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Slow Down A Speedy Eater By Adding Chaff

It has long been suggested that domestic horses be managed so they might live a life that closely mimics their wild ancestors—this includes the ability to eat nearly continuously in an effort to prevent issues like colic and choke, reports The Horse.

A recent study has found that adding chopped forage (also called chaff) to a horse' feed can prolong consumption time and reduce health risks. The scientists involved in the study report that blending at least 15 percent chaff with a horse's feed can limit the risk of gastrointestinal, metabolic and behavioral problems. Chaff requires less chewing than longer-stemmed hay, but when mixed with grain or pellets, it can slow down a horse that eats rapidly.

A series of studies out of Australia investigated factors that may affect the rate of ingestion, including the addition of chaff to meals. They used two different chaff lengths and considered each horse's breed, weight, gender, meal size, amount of exercise and palatability.

The scientists determined that adding 15 percent chaff to oats prolonged feeding time by up to 50 percent. They note that this addition is based on all-oat meals, so the amount of chaff needed to slow down a horse that is gobbling pelleted or textured feed maybe different.

No difference in feeding times between chaff length were denoted, but longer chaff may slow horses even more. The amount of exercise had no significant effect on feeding time, nor did meal size, age or gender.

The team suggests that horse owners and caretakers slow their horses rate of intake early in the meal, whether by adding chaff to grain meals, providing forage first, mixing feed with hay or extending mealtimes with things like a slow-feed hay net. Additionally, feeding fast eaters first or separating horses to feed them may prevent a horse from bolting his feed and improve equine welfare.

Let Them Eat: Preventing Welfare Issues In Stalled Horses

Horses stalls overnight can spend multiple long hours with nothing in their stomachs, making them eat more rapidly when fed breakfast. German scientists suggest that horses kept inside should have something to chew on nearly continuously through the overnight hours, whether that's a constant supply of hay or their bedding, reports The Horse.

The Horse also notes that any straw horses ingest should be high quality and introduced slowly; a veterinarian or equine nutritionist should be consulted before adding edible straw to a horse's diet.

Dr. Miriam Baumgartner, of the Technical University of Munich, Germany, noted that horses shouldn't be without food in their system for more than four hours at a time. Horses bedded on non-edible bedding like pellets or sawdust are without something to eat for an average of nine hours each night.

When horses are without food for this amount of time, they “rebound” during the day, Dr. Margit Zeitler-Feicht, Baumgartner's colleague, noted. The duo studied 104 horses that were kept in stalls; those that were stalled on non-edible bedding ate faster with fewer pauses than horses that were kept on straw. They also ingested their evening meals more rapidly than horses kept on straw. The research team reports that this could mean that horses housed on inedible bedding may have compromised welfare.

The team concludes that horses should be offered something to eat continuously throughout the night, whether in the form of hay or edible bedding. To deny them the ability to eat continuously can cause health and welfare issues.

Fall Allergies Can Trigger Equine Asthma, Impact Performance

Just as many humans start to sneeze in the fall, horses also can be affected by seasonal allergies.

Sometimes this is apparent by coughing, but other times, according to Laurent Couëtil, professor of large animal internal medicine in Purdue University's College of Veterinary Medicine, the only sign is that their performance suffers.

Couëtil has spent much of his career treating and researching equine respiratory disease, and he collaborated with three other researchers to argue for the adoption of equine asthma as an official diagnosis in the Equine Veterinary Journal. Equine asthma can flare up as a result of allergies, especially during the fall, which is when many of the traditional spring races were moved.

“We tend to see an increase in horses showing signs of equine asthma during crop harvest season,” he said. “Horses pastured near fields where crops are harvested may be exposed to the dust generated by the combine harvesting crops.” Horses affected by these allergies may develop signs like coughing or increased breathing efforts within a few days of exposure to the dust or allergens and may show impaired performance.

“Other horses with asthma tend to show signs when pollen and molds peak again in the fall,” Couëtil said. “So, the triggers may be different, but horses will show similar symptoms.”

One reason for so many allergy and asthma flare-ups in the fall has to do with feeding. As grass becomes sparse toward the end of the summer or early fall and horses are supplemented with dry hay, more susceptible horses may develop asthma flare-ups.

“Most asthmatic horses are allergic to hay dust,” Couëtil said, “and, therefore, they usually develop clinical signs when fed hay in the barn during the winter months.”

Additionally, feeding round bales is associated with more severe signs because horses are exposed to higher dust levels compared with eating from square bales.

“This is especially true when round bales are left in the field uncovered as they tend to become moldy from exposure to rain and moisture,” Couëtil said.

Couëtil has found that often, less severe asthma symptoms improve when horses are on grass pasture, but during the fall months, this isn't always possible. Feeding low-dust forages can help horses recover and also prevent flare-ups.

“Our recent research demonstrated that athletic horses, such as racehorses, benefit from being fed steamed hay or haylage instead of dry hay,” he said. “These forages result in lower exposure to dust as compared to dry hay, and this translates in lower levels of airway inflammation. Haylage appears to have the strongest beneficial effect, and this effect seems to be linked to higher omega-3 fatty acid content.”

Additional supplementation with nutrients rich in omega-3 fatty acids, like EPA and DHA found in fish oil and algae, can help keep asthmatic horses healthy.

Avoiding exposure to allergy triggers, such as by feeding low-dust forages, can help horses stay healthy and perform at peak levels. During crop harvest season, this might mean keeping the horse in the barn while crops around the stable are harvested.

“If horses continue to show signs of asthma despite environmental management, your veterinarian may prescribe treatment with aerosolized corticosteroids,” Couëtil said.

Taking preventive measures can help minimize horses' exposure to allergens and prevent asthma flare-ups, keeping horses healthy and performing at their best levels.

Couëtil's research is supported by the Grayson Jockey-Club Research Foundation, the state of Indiana and the Purdue Veterinary Medicine research account.

Botulism: A Deadly Disease

Botulism in not a disease many horse owners are familiar with—but they should be as the disease is often deadly. Caused by the Clostridium botulinum bacterium, the soil-borne disease is more common in certain areas of the country, like Kentucky. The spores of the bacterium produce a neurotoxin that block the transmission of nerve impulses to muscles. This results in progressive weakness that makes the horse unable to swallow. Up to 50 percent of horses that receive supportive care can die; those that get no assistance are even more likely to perish from the disease.

Horses can get botulism in three ways:

Ingestion of decaying plant material or animal carcasses in hay or on pasture grass
Infection through wounds
Ingestion of spores and vegetative cells that cause Shaker Foal syndrome

There are different types of botulism: Types and B are associated with forage, while Type C is associated with the accidental ingestion of decaying animals.

A vaccination for botulism type B is available, but it is not considered a core vaccination as it is found mainly in Kentucky and the mid-Atlantic states. A horse's risk of getting the disease should be discussed with its treating veterinarian to determine if vaccination is necessary.

Foals are at particular risk of developing botulism, so pregnant mares should be vaccinated against the disease before they foal. Foals born in areas of the country where botulism abounds should receive Botulism type B toxoid at 2, 4 and 8 weeks old even if the mare was vaccinated.

There are no licensed vaccines for botulism A or C.

Read the AAEP botulism vaccination recommendations here.