pregnant mare nutrition?

[VenetaT]

I am very new at caring for pregnant mares. Yesterday, I was told that I should be selenium supplementing my mare throughout her pregnancy even though she is getting selenium out of pasture food. I know a horse can have too little selenium in their diets and there is also a possibility that a horse can be overdosed on selenium.
My question is: when, how and what should I do about supplementing my mare?

 

[LindaP]

Locate the mare and foal feed at your local farm supply store. If you follow the directions for her in the proper recommended amounts, your mare and foal should both be fine. If you are still not sure, get her an Equine Salt /Mineral block. Pregnancy and birth are a little intimidating to get used to but it's been going on for a long time. They'll both be fine!