My barn owner was talking to me yesterday about my mare suddenly not walking to go into her stall when it was dark and then being ok after putting on the lights. She said that 2 other horses there did that and it ended up being a vitamin E deficiency, from reading I think she was talking about EMND. She said she treated with vitamin E and they returned to normal. The vet told her it is pretty common around here(PA) since our soil doesn't have a high vitamin e content so they don't get enough from grass and hay.
Looking at her grain alone, triple crown senior(6.5lbs/day) she is only getting 1,105 IU's, She gets 6-9lbs(can't remember if she gets 1 or 1.5 scoops a feeding) of alfalfa pellets a day also, I can't seem to find if there is vitamin E in alfalfa tho. She also gets grass hay, but from what the vet told my barn owner, that isn't going to have much vitamin E in it.
I read that they should get minimum of 2,000 IU's per day. So should I add some vitamin E to her diet? My barn owner also said not to get one with Selenium. Does anyone know the max Selenium they should have in their diet?