I just figured out that EPSM and PSSM are the same as you said. I was under the impression that they may have been two seperate, but related things...but I was wrong.
Army...how do you supplement vit E? I'm not sure if she gets enough with the ration balancer or not now. Snickers has never tied up or had muscle tremors either. After my really observing her and learning much lately, she looks like she has a combination of fibrotic myopathy with locking stifle. She is actually very controlled under saddle, more so as to when she is just running around. However, I don't have her cantering or anything either. I would not ever ride her down a steep trail either. I witnessed her from behind yesterday walking down a steep gravel road. Her fetlocks would look like they would pop and then drag with each step at times.
Desert.....I was going to attempt the hay bag today, however, the original ones I ordered are on back order and so I found a local tack store that has them instead. I'm going to get them today....same ones, the nibble nets.
Look at your balancer and let me know how many UI's she's getting daily. Also, (VERY IMPORTANT) is the scientific name. Does it start with a D-ALPHA-...
Or does it start with DL-ALPHA-....
D-ALPHA-TOCOPHERYL (last word can be slightly diff,) is the natural form of vit E. If your feeding synthetic, your probably just wasting your time and money.
Natural vit E is EXTREMELY important. It's one of those vitamins that can't really be replicated in a way that makes it effective. Horses getting synthetic vit E only get about half the UI's as it says they will. Ask Dr. Beth and see what she thinks maybe?
I THINK a normal horse should be on about 1,000 UI's daily.
Since my horse developed EMND, she will be on at least 2,000 UI's daily for the rest of her life. And maybe even more, a lot more. So that is one disease that you want to prevent, and it's incredibly easy to do so!!!
Also worth noting....vit E has been known to play a huge role in horses with neuro problems. :) :) :)