Contrary to popular belief... bran mashes are NOT good for horses!
My vet does NOT recommend wheat bran to feed to horses for any reason. He ESPECIALLY says to not feed it on a daily basis, as it is too high in phosphorus.
You are a little confused about clearing out sand and dirt. Wheat bran cannot clear out sand and dirt... the only products which have been shown (through their laxative effect) to help clear out sand and dirt is PSYLLIUM as well as WHOLE flax seed.
Old horsemen were under the impression that since wheat bran is laxative for humans, it must work the same way for horses, too. Unfortunately, the sheer amount of fiber that a horse consumes (consider hay, for example!) bran really has no effect!
My vet says that it is a bad idea to change any animal's diet suddenly. So why would you feed a large amount of foreign food all at one time?
To help encourage water intake during a colic, or provide a warm treat if you live somewhere cold, consider feeding beet pulp daily. You can just make it warm to make it close to a "mash"! If you are unfamiliar with beet pulp, try searching the forum by using the "search Topic" box below.
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I'm sure others will chime in. Most Forum members seem to be pretty enlightened on the bran and beet pulp subject.
Andrea