feeding a foal

What is the best vit & mins for a mare in foal?

I have a mare that foaled last year & is now in foal again. The person who owned her last year did not feed her any feed whist in foal or after foaling. She ate gras & haylage. She is a good weight & all is well with her. I want to give her something to build her up after already having a foal last year & now in foal again.
There is plenty of haylage for her & I am feeding her with chaff once a day. I need to know what the best vitamins & mins there is to give to her.
Thank you in advance.

We had our mare on Body Builder all the way threw her Pregnancy, if you don’t want to go that way, just go to you local Tractor Supply store and they should help and have what you need

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