My horse has this and I feed him 1AC. I think it works great for Spring and Fall so that I can ride but I'm seeing that it's not helping a hole lot during these hot days we are having right now. Right now I try to just hose him down when he gets overheated and keep a good eye on him. He just developed this 2 years ago when he turned 11. He's never been worked much, I just trail ride him when I have time so I know it can't be from to much work. I can't help but wonder if it's genetic.
I'm definitely going to try beer in his feed and see if that helps. I'm up for anything that might do the trick tho. So any suggestions are greatly appreciated.