Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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All the best,
Dr. Getty
Hi Rayanne,
No, I do not see any reason to continue supplementing selenium beyond what she is getting with the Platinum Performance. She needs 1 to 3 mg per day and up to 5 mg per day if heavily exercised. And keep in mind that there may be selenium in her hay or your pasture. Plus, if you are giving her any fortified feeds, those will also contain selenium.
All the best,
Dr. Getty 
Author of Feed Your Horse Like A Horse
The reason behind the selenium supplement was because my horse tied-up about a year ago during a training-ride with a trainer (I no longer use her and havent had her tie up again with my current trainer). I asked my veternarian when it happened and she suggested putting her on a selenium supplement as it helps in preventing tieing up.
My question to you is - do you think I should keep giving the additional selenium supplement? I personally dont think she is really pre-disposed to tie-ing up being that was the only time it ever happened while I have owned her and I really think it was more to do with the trainer riding her too hard without properly cooling her down. I dont want to over supplement my horse either.. Plus its another $25 dollars a month that I spend for selenium supplement she may not really need??
Where are you from? Waverly, Ohio