I posted a while ago on the Cribbing Horses/Colic thread, about my young (cribbing) horse getting mild gassy colics recently. I had him scoped for ulcers and he was clean.
I changed him off the beet pulp based pellet and he has not had an episode since, for about 7 weeks now.
When I was racking my brain and googling for gas colic and causes I did find people who said beet pulp caused their horses issues. So I thought I’d post this thread for someone else who might be looking, so far it appears that is the cause of my two year old’s episodes. I had originally put him on it when I thought he might have ucers and took him off a grain based feed. Nothing else has changed, he does not wear a cribbing collar and is still happily (argh) cribbing, but no bellyaches, which he was getting too often. Knock wood, of course.
ETA None of my other horses had any issues with the feed, just him.