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The Scoop On Eating Dirt

Many horse owners have been told that a horse that eats dirt is missing specific nutrients in his diet—but this line of thinking is outdated. Seeing a horse licking or chewing dirt is concerning as the ingestion of soil can increase the likelihood he will develop sand colic.

A horse fed the proper amount of a commercial feed formulated for his age and lifestyle should lack for nothing with regards to vitamins, minerals and nutrients; so ingesting soil isn't to “make up” for a deficiency in his diet. If a horse was lacking something in his diet severely enough to make him want to eat dirt, he would show other signs of the deficiency, including weight loss or a dull coat.

Horses typically eat dirt because they're bored. In a natural setting, horses graze nearly constantly—and that time spend chewing is good for their mental health. A horse eating dirt might be seeking the feeling the chewing motion brings, so offering him something like hay in of a slow feeder might give him something to pass the time. Increasing his workload (if possible) or giving him a playful pasturemate may also help ease his boredom.

Is Colic The Only Reason For Bacterial Changes In The Gut? Probably Not

It's long been known that the best way to prevent ulcers in horses is to make sure they have something to eat—preferably forage—nearly constantly. But what happens if feed and hay are withheld to not exacerbate a problem, like colic?

Drs. Jaclyn Willette, Dipti Pitta, Nagaraju Indugu, Bonnie Vecchiarelli, Meagan Hennessy, Tamara Dobbie and Louise Southwood found that the bacterial population of a horse's gut changes if he has been without food for at least 10 hours.

Chronic gastrointestinal disease leads to a decrease in variety of bacterial species in the gut of humans and cattle; the same is thought to be true for horses.

The bacteria in a colicking horse's gut is distinctly different from that in a healthy horse's gut. While this could be related to intestinal problems and inflammation that is leading to the colic epsiode, other factors could be at play, including withholding feed, which is an essential tool in managing a horse with colic.

The study team used eight mares for a crossover study that withheld nearly all feed for 24 hours and then allowed each horse free-choice timothy hay for 24 hours. The horses had access to water at all times.

The researchers found that bacteria richness and diversity were significantly lower 10 to 24 hours after the fast began. This limited bacterial population persisted for 2 to 12 hours after the horses were given access to hay. The horse's gut returned to normal 18 to 24 hours after the hay was reintroduced.

The team concluded that the effect of withholding feed should be considered when interpreting data on species and amount of gut bacteria in horses. Their findings may help locate markers that will lead to the development therapeutic interventions for horses that are colicking.

Read the study here.

Sand Colic Survey Results Lead To Interesting Conclusion

Horse owners and veterinarians have assumed for many years that horses develop sand colic because they accidentally ingest sand. A new study out of Finland suggests some horses may develop sand colic because they actually seek out and eat the soil.

Drs. Kati E.Niinistö, Meri Määttä, Mirja Ruohoniemi, Maria Paulaniemi and Marja Raekallio conducted an online survey of owners whose horses had been radiographed at some point in their lives to check for sand accumulation in their gut. Survey questions included what signs prompted the call to the veterinarian, how the horse was managed at the time of the vet call and how much sand had accumulated. A total of 447 surveys were used.

The scientists found that the veterinarian was called because the owner suspected sand accumulation and X-rays confirmed the suspicion. Symptoms of sand ingestion seen most often among respondents were colic, diarrhea and poor performance, which his often a subtle sign. “Poor performance” can mean that the horse doesn't want to go forward or may not be moving well.

Horses that exhibited signs of colic often had significant accumulations of sand in their gut. The team also found a correlation between poor performance and large sand accumulation. Horses that were colicky and had poor performance had the highest levels of sand in their gut.

Interestingly, the study team found no connections between sand accumulation, management or housing. This may be because some horses habitually ingest soil. The scientists are collecting samples to determine if any of the horses with sand accumulation are deficient in trace minerals, which would cause them to seek out soil to ingest.

The team also discovered that horses that cleaned up every scrap of hay had larger sand accumulations than horses that didn't eat all their hay. This may be related to keeping horses out for long periods without access to proper grass.

Whether sand ingestion is intentional or a byproduct of greedy horses, prevention of sand accumulation is key. Treating susceptible horses with psyllium a few times a year can clear sand that has already been ingested; feeding in a bucket and offering hay or muzzling horses that forage too much are also options.

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.