I have my gelding on Equine Choice enzyme/yeast mix that my vet recommended, after having no luck with the stuff that other boarders feed (purchased at Greenhawk). The stuff from Greenhawk made his tummy issues worse, but he seems to be doing well on the Equine Choice. That being said, I board (at a full board facility, where several horses have far more complicated diets than my guy’s “handful of mineral pellets and scoop of probiotics”) and lately the feeders haven’t been giving him his “tummy meds” as I call them. So I have had to depend on his leaser to give him a scoop of alfalfa pellets and scoop of his “meds” before she rides/works him, and then the other days I do the same, because I can’t depend on the feeders to actually give them to him, despite my making it idiot proof (dishing out individual feeds of pellets and probiotics so all they need to do is dump a ziplog bag into his bucket, but when I/my leaser goes out there, the bags haven’t been touched). We move July 15th, thank goodness.
My guy has a VERY sensitive tummy, partly due to having been raised on a diet of rotting hay and rancid beetpulp, in a small paddock, with several larger, also not gelded, horses. Between that food (crappy and in miniscule amounts as he was at the bottom of the pecking order) and the fact that he wasn’t gelded til he was almost 9, left him quite stunted, and anything new/sugary/starchy/concentrated gives him the runs. Previous vet claimed he would “grow out of it” but it got worse, and when I switched vets my new one suggested trying probiotics. The Greenhawk-bought ones made his manure even more liquid, but switching to the Equine Choice really helps, at least when he actually gets it.
Another nice thing with the Equine Choice is that it also comes in an ultra concentrated paste for giving to them before/during/after high stress events (showing, hauling, moving to a new barn, surgery, etc), so I started him with that and saw an instant change. After a week of the paste once per day, he moved on to one scoop of the powder once per day for a week, and now should be up to 1.5 scoops twice per day but since he’s not getting given it at mealtimes he’s getting 2 scoops once per day.