Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
Welcome to my forum.
Here you will find more than 6 years of questions and my answers. It is searchable and offers a great deal of information.
Currently, I am discontinuing new questions. This may change in the future, but in the meantime, please know that It has been a true pleasure serving you.
Take a look at my Nutrition Library and Tips of the Month for a variety of answers on selected topics. Be sure to sign up for my monthly e-newsletter, Forage for Thought.
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All the best,
Dr. Getty
Hi Sue,
I would suggest that instead of a probiotic, you add a prebiotic such as Ration Plus. I always like to use this when horses have a change in feed or environment, to keep the bacterial flora in the hind gut healthy. Ration Plus does not contain live microbes, like a probiotic. Instead, it feeds the existing microbes making them healthy and better able to manage changes in feed and improve digestion.
Probiotics are best used when a horse is undergoing antiobiotic therapy or has diarrhea.
Hope this is helpful!
All the best,
Dr. Getty 
Where are you from? Bayfield, CO