Milly Gaines
Deer are highly adaptable herbivores that browse for food rather than graze, eating parts of woody vegetation that are off the ground. They are picky eaters, constantly trying to balance their nutrient intake with changes in seasons, forage abundance, quality, and their life stage and corresponding protein and/or energy needs. Their diet consists of a variety of food types, including browse (leafy parts of woody plants), forbs (herbaceous broad-leaved plants, including agricultural crops), hard and soft mast (seeds), grass, and mushrooms/lichens.
| Characteristics | Values |
|---|---|
| Dietary items | Leaves, buds, twigs, bark, berries, apples, acorns, corn, soybeans, grass, seeds, crops, moss, mushrooms, lichen, and hundreds of plant species |
| Dietary preferences | Browse (leafy parts of woody plants), forbs (herbaceous broad-leaved plants), mast (seeds), and mushrooms/lichens |
| Dietary behavior | Deer are herbivores that browse rather than graze, eating parts of woody vegetation that are off the ground |
| Dietary adaptability | Adaptable, with diets varying based on region, season, and availability |
| Nutritional needs | Protein (14-20%), fibre, and limited carbohydrates |
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What You'll Learn
- Deer require a diet that's 14-20% protein, with demands changing seasonally
- They eat woody browse, forbs, and mast, with browse being less preferred
- They adapt their diet based on seasonal changes and available food sources
- Deer are picky eaters, constantly balancing nutrient intake with seasonal changes and life stages
- They can eat some human food, but this can lead to aggression and harm
Deer require a diet that's 14-20% protein, with demands changing seasonally
Deer are herbivores that browse rather than graze, meaning they eat parts of woody vegetation that are off the ground. They are picky eaters, constantly trying to balance their nutrient intake with changes in seasons, forage abundance, quality, risk, life stage, and corresponding protein and energy needs. Their diet varies depending on the region, and they can usually find the nutrients they need to sustain themselves.
Deer require a diet that is 14-20% protein, with demands changing seasonally. For instance, bucks and does need more protein in the spring when they are growing horns or offspring. In the colder months, deer rely on woody browse for calories and nutrients. They eat a lot of woody, fibrous material that their digestive system has to work hard to break down. Their stomachs expand to accommodate the need for greater quantities of lower-quality food, and their microbe community adapts, with different species proliferating at different times to utilise different foods.
During the spring, deer eat fresh plant shoots and buds, followed by berries in the summer, and ripened apples and acorns in the fall. In the winter, they survive almost exclusively on woody twigs, branches, and other fibrous materials. Deer eat a variety of food types, including browse (leafy parts of woody plants), forbs (herbaceous broad-leaved plants, including agricultural crops), hard and soft mast (seeds), grass, and mushrooms/lichens.
Mast is highly preferred by deer, and its presence drives seasonal variation in forage selection. Mast consumption increases from 11% during the summer (primarily soft mast, like berries) to 28% during autumn (mainly hard mast, such as acorns). Browse and forbs are the most important forages, providing over 80% of the deer's diet in all seasons except autumn.
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They eat woody browse, forbs, and mast, with browse being less preferred
Deer are herbivores that browse rather than graze, meaning they eat parts of woody vegetation that are off the ground. They tend to be picky eaters, constantly trying to balance their nutrient intake with changes in seasons, forage abundance, quality, risk, and their life stage and corresponding protein and energy needs. Deer consume a large variety of plant species, but their diet is dominated by browse, forbs, and mast, with browse being less preferred.
Browse
Browse is the leaves, buds, and ends of twigs from woody to semi-woody broad-leaved plants, including trees, shrubs, briars, and vines. Browse is often the result of mid- and late-successional plant growth and is the predominant cover type found across most hunting lands in the United States, making it a large component of deer diets. The woody portions are often the only thing deer eat during winter, but browse is only moderately preferred due to its higher fibre content and lower digestibility. When eating browse, deer tend to consume the youngest shoots and leaves, which have the highest digestible energy.
Forbs
Forbs are herbaceous (non-woody) broad-leaved plants that are not grass-like. They are used almost exclusively for forage and include agricultural crops. Examples of forbs include clovers, sunflowers, daylilies, and milkweed, chicory, fodder beets, and annual Kochia.
Mast
Mast includes hard and soft mast (seeds), with soft mast including berries and hard mast including acorns. Mast is highly preferred, and its presence drives seasonal variation in forage selection. Mast consumption increases from 11% during the summer to 28% during autumn.
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They adapt their diet based on seasonal changes and available food sources
Deer are highly adaptable animals, and their diet varies depending on the season and region. They are herbivores that browse rather than graze, meaning they eat parts of woody vegetation that are off the ground. Deer tend to be selective eaters as they try to balance their nutrient intake with seasonal changes, available forage, quality, and their life stage.
During the spring, deer feed on fresh plant shoots and buds. In the summer, their diet includes juicy berries, and they also eat corn once the ears are filled out. They continue to eat corn left in the fields after harvest, demonstrating their adaptability in utilizing available food sources.
As the seasons transition to autumn, deer consume more mast, which includes hard mast such as acorns, and ripe apples. The increase in mast consumption during autumn can drive seasonal variations in their forage selection.
In the winter, deer rely on woody browse for calories and nutrients, including twigs, branches, and other fibrous materials. The woody portions of plants may be the only food option during this season, and deer focus on consuming the youngest shoots and leaves within reach, which have higher digestible energy.
Additionally, deer in different regions may have varying diets based on the available food sources. For example, mule deer in the West eat shrubby, drought-resistant growth, especially during the winter. They also consume woody browse and forbs in the spring and early summer.
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Deer are picky eaters, constantly balancing nutrient intake with seasonal changes and life stages
Deer are highly adaptable and their diets vary depending on the region and season. They consume a wide range of plants, but only a small portion of these species typically make up the majority of their diet. Browse (leafy parts of woody plants), forbs (herbaceous broad-leaved plants, including agricultural crops), and mast (seeds) are the most important forages, providing over 80% of their diet in all seasons except autumn.
During the winter, deer rely more on woody browse for calories and nutrients, as these may be the only edible materials available. Their stomachs expand to accommodate larger quantities of lower-quality food, and their saliva production increases to help digest extra-fibrous meals. In the spring and early summer, deer target broad-leaved plants and flowers, followed by tree buds, shoots, and fresh leaves. Protein is an important nutritional consideration, particularly in the spring when bucks and does are growing horns and offspring.
Deer also adapt their diet based on available crops, such as corn, soybeans, and other cereal grains. They will also eat mushrooms, lichen, and other simple, low-growing organisms like moss and lichen. While deer can usually find the nutrients they need, their diet is a constant balancing act, influenced by seasonal changes, available forage, and their own life stage and corresponding protein and energy needs.
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They can eat some human food, but this can lead to aggression and harm
Deer are herbivores and browse for food rather than graze, meaning they eat parts of woody vegetation that are off the ground. They are picky eaters, constantly trying to balance their nutrient intake with changes in seasons, forage abundance, quality, perceived risk, and their life stage and corresponding protein and energy needs. They are also highly adaptable, and their diet varies depending on the region.
While deer can eat some human food, it is not advisable to feed them. Human-introduced foods can harm deer, frequently resulting in their death. Their highly specialized digestive system can be disrupted by unnatural foods, such as bird seed, alfalfa, grain, corn, and other non-native foods. This can lead to severe nutritional deficiencies and even organ failure.
Supplemental feeding of deer can also attract more dangerous animals and increase the risk of wildlife-vehicle collisions. Fed deer may lose their fear of humans, leading to injuries or death for the animal, pets, or even people. Additionally, feeding deer can make them partially tame, detracting from their value as wild animals.
Deer can also spread certain diseases to humans, such as Lyme disease transmitted by ticks. Therefore, it is best to observe deer from a distance and not attempt to domesticate them, as they may become unhappy or aggressive in captivity.
If you want to keep deer from treating your garden as a food source, you can plant things they don't prefer, such as lavender or lamb's ear, or apply deer repellent to your plants.
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Frequently asked questions
Deer are herbivores that browse rather than graze, meaning they eat parts of woody vegetation that are off the ground. This includes leaves, buds, twigs, bark, and shoots. They also eat grass, crops, berries, apples, acorns, and other seeds.
Deer must constantly shift their diets to meet their nutritional needs with whatever’s available in their environment. In the winter, deer rely more on woody browse for calories and nutrients. In the spring and summer, they eat broad-leafed plants, flowers, and fresh leaves.
Deer eat diets that are heavy in fiber and light on carbohydrates. Protein is also an important nutritional consideration, as deer require it for optimal antler growth, lactation, and other natural processes. The ideal diet for deer seems to be 14 to 20 percent protein.
Foods that are carbohydrate-rich, such as corn, wheat, barley, and other grains, should be avoided when feeding deer.
