Investigation of the treatment of sand accumulations in the equine large colon with psyllium and magnesium sulphate

Both groups had no access to soil during the study period. The amounts of accumulated sand were evaluated radiographically before and after treatment. Significantly more treated horses cleared their sand accumulations than horses in the control group. This clearance was determined by observing the estimated quantity by area of sand remaining in the large colon (P < 0.001) and by comparing the numbers of successfully treated horses (P = 0.004) between the two groups after 4 days of treatment. However, there were unexplained individual variations in the clearance of sand accumulation.