Be careful with the Selenium. Vitamin E works synergistically to increase the uptake of Selenium as well.

It's hard however to OD on straight E.

All of mine get a squirt of E oil in their food 2 x/day. A generous squirt. I also feed 5 grams of ascorbic acid 2x /day. C helps to recycle/reactivate E although over feeding C CAN interfere with b12 absorption in the gut.

What you really need as far as minerals is hard to guess at without a hay or pasture analysis. Dairy One has an Equine Complete package that's pretty good for a first time analysis. I wouldn't do it though if the suppliers change often. Some suppliers have already had their hay tested and will provide the results on request.


I have mine on free choice minerals and when I first started the amounts they would consume were both staggereing and frightening. I rationed it out to a handful a day in the mineral container until they began leaving some behind. It takes between 2 weeks to a month. Now all just have it kept topped off and they consume at will.

What I notice, is that when out feed is off their mineral intake will increase and when we get it right they slow down.

One of the first symptoms in a chronic selenium toxicity situation is loss of mane and tail hair. Watch for that, but if the new feed has selenium added I would drop the E&SE personally and begine a straight E. I just use the human grade squirt bottles you can get in a health food store.

I don't know much about PSSM but you may want to look into supplementing with Magnesium as it's been shown to help regulate insulin. I DO know that it's helped insulin resistant horses.

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