms—beneficial bacteria in the rumen that possess the necessary enzymes to break down cellulose into nutrients that can be absorbed into a deer’s system.

Why Deer Are Different From Cows

Although they’re both ruminants, deer differ from cows, which have much larger stomachs where they ferment food for a much longer period of time. To get sufficient nutritional value from the food they eat, the deer’s smaller, quicker digestive system must be more efficient than the cow’s, which makes proper rumen function that much more important.

This finely tuned physiological process requires the right combination of microorganisms, enzymes and pH. Achieving that balance doesn’t happen overnight. It can take the deer’s digestive system as long as four weeks to adapt to a new food source.

a nighttime trail camera picture of a whitetail deer walking behind a homemade gravity corn feeder — Where legal, hunters often use corn to both attract and provide extra nutrition for deer. There are several little-known factors regarding corn that everyone using it as feed should know, especially in areas with harsh winters.

When Feeding Corn to Deer Can Cause Problems

The sudden availability of an alternate food source, like corn, can dramatically change a deer’s stomach pH, resulting in a condition called acidosis.

Deer don't know this, of course. They just do what they do and gravitate to an easy meal. But acidosis kills the microorganisms that produce the proper enzymes that allow them to digest cellulose.

Acute acidosis can result in death within 72 hours. In less severe cases, deer simply get sick, making them more vulnerable to disease and predators.

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Acidosis weakens deer at a time when they can’t afford additional drain on their rapidly depleting energy reserves. There are numerous documented cases where supplemental corn feeding in winter has had disastrous effects.

That begs the question: Why would anyone use corn as a supplemental feed?

The short answer? The problem is not the corn, but when and how it is made available.

The Problem Is Timing, Not Corn

The sudden availability of corn after a deer’s system has adjusted to browse is the problem. That, according to Kip Adams, Chief Conservation Officer for the National Deer Association, is one reason food plots are far preferred over feed sites.

With a food plot, deer have access to alternate food during the transition period, and then for as long as the food lasts.

six whitetails mill around a drum corn feeder eating kernels of corn from the ground — Biologists usually recommend food plots over feed sites, but there's no question it's easier to stick up a feeder. Depending on current prices, however, a year-long corn-based feeding program could cost a small fortune.

The same applies to standing corn, which is why it can be a viable food plot crop.

“In the case of corn, the size of the plot and deer density dictate how long the food lasts, but anything lasting a month or more is certainly very beneficial to the deer herd,” Adams said.

If corn is present throughout the transition period and remains present after, the deer’s system will adapt to digest both corn and browse. Whitetails are selective feeders and consume a considerable amount of natural vegetation, even when provided supplemental feed.

Why Biologists Often Discourage Winter Feeding

Of course, that’s another reason biologists typically discourage winter feeding.

Putting so much food in a small place artificially concentrates deer, which can have disastrous effects on the habitat. Natural foods like browse become depleted more quickly, making deer even more dependent on supplemental food sources.

And, if the landowner is trying to grow hardwoods, he’s not going to be happy, either.

How to Feed Corn More Safely

Corn can be an important source of energy and carbohydrates for deer, if provided properly. If you’re going to use it for hunting, begin feeding early. Start before winter sets in and before the deer’s digestive system transitions to a diet of mostly coarse, woody browse.

Do this regardless of when you plan to actually harvest deer. In short, don't run out a week before you start hunting, put out a ton of corn, and then stop feeding corn after you fill a tag or two.

Continue feeding throughout the winter. Deer get conditioned to, and possibly become dependent on, your food. Stopping too soon could have disastrous results.

That is the key lesson with feeding corn to deer: Don’t make it a sudden winter surprise. If you start, you need to start early and stay with it.

two hunters pose with whitetail bucks taken with Weatherby shotguns — Feeding corn is a huge part of the Texas whitetail story. What makes the Lone Star State different is the scale of supplemental feeding and the fact that, in much of Texas, winter conditions don’t create the same late-season dependency concerns seen in harsher northern climates.

Think About Where You Put Feed

Also consider things like proximity to roads and houses. Attracting deer near roads increases the likelihood of car-deer collisions. Concentrated near an artificial food source, deer might impact vegetation on your neighbor’s property, particularly hardwood regeneration.

Furthermore, feed stations can make deer susceptible to stress and injury from predators and domestic dogs.

Better Options for Winter Deer Nutrition

Feed if you must, but deer will be better off if you plant something that will persist through much of the winter. Brassicas and winter wheat are great choices.

A balanced pelletized feed with more protein, fiber and minerals can be a better option than straight corn, but the same rules apply: Start early, introduce it gradually and continue the program into spring green-up.

Corn is not automatically bad for deer, but timing is critical. For hunters thinking about summer supplemental feeding, the best time to consider those risks is before the first bag ever gets opened.