Beet pulp is the fibrous material left over after sugar is extracted from sugar beets. It’s widely used as an animal feed, particularly for horses, dairy cattle, and dogs, valued for its high digestible fiber and moderate energy content. About 86% of a sugar beet root gets converted into sugar during processing, and the remaining pulp is dried and sold as feed or used for other industrial purposes.
How Beet Pulp Is Made
Sugar beet processing starts with hot water diffusion, where sucrose is pulled out of sliced beet roots. The extracted juice is then purified, concentrated, and crystallized into table sugar. What’s left behind is a wet, fibrous mass: beet pulp. Factories dry this pulp and sell it in two forms. Some producers add molasses back to the dried pulp for extra palatability and energy, while others sell it “unmolassed” for animals that need a lower-sugar diet.
Nutritional Profile
Beet pulp is unusual because it’s high in digestible fiber but relatively low in sugar and starch. Unmolassed beet pulp typically contains less than 10% sugar, making it suitable for animals on restricted-sugar diets. Molassed versions average less than 15% sugar. The fiber in beet pulp is largely pectin, a type of soluble fiber that ferments differently than the starch found in grains. This distinction matters for digestive health across species.
In terms of energy, beet pulp delivers roughly 1.2 Mcal of digestible energy per pound on a dry-weight basis, based on analysis of over 600 samples. That puts it on par with alfalfa pellets and makes it a useful calorie source for animals that need to gain weight without the digestive risks associated with high-grain diets.
Beet Pulp for Horses
Horse owners are probably the most common buyers of beet pulp. It serves as a calorie-dense fiber source that can supplement or partially replace hay, especially for hard keepers, older horses with dental problems, or horses prone to metabolic issues. Because its energy comes primarily from fermentable fiber rather than starch, it’s gentler on the hindgut than grain-based feeds.
The main safety concern with beet pulp in horses is esophageal obstruction, commonly called choke. In one retrospective study of 74 choke cases, beet pulp was the most frequently identified cause, accounting for 15 cases. Another study of 60 choke cases found beet pulp responsible for three of them (5%). The common thread in these cases was rapid eating and inadequate chewing, not the beet pulp itself being toxic. Pelleted forms are a particular concern because they can swell rapidly after being swallowed, potentially expanding during transit through the esophagus.
Soaking beet pulp before feeding is the standard recommendation to reduce this risk. The typical method is placing the pulp in a bucket and adding twice as much water by volume. Shreds absorb water quickly, often ready in under an hour. Pellets take longer but can be sped up with hot water (cooled before feeding). Research confirms that horses fed soaked pellets chew more intensely, eat more slowly, and spend more time at the feeder compared to horses eating dry pellets. No cases of choke were observed during the study’s experimental periods.
Shreds vs. Pellets
Beet pulp is sold in two physical forms. Shreds are thin strips, roughly half to three-quarters of an inch long and about one-sixteenth of an inch wide. They rehydrate quickly and are generally considered the easier, lower-risk option. Pellets are compressed, often quite hard and large. They take longer to soak but are denser, which makes them easier to store and measure.
Once soaked, beet pulp stays good for about 24 hours at moderate temperatures. In hot, humid conditions it can spoil faster. If it smells like vinegar or wine, it’s fermented and should be thrown out.
Beet Pulp in Cattle Diets
Dairy farmers use beet pulp as a partial replacement for corn or barley in high-concentrate diets. The benefit comes down to rumen chemistry. When cattle digest grain, the starch fermentation produces large amounts of lactate and propionate, which can drive rumen pH dangerously low, a condition called acidosis. Beet pulp’s pectin ferments through a different pathway that produces less lactate and doesn’t interfere with the digestion of other fiber sources.
In a study published in the Journal of Dairy Science, cows fed beet pulp in place of barley or corn had higher rumen pH at four hours after feeding (6.39 versus 6.20) and produced milk with higher fat content (3.15% versus 2.92%). They also converted feed to milk more efficiently. These results make beet pulp a practical tool for maintaining digestive health in high-producing dairy cows eating grain-heavy rations.
Beet Pulp in Dog Food
If you’ve read the ingredient list on a bag of dog food and spotted beet pulp, it’s there as a fiber source, not a filler. Beet pulp is classified as a moderately fermentable fiber, meaning gut bacteria can break it down at a pace that produces beneficial byproducts without causing excessive gas or loose stools. Rapidly fermentable fibers tend to cause digestive upset, while completely indigestible fibers just pass through. Beet pulp sits in a useful middle ground.
Research on canine gut health shows that beet pulp, rich in soluble fiber, can shift the composition of intestinal bacteria in a favorable direction. Dogs fed beet pulp showed increased levels of beneficial lactobacilli and bifidobacteria, along with reduced counts of a harmful bacterium associated with digestive illness. This prebiotic effect is one reason beet pulp appears so frequently in commercial pet food formulas, particularly those marketed for digestive health.