Leena Watts
The American bison is a national symbol of the United States, and its history is intertwined with that of Native Americans. As herbivores, their diet consists of grass, sedges, and shrubbery. However, the diet of American bison has been altered by the bison industry, which predominantly finishes them on grains. This is in contrast to their natural diet, which varies seasonally and is influenced by climate and vegetation changes.
| Characteristics | Values |
|---|---|
| Diet | Grass, legumes, shrubs, sedges, grains |
| Dietary quality | Greatest in cold, wet climates |
| Seasonal patterns | Dietary quality peaks in June, highest in warmer regions in April |
| Protein | Bison are protein-deficient; legumes contributed 20% more protein in September 2019 |
| Grass-fed vs grain-fed | Grass-fed bison is leaner and has a more desirable omega-6 to omega-3 ratio |
| Grass-fed vs grain-fed | Grass-fed bison has a higher moisture content and is higher in beta-carotene and conjugated linoleic acid |
| Grass-fed vs grain-fed | Only 20% of the bison supply chain is grass-fed |
| Male vs female diet | Male bison select better-quality food and grow to a very large size |
Explore related products
What You'll Learn
American bison are herbivores, eating grass, shrubs, and sedges
The American bison is a national symbol of the United States, joining the ranks of the Bald Eagle. Once roaming in vast herds of up to 60 million in the late 18th century, the species was nearly wiped out in the 19th century due to commercial hunting, slaughter, and the introduction of bovine diseases from domestic cattle. By 1889, only 541 American bison remained.
Today, the American bison is a protected species, and its diet remains largely herbivorous. American bison graze on the grasses and sedges of the North American prairies. They are ruminant animals, biologically engineered to consume grass and convert that cellular material into nourishing meat through their four-chambered stomachs. In addition to grass, American bison will also eat any available low-lying shrubbery. During the winter, when grass is scarce, bison will forage for grass under the snow, and if they are still unable to find grass, they will eat the twigs of shrubs.
The diet of the American bison changes with the seasons. Bison tend to select plants with the highest protein or energy concentrations at a given time, and they will reliably consume the same species of plants across years. For example, bison in warmer regions will take advantage of the earlier phenology of plants in the south, whereas bison in colder regions will opt for plants in colder, wetter climates. In addition, the protein concentrations of the plants they eat tend to be highest in the spring and then decline, reaching their lowest point in the winter.
The availability of different types of vegetation in their habitat also influences the diet of American bison. On shortgrass pasture, bison predominantly eat warm-season grasses, whereas on mixed prairie, cool-season grasses and some sedges make up 79–96% of their diet. In montane and northern areas, sedges are selected throughout the year.
Positive People's Diet: Eat Happy, Live Longer
You may want to see also
Explore related products
Seasonal vegetation changes impact bison diets
Bison are herbivores and grazers, eating grasses and sedges and occasionally browsing on shrubs and low-hanging trees. Seasonal vegetation changes do impact bison diets, with the animals selecting plants with the highest protein and energy concentrations at a given time.
Bison are biologically engineered to consume grass, and their daily schedule involves two-hour periods of grazing, resting, and cud chewing, followed by moving to a new location to graze again. They are known to shift the plants they select over the year, and protein concentrations of the plants they eat are typically highest in the spring, declining to their lowest in the winter.
In warmer regions, dietary quality is highest in April, likely due to the earlier phenology of plants in southern regions. Dietary quality peaks in June and is generally greatest in cold, wet climates. In September, legumes contribute 20% more protein, and warm-season grasses 14% less than in the previous year.
On shortgrass pasture, bison predominantly consume warm-season grasses, while on mixed prairie, cool-season grasses and some sedges make up 79-96% of their diet. In montane and northern areas, sedges are selected throughout the year. While bison primarily eat grass, they will turn to shrub twigs if grass is scarce in winter.
In modern times, the bison industry has seen a shift towards grain-finished bison, with 80% of bison in North America being fed grains such as corn, wheat, barley, and oats. This has led to concerns about the accessibility of 100% grass-fed bison, which is considered healthier and more environmentally sustainable.
Diet Therapy: Fact and Fiction
You may want to see also
Explore related products
Bison in captivity are often fed a diet of grain
Bison are herbivores and grazers, and their main foodstuff is grass. They will also eat any available low-lying shrubbery, as well as sedges. In the winter, bison will forage for grass under the snow and, if there is little grass available, they will eat the twigs of shrubs. In the wild, bison select their food based on which plants have the highest protein or energy concentrations at a given time.
Bison in captivity, however, are often fed a diet of grain. As of 2016, approximately 61,300 bison were harvested per year in the United States, with 80% of these being finished on grains like corn, wheat, barley, and oats. This is because, in confinement, bison are moved to a diet of grain, which is more readily available than grass. Grass-fed bison are leaner than grain-fed bison, and have a higher moisture content, which gives the meat its unique, slightly sweet flavor. Grass-fed bison are also higher in beta-carotene and conjugated linoleic acid, which is linked to a reduced risk of cancer, diabetes, and obesity.
While it is more convenient to feed bison grain, some consumers are pushing for a shift to grass-fed bison. As of 2019, only about 20% of the bison supply chain is grass-fed and finished, and it is difficult for consumers to find 100% grass-fed bison meat in grocery stores. Consumers are encouraged to carefully inspect packaging for claims that align with their values, as nationally distributed bison brands will often use the term "Natural Bison", which indicates that the animal was fed a diet of grains.
Moderation in Dieting: Finding Balance and Health
You may want to see also
Explore related products
Grass-fed bison meat is leaner and has a higher moisture content
The North American Bison is an iconic animal, often associated with large, free-ranging herds grazing on grassland prairies. As ruminant animals, bison are biologically designed to eat grass and convert it into nourishing meat. Despite this, many consumers are unaware that the majority of bison are moved from pasture-based ranches to confined systems where they are fed a diet of grain. In 2016, it was estimated that 61,300 bison were harvested per year in the United States, with 80% of these being grain-finished.
Grass-fed bison meat is leaner than grain-fed bison meat. Contrary to the popular belief that more intramuscular fat results in better flavour, the unique, slightly sweet flavour of bison meat actually comes from its moisture content. Studies have shown that grass-fed bison has a higher moisture content than grain-fed bison. The fat present in grass-fed bison is yellowish, while grain-fed bison fat is white.
Grass-fed bison meat is also healthier than grain-fed meat. It has been found to have four times the selenium of grain-fed meat and is higher in beta-carotene, which is important for vitamin A production. It is also a source of conjugated linoleic acid, which is linked to a reduced risk of cancer, diabetes, and obesity. Grass-fed bison also has a more desirable omega-6 to omega-3 ratio than grain-fed bison, which has an extremely high ratio of 8:1.
While it may be difficult to find 100% grass-fed bison, consumers can help to increase its availability by demanding higher-quality meat and carefully inspecting packaging for claims that align with their values.
Veggie-Free Diets: Healthy Supplementation Strategies for You
You may want to see also
Explore related products
Bison are better browsers than cattle
Bison are also better adapted to utilising low-quality feeds, which can be advantageous in regions with short growing seasons. They are easier to manage than cattle, functioning well as a single herd and requiring less labour to move between pastures. Bison are also heavier than their European counterparts and have a longer breeding lifespan, resulting in higher lifelong production. Additionally, bison have lower calving mortality rates of 1-3% compared to 5-7% in cattle.
Bison have a lower impact on the environment than cattle. They eat grasses but not wildflowers, and they float just above the ground to avoid stepping on plants or compacting the soil. This perception of bison as magical creatures that live in complete harmony with the prairie has led some conservation groups to use their images on fundraising materials.
Overall, bison are better browsers than cattle due to their ability to thrive on grass, their positive impact on the environment, and their ease of management.
Diets as Performance Enhancers: Doping Through Food
You may want to see also
Frequently asked questions
American bison are herbivores and grazers, eating grass and sedges. They also eat any available low-lying shrubbery and twigs if grass is scarce.
Yes, American bison diets do change seasonally. They eat more legumes and less warm-season grass in the early summer, and their diet is generally higher in protein in the spring and lower in the winter.
Yes, most bison in captivity are fed a diet of grains like corn, wheat, barley, and oats.
Bison in captivity are fed grains because it is more convenient for ranchers than providing nutrient-dense grasses.
