Alfalfa

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Alfalfa

Abundant in protein and calcium, alfalfa is a good source of forage for young, growing horses and lactating mares. For most other horses, it can be too rich and lead to obesity. The high protein concentration can lead to excess nitrogen intake, which is excreted in the urine, causing a pungent ammonia smell in the stable. Western states in particular grow a lot of alfalfa and tend to feed it in the form of hay cubes because baled hay is harder to come by in these areas.

Closeup of horse eating hay

Another drawback to keep in mind if feeding alfalfa hay is blister beetles, which produce a poisonous substance called cantharidin that is toxic when fed to horses. Be sure to break open a few flakes and inspect them for traces of blister beetles before purchasing alfalfa hay.

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This article originally appeared in the 2010 issue of Horses USA. Click here to purchase a copy.

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Holly Caccamise has been with Horse Illustrated and Young Rider magazines since 2007, and in 2019, she became Editor in Chief of both titles. Caccamise has a master's degree in Animal Science with a specialization in equine nutrition and exercise physiology. She has also worked as a racing magazine ad copywriter and top-level show groom.

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