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Horse & Rider Gear is an online glossary of terms and definitions commonly encountered by horse lovers. Click on the links below to choose from our alphabetical list of terms.


Although needed only in trace amounts, selenium is vital for proper muscle development. A deficiency is a suspected cause of azoturia. This mineral is also important in maintaining immune function.

However, it is toxic if eaten in large quantities - certain plants such as locoweed, most vetches, and some varieties of aster store high levels from the soil.