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Body Condition Score

October 5, 2009

What condition is your horse in?

Question:

I’m concerned my gelding is overweight, but I’m not sure how to tell. Please help!

Answer:

To answer this weight-related question, we found a great article from America’s Horse magazine, along with some photos to help you determine the condition of your horse and the best course of action to keep him healthy. Good luck! And remember to always consult your veterinarian about your horse’s nutrition.

Keeping Score

From America’s Horse magazine

Horses are like people; they come in all shapes and sizes. But being too thin or too heavy can affect their health, fertility and performance. It is the duty of the owner to ensure the horse falls into the “just right” category.

Horses can have a body condition score of 1 to 9, with 1 being emaciated and 9 being obese. An ideal BCS would be a 5, however a slightly higher or lower score might be acceptable depending on the horse’s use.

The score is determined by examining the condition of the neck, withers, loin, tailhead, ribs and shoulder. The stomach is not a good indicator of body condition. Horses can have a big belly and still be in poor condition due to consuming low-quality forage, having internal parasites or simply being out of shape.

“If we expect our horse to perform to the best of his ability, we have to give him every chance we can in terms of his physical condition,” says Teresa Slough, an assistant professor at Kansas State University with a master’s degree in equine nutrition.

Too Thin

A horse with a BCS of 1 will be emaciated, meaning his entire skeleton is visible and there is virtually no fat on the horse, Teresa says.

“Horses in this range will definitely experience a decrease in fertility and performance and, in a worst case scenario, death,” Teresa says.

Although, a BCS of 2 is better than 1, it still isn’t healthy. There will be a slight fat covering over the backbone and ribs, but for the most part, all bones will be visible.

Click on each of the five photos to see the body condition score.

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A horse with a BCS of 3 will still be thin, but is far better off than a 1 or 2. These horses will have fat cover over their ribs, but the ribs are still noticeably prominent. Individual vertebrae can’t be distinguished, but the horse will look thin through the neck, withers, tailhead, loin and shoulders.

Teresa says the first step to helping horses with a low BCS is contacting a nutritionist, veterinarian or both immediately.

“Horses with a low BCS are not getting enough energy in their diet,” she says. “This could be due to old age, poor quality feed, not enough feed, bad teeth, internal parasites, disease, sickness or a combination of problems.”

Horses can only eat 2.5 percent of their body weight in dry matter per day. Therefore, when feeding an emaciated or thin horse, feed a concentrate in addition to high-quality hay, like alfalfa.

Teresa also recommends adding a fat source to their diet. Fat contains 2.25 times more energy than carbohydrates and will help pack on the pounds. There are many different fat sources, but the most common in the horse industry are vegetable oil and rice bran.

Jason Shelton, Nutrena equine nutrition research manager, suggests feeding probiotics, a dietary supplement containing potentially beneficial bacteria or yeast, to increase the digestion of feed. He also says feeding horses separately two to three times per day will ensure that thin horses are getting the nutrients they need.

“It generally takes about one month to change one point on the BCS scale,” Teresa says. “Make changes to the diet gradually to avoid microbial upset in the digestive tract.”

Just Right

A horse with a BCS of 4 is moderately thin, but considered healthy. Being moderately thin is beneficial in some high-performance events, such as racing and endurance. Horses will not look obviously thin; however, the ribs are still slightly visible.

“These horses are certainly not fat, but they aren’t unhealthy either,” Teresa says.

A BCS of 5 is considered ideal for most horses. These horses’ ribs can be easily felt, but not seen. The neck, withers, tailhead, loin and shoulder do not look thin and blend smoothly into the body.

Teresa recommends assessing the horse’s activity level and then deciding how to maintain a BCS of 5, if change is necessary.

“Most horses can maintain a moderate BCS with average-quality hay,” she says. “Performance horses probably need a concentrate and a high-quality hay to meet their energy needs and maintain optimal condition.”

A BCS of 6 is considered moderately fleshy. This horse will begin to have fat deposits throughout the body, particularly over the ribs, and will have a small groove down the back.

This score is recommended for broodmares due to the intense energy requirements of late gestation and lactation. Mares can be fed at maintenance for the majority of their pregnancy, but Teresa says their energy needs will increase by 20 percent during the last three months of pregnancy. When the mare begins lactating, her energy requirement will increase by 80 percent. If a mare has a BCS of 6, she can lose a little bit of weight due to lactation and still have a healthy BCS.

Teresa says some show horses also tend to have a BCS of 6, although it is due to visual preference and not need.

A horse with a score of 7 is fleshy and has spongy-feeling fat all over his body. The ribs can still be felt, but fat is noticeable between each rib. The horse will have a distinguishable crease down the back and a crested neck.

This score may also be acceptable for broodmares, particularly those that tend to have big foals or lose a lot of weight during lactation.

If the horse is considered at maintenance, meaning it does not have extensive energy requirements, Teresa suggests eliminating grain from the diet, limiting fat intake and feeding lower-protein forage.

“People feed grain because that’s what everyone does,” Teresa says. “We have really put horses into an artificial environment by feeding them energy-dense feeds and limiting their exercise.”

Most horses can live on low-protein roughage, such as prairie or brome hay, without any type of grain or fat supplement.

“If a horse is overweight, people tend to see a ‘hay belly’ and cut back on its forage intake,” she says. “This can cause a huge upset in the horse’s digestive tract if its hay consumption is reduced and the concentrate is left the same.”

Too Fat

A horse with a BCS of 8 is no longer considered healthy. This horse has a noticeably thick neck, the area on either side of his withers is filled with fat, the tailhead fat is very soft, and there is no distinct separation of shoulder and girth.

By the time a horse reaches a BCS of 9, there are fat bulges on his neck, withers and shoulder. There is no distinguishable flank area, and patchy fat appears over the ribs.

“Obesity in horses is on the rise,” Jason says. “It is leading to insulin resistance and many bone and joint issues.”

Horses with a score of 8 or 9 might also be susceptible to equine metabolic syndrome and chronic laminitis. Teresa says an obese horse is simply overloading his legs and joints.

Obese horses are more prone to colic and founder and are less efficient about regulating their body temperatures,” Jason says.

Teresa recommends feeding an obese horse a low-protein roughage and no concentrate.

“If his needs are met with a fairly low quantity of feed, he gets done eating quickly and has boredom vices, then you can put some sort of very low-quality forage in front of him. Then he can munch on something that will keep him entertained without contributing to his obesity,” Teresa says.

She says low-quality forage is very indigestible and should only be fed to prevent boredom and not to meet the horse’s energy needs.

“People think fat is better than thin, when in reality, neither are healthy for the horse,” Teresa says. “A skinny horse looks bad to everybody, but most people don’t realize the hazards that come from the other end of the spectrum.”

She says the best way to prevent straying from an appropriate BCS is to monitor horses closely. If the horse becomes too thin or too heavy, address the problem immediately.

Prepare for Winter

  • Horses drink an average of 10-12 gallons of water per day. Fresh water should be available at all times. In the winter, if heated tanks are unavailable, ice should be broken several times a day. If a horse goes off feed, check his water. Horses will not eat if they are thirsty.
  • A horse’s energy requirements increase by 1 percent for every degree below 16 degrees F. Digesting forage creates more heat than digesting grain, so ample hay should be provided when conditions are harsh.
  • If horses are on pasture, provide hay if the grass is low-quality or snow-covered.
  • If a horse tends to lose weight in the winter, increasing its BCS by one point could be beneficial. Monitor your horse in the fall and spring to establish your plan of action to maintain his winter BCS.
  • Always float teeth and deworm several weeks before winter.
  • Exercise tends to be limited in the winter. Watch easy-keepers to make sure they don’t reach an unhealthy score.