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.
Read more at EQUUS magazine.
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