My horse has been “grain-free” for most of his life. His commercial feeds have contained no oats, corn, or barley and have been based in beet pulp, alfalfa, and soy. The switch to TC Gold Balancer also removed soy. He currently gets that, Forage Only from Unbeetable (alfalfa, beet pulp, flaxseed oil pellet), grass hay, and pasture. He also gets a smattering of supplements.
The one time he got put onto a feed that contained a lot of oats, he became ulcery, crazy, gassy, and skinny with the runs. Never again.
I will say, I can’t really tell much else though. I THOUGHT maybe I had fixed things for him regarding his summertime skin and coat issues. He lives on short pasture with no weeds where the manure is dragged daily. His stall has a fan and is picked multiple times a day. Bugs just aren’t much of an issue, despite it being absurdly hot and humid here (heat index was 106 today, going outside feels like walking into an oven).
He’s lost all of the hair on his face, is rubbing his entire body on anything strong enough to withstand his weight (hitching post, posts on the barn “porch,” stall doorways, etc. He wears Shoo Fly leggins 24/7 else he’d chew his legs bloody. He wears a fly mask, but I’m starting to think that’s contributing to his hairless face. But he’s an Appy, and I’m protective of his eyes).
This all to say, I have come to the conclusion that once summer reaches this hellish combo of heat and humidity that isn’t fit for man nor beast, it doesn’t matter what I’m feeding him. He’s managed in the best possible way, but it makes no difference. If anything, right now it’s about as bad as I’ve ever seen. He’s going through a bout of anhidrosis too, which makes everything worse for his skin.
So, regarding inflammation…I do find actual grain does inflame his gut. That’s a no-go for him. To date, I cannot say that anything he eats causes inflammation anywhere else. His epidermis seems to be inflamed by the environment more than anything else.
All of that long, not necessarily on-topic stuff said, there are enough options for “grain-free” feeding of horses now, that it’s not hard to do at all. Many, many commercial feeds do not contain actual “grain” in them these days. Triple Crown Senior has always been a good one for the horse that needs the calories but not the grain. Good stuff.