White-tailed Deer Food Preferences

White-tailed Deer Food Preferences

It is commom knowledge that deer need food, water, shelter and space for survival. When a casual observer sees the countryside with abundant trees and plants it may appear that deer have plenty to eat. But that is not necessarily the case. First, some plants are not edible. Second, some plants are not palatable. And lastly, some are only availalbe at certain times of the year. White-tailed deer use three major plant groups as food.

They are: 1) forbs, which consists of broadleaf herbaceous weeds, 2) browse, which consists of leaves and tender twigs of woody plants, and 3) grasses. Deer flat-out prefer forbs, but these plants are normally available only in certain seasons and if rains do not come at the right time, they may not be available at all.

Contrary to popular belief, deer consume only a very small amount of grass and usually only when it is young and tender. Because both deciduous and evergreen woody plants are readily available, browse tends to be the most stable source for white-tailed deer over much of the deer’s range.

Of course, among browse plants, deer have definite preferences. The land/deer manager who understands those preferences and the seasonal browse habits of deer can judge the success of management practices aimed at improving rangeland for the production of high-quality white-tailed deer.

The nutritional status of deer is determined by the palatability, availability, and quality of the food supply, Palatability is the combination of characteristics (tenderness, taste, smell, etc.) that influence an animal to eat a food. Palatability has the most to do with an animal’s preference for certain food items until the availability of those foods decreases. At that point, a deer’s diet is determined more by what food is available.

The availability of food, of course, is dependent upon the current year’s production on forage (as influenced by rainfall) and the intensity of browsing by herbivores. Supplemental feeding, either through protein pellets or food plots, increases the availability of forage. However, food plots also depend upon rainfall unless irrigation capabilities exist.

Food quality, the final factor, is typically expressed as crude protein and digestibility. These measures reflect the nutritional value of food. Some people believe that deer and other animals have a natural instinct for identifying and consuming forage plants that are the most beneficial from a dietary standpoint. This controversial concept is known as “nutritional wisdom.” It implies that an animal knows what it needs to eat in order to maintain a high level of nutrition.

There is no scientific proof to support this contention and I personally don’t subscribe to this line of thinking. I believe deer, like people, learn through trial and error. If a deer takes a bite of a plant and it taste good, they eat more. Otherwise, on to the next plant.

5 Replies to “White-tailed Deer Food Preferences”

  1. George, deer will not look to consume buckeye nuts. The nuts are believed to be somewhat toxic and they are considered a food of last resort (i.e. starving deer), which means they do not like them.

  2. I have a 60 acre piece of woods in Sussex County, Delaware, that my family has owned since 1686. It’s the remnant of 1,600 acres we owned by 1700; all left with daughters. My woods for years had several prized small botanicals that have disappeared; I will name them for you, both common and botanical, and ernestly solicit your opinion if deer are tha cause; I do not see any signs of overbrowsing on any of the woody plants, except I attempted to start Pawpaws (asimina triloba) and the saplings were consumed entirely. I have held off attempting American chestnuts for that reason.

    We had thousands of ladies slippers (cypropedium acule) and now there are none; the same holds true of trailing arbutus (epigaea repens), teaberry (gaultheria procumbens), pipisissewa (chimaphila umbellata), partridge berry (mitchella repens), and I think our 2 members of the club moss family, turkey beard, ground pine, running cedar, crows-foot, all names of lycopodium digitatum and obscurum.

    There has been no significant change in the piece other than the usual seasonal variations in rainfall and temperature. The property was last logged off in 1960-61, and the plants I have mentioned continued without any hesitation. Other than the usual population of squirrel, opossum, racoons, etc., the other inhabitants recently sighted are 20-25 head of wild turkeys. Thanking you for your consideration.

  3. Ronald, from what you have written, I suspect white-tailed deer are very much responsible for the disappearance of your missing plant species. Although you may not see signs of overbrowsing on some browse plants, deer can still overuse forbs and more preferred woody plants. Deer prefer forbs over browse in most cases. It sounds like forbs are being eliminated on your property and some browsing pressure exists. If the deer population continues to increase then you will see further sign of overuse. I would contact your local DNR for a list of plants deer consume in your area just to verify.

    Also, check out these articles to get a better understanding on how deer forage: Browse Use by Deer, Food Preferences by Whitetail.

  4. Whitetail deer eat a lot of different foods depending on the time of year. When browse plants are producing new growth deer will eat them readily. When it rains, the tasty weeds fit the bill. When ripened fruits hit the ground, then it’s time for more fruit. They are opportunistic, selective feeders that eat numerous plant species.

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