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Message: <blockquote data-quote="VenetaT" data-source="post: 2230838" data-attributes="member: 781749">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?</blockquote>