And fed mixed with other grains or hay

And fed mixed with other grains or hay

Wheat and rye. These grains are not to be used for horses except in small quantities, bruised or crushed, and fed mixed with other grains or hay. If fed alone, in any considerable quantities, they are almost certain to produce digestive disorders, laminitis (founder), and similar troubles. They should never constitute more than one-fourth the grain allowance, and should always be ground or crushed.

Fonte: Diseases of the Horse