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Tasty Treat: Are Sweet Potatoes Better Than Carrots?

Question: A friend suggested feeding my horses raw sweet potatoes as treats because they have less sugar than carrots. I hadn't given much thought to this. Is she onto something here?

Kentucky Equine Research responds: Both sweet potatoes and carrots can be offered to your horses as treats. Carrots contain about 88 percent water, while sweet potatoes have about 77 percent, making sweet potatoes slightly more nutrient-dense. Both are relatively poor sources of protein because of the high water content (carrot, 0.9 percent; sweet potato, 1.6 percent; as fed).

The primary nutrient difference lies in the carbohydrate content of the two root vegetables. Although the fiber content (carrot, 2.8 percent; sweet potato, 3 percent; as fed) and the simple sugar content (carrot, 4.7 percent; sweet potato, 4.2 percent; as fed) are similar, sweet potatoes are much higher than carrots in starch (12.9 percent and 2.1 percent; as fed, respectively). Looking more closely at the type of starch in the sweet potatoes, 80 percent is rapidly digestible (enzymatic digestion), while only 11 percent is resistant starch only fermentable by microbes). Sweet potatoes provide over twice the calories that carrots do (86 and 41 calories, respectively, per 100 g), mostly because of the difference in starch content. In this context, “as fed” refers to raw vegetables and “dry matter” to dehydrated vegetables.

While dehydrated sweet potatoes have less sugar than dehydrated carrots (18 percent and 40 percent, respectively), they have similar levels when fed raw (4.2 percent and 4.7 percent, respectively), as noted previously.

Both are rich sources of beta-carotene, which is the precursor to vitamin A.

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Despite their names, sweet potatoes and Irish potatoes are not closely related from a botanical standpoint. Sweet potatoes and yams are vines in the morning glory family, whereas Irish potatoes are in the nightshade family. Sweet potatoes do not contain the nutritional anti-factors that make raw Irish potatoes unsafe for horses to consume.

Sweet potatoes can be a tasty treat for horses either raw or cooked. Due to their relatively high starch and sugar content, they should be fed in only small amounts. Feeding large amounts carries some risk, especially when given to starch-sensitive horses. In addition to beta-carotene, sweet potatoes are a good source of vitamin C and potassium.

Ask the Expert: Fall Grazing

Owners and caretakers of metabolically challenges horses are often aware of the health hazards ingesting lots of fresh, spring grass can bring on their charges, but grazing horses on lush pastures in the fall is fraught with its own set of perils.

Frost damaged pastures can have higher concentrations of nonstructural carbohydrates, leading to an increase in the potential for founder and colic, especially in horses diagnosed with or prone to obesity, laminitis, Cushings disease and Equine Metabolic Syndrome. To help prevent these health issues, at-risk horse owners should wait up to a week before turning horses back onto a pasture after a killing frost. Subsequent frosts are not a concern as the pasture plants were killed during the ﬁrst frost.

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Why do nonstructural carbohydrates increase during the fall? During the day, plants carry out the process of photosynthesis. In this process, they make carbohydrates as an energy source for the plant. A second process, respiration, is carried out when the plants use up the carbohydrates they produce during the night for energy. Plant respiration slows down when temperatures are near freezing. As a result, the plants hold their carbohydrates overnight. Freezing can stop respiration and lock the carbohydrates in the plant for over a week. Thus, plants tend to contain more carbohydrates in colder temperatures or after a frost. Often, horses will prefer forages after a frost due to the higher carbohydrates levels.

Get The Scoop On Horse Feed From An Equine Nutritionist

Let's go back in time to 1821—for sake of entertainment, you can be a horse.

You're a drafty fellow, and there are fields to plow, wagons and carriages to pull and the five-day workweek has yet to be heard of, especially for a horse out on the farm. Like the steady workhorse that you are, you're hoofing 10 to 15 hours per day, expending a lot of energy and calories. Your source of food includes grazing low-quality forage (hungry yet?).

Dr. Jyme Nichols, director of nutrition at Stride Animal Health, says this is about the time cereal grains were introduced into horses' diets. The grains most popular and accessible to feed horses included corn, barley and oats. Knowing horses required higher levels of fiber, as it's safest for them and their diet, oats had the highest level of fiber and was a natural choice to feed for extra calories that provided horses with extra energy.

“Fast forward to present day – we have horses kept in stalls or in small turnouts, and they may have very limited hours of riding. That horse that used to work 10, 12 or 14 hours a day now maybe only works an hour a day when we have time to ride them. The rest of the time, they spend eating. But they are still receiving the same concentrated grain meal that we were giving them many years ago when they were working so hard. If you take a high-starch feed like that and overfeed them, you can make a horse very excitable or crazy,” said Dr. Nichols during an interview with Valley Vet Supply.

Equine nutrition is complex – there is no sugar-coating that; however, Dr. Nichols warns there is plenty of “sugar-coating” when it comes to our horse's grain choices, and that along with high starch are just a few aspects to consider relating to our horse's nutritional program.

With insight from Dr. Nichols, let's review top equine nutrition FAQs.

Does my horse need supplements?

The answer to that is never black or white. It depends on what you are doing with your horse; how old your horse is; whether you're feeding your horse a forage-only diet or whether your horse is on feed. It also depends on if your horse is dealing with certain problems, like if they have arthritis, gut issues or specific needs that are outside of what we would consider 'normal,' more basic nutritional needs.

Does protein make horses hot?

No, it doesn't. It is the starch and sugars in what you are feeding that make horses hot. There is some confusion about protein—it's commonly thought that horses need more feed, more protein and more nutrients, so we're going to feed this higher-protein feed. But what owners may not realize, is that when they were feeding that higher-protein feed, they were also feeding more of it. It wasn't necessarily the high protein that was making the horses become excitable. It was the fact they were feeding a really large volume of a high-starch, high-sugar feed.

Nutritionally, how can I manage or prevent a “hot” horse?

If you have a horse that is naturally more excitable and anxious, one of the better things you can do is look for a diet that is high in fiber and pull your calories from fat sources. Those fat sources are called “cool energy calories,” meaning it gives horses the calories that they need, but it's not going to make their mind and their attitude hot and excitable. For energetic horses, avoid high starch feeds. Refer to the feed tag for the “NSC,” which is the combination of starch and sugar. “NSC” stands for non-structural carbohydrates. You get to that number by adding the starch number on the feed tag to the sugar level. As a general rule of thumb for feeds considered “low starch,” if you were to add the starch and the sugar together, that number shouldn't be over 22 percent.

Can sugars impact certain horse health conditions?

For PPID horses or Cushing's horses, starch and sugar are really important in the diet to help manage. If you have a horse with a medical sensitivity, such as a horse with Cushing's, laminitis or equine metabolic syndrome – the medical sensitivity to sugar means you need to make sure that your NSC is under 12 percent. After that, you want to make sure you're feeding at the recommended levels of the feed. If you're not – and let's say that particular feed calls for 6 pounds per day and you're only feeding those horses 3 pounds per day, you're shorting them in important trace minerals or vitamins.

How do you nutritionally manage a horse that ties up frequently?

There is not a generic answer. But keep horses off green grass [which has higher sugar content]; feed low-starch, low-sugar feed; and make sure you have a proper balance of trace minerals, macro nutrients and vitamins. Also, ensure they have daily exercise.

How do I know if my hay is meeting their basic needs?

First off, do a visual check and body condition assessment of your horse. Look at rib cover – you should be able to easily feel but not easily see, ribs. Next, you'll want to look at the topline. You want the horse's topline to be essentially flat. If they can hold water on their spine on a rainy day, that tells you they're in a bit of an excess body condition. But if rain were to pour on them and just run off, and their spine peaks up like a mountain, then that tells you their body condition is probably a bit under. But the most concrete thing you can do is get your hay tested. Getting that information is the most important thing you can do, because forage is the foundation of your horse's diet and it is so important to understand what you are feeding.

Is There Such A Thing As Too Many Carrots?

Many horse owners and caretakers offer their horses treats as a reward or as a sign of affection, and most horses willingly eat the more-traditional treats of apples and carrots. But is there such a thing as too many treats? Can feeding too many harm a horse's health?

Some horse owners feed up to 10 gallons (or more) of carrots to their horses with no ill effects, reporting that the carrots add weight and are a good water substitute. Kentucky Equine Research notes if the horse doesn't have metabolic issues, there is most likely no harm in feeding that quantity of carrots, but there is concern as to if the horse is obtaining all the dry matter and nutrients needed for a healthy diet.

Carrots are primarily water (85 to 90 percent), so they do assist in keeping a horse hydrated. Assuming one five-gallon bucket of carrots is a meal, the horse would be consuming just 1.5 pounds of dry matter, of which 25 percent is water-soluble carbohydrates. As the horse takes a while to eat through the bucket of carrots, the nearly six ounces of sugar and three ounces of soluble fiber from the carrots slowly enters his bloodstream.

The high amount of water could make the horse's manure loose and provides him with a lot of calories, so he may pack on the pounds. Additionally, the horse's coat may develop an orange tint as some of the beta-carotenes are absorbed as carotenes by body tissues. Carrots do not contain significant amounts of other nutrients.