I did a search on “hindgut” but did not find anything that really addressed my question so I’ve started a new thread.
Backstory - my 9-year old mare, Emma, (Canadian Sport Horse - PerchxTB) has always had an excellent work ethic, wants to please and was progressing beautifully earlier this year. During my horses’ spring health exam, the vet opined that Emma looked a little thin, pointy across the croup and suggested some extra calories, such as Sentinel LS. We slowly added that to her beet pulp and a balancer ration. About 10 days after adding LS to her diet, she started to display several behavioral changes - became girthy although not consistently, started to give little hops while trotting, and her formerly stellar downward transitions became awkward. Basically, she was resistant to collecting or lengthening, which was very new. I tried a different girth, a different saddle with no change. Towards the end of April, she coliced but recovered quickly. I had a well respected chiropractic vet evaluate her and the vet said neck and recommended another vet for anti-inflammatory injections. That vet evaluated, agreed that it was neck and did the injections but Emma’s behaviors continued. It then occurred to me that the LS product has grain and maybe that was causing inflammation throughout her GI system. I called Triple Crown and rattled off her symptoms and the rep said “hindgut”. Emma is now on TC Senior Gold and Balancer Gold. The girthy-ness is gone but the reluctance to collect or extend remains.