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The salt pellets did not adversely affect the gastric mucosa and the measured dose did not significantly alter the hematologic and serum biochemical variables.
Researchers in Italy compare the effects of a high-starch diet with those of a high-fibre diet.
"High-starch diets should be avoided in favour of fibre-based diets with the goal of safeguarding gut health in horses," the researchers said.
Some horses even appeared to preferred the dried toxic plant to conventional hay.