Alfalfa hay is considered beneficial to feed horses in hot weather for several reasons:

1. High Nutritional Content: Alfalfa is a legume hay that is rich in essential nutrients, including protein, calcium, and other minerals. Horses require a balanced diet to maintain their health and energy levels, especially during hot weather when they may be more prone to dehydration and electrolyte imbalances.
2. Hydration Support: Alfalfa has a higher water content than grass hays, which can help supplement a horse's water intake during hot weather when they might not be drinking enough. Proper hydration is crucial to prevent heat stress and related health issues in horses.
3. Cooler Feed Option: Alfalfa hay is typically cut at a younger age than grass hays, making it more leafy and less stemmy. The leafiness of alfalfa hay can help in cooling down the horse's body temperature during digestion compared to coarser hays.
4. Electrolyte Balance: Alfalfa hay has a naturally higher calcium-to-phosphorus ratio, which can aid in maintaining electrolyte balance in horses. Maintaining proper electrolyte levels is crucial in preventing heat-related issues like muscle cramps and exhaustion.
5. Weight Maintenance: Horses may have a harder time maintaining weight during hot weather due to increased energy expenditure to stay cool. Alfalfa's higher caloric content can help horses maintain a healthy body condition during periods of intense heat.
6. Palatability: Many horses find alfalfa hay more palatable than other types of forage, which can encourage them to eat enough and maintain their energy levels during hot weather when they might be less inclined to eat due to heat-induced stress.

Despite its benefits, it's essential to feed alfalfa hay in moderation and based on individual horse needs. Some horses may not tolerate alfalfa well due to its higher protein content, and overfeeding it could lead to health issues such as excessive weight gain or metabolic imbalances. As with any dietary changes, it's best to consult with a veterinarian or equine nutritionist to determine the right feeding plan for your specific horse.  Age, weight, activity level, geographic location and overall health status play major roles in how to meet your horses nutritional needs.

Bridget Brandon is President of The Equine Expert LLC, a multi-discipline equine expert witness and consulting firm offering legal expert witness, consulting, and valuation services in court cases, legal matters, estates and business affairs.  Bridget is also owner of ValueMyHorse LLC, providing equine appraisals, a buyers advocate service, breeding operation, farm consulting and retirement board. Bridget is also a property and casualty field agent for Marshall Sterling selling equine, and farm and ranch insurance. For more information on Bridget visit www.theequineexpert.com, www.valuemyhorse.com or you may contact Bridget at Bridget@theequineexpert.com or Bridget@valuemyhorse.com.