I feed Beet Pulp to my horses. It must be soaked for about 2 hours before you give it because if given dry could expand in their GI tract and cause impaction.
That is not true. Beet pulp can be a choke hazard for horses that bolt their food down really fast, but to cause impaction or a stomach issue with dry beet pulp, a horse would have to eat 15+ pounds of it at one sitting. http://www1.agric.gov.ab.ca/$departm...hrs3243#soaked
"Beet pulp may soak up water like a sponge, but it cannot soak up saliva quickly enough to expand in the esophagus and cause choke. Instead, choke associated with beet pulp (particularly the pelleted form) is often in response to the particle size and the horse's aggressive feeding behaviour, rather than the actual feed itself. Horses that bolt their feed without sufficient chewing, or do not have adequate access to water, are far more likely to choke, regardless of the type of feed, compared to horses that eat at a more leisurely rate.
Nor is it likely that dry beet pulp will rupture the horse's stomach. The equine stomach holds 2 to 4 gallons. This volume is equivalent to 4.5 to 9.5 pounds of dry beet pulp, which is more than most horses receive in a single meal. Likewise, most food that enters the stomach passes on to the small intestine within 15 minutes or less—and for those of you who have timed how long it takes beet pulp to expand, it's longer than 15 minutes." The Myths and Reality of Beet Pulp - Susan Evans Garlinghouse
"Contrary to popular belief, while beet pulp can and usually is soaked prior to feeding, it does not necessarily have to be. In fact, in some management situations, feeding beet pulp dry is the only alternative if beet pulp is to be fed at all. Horses consuming soaked beet pulp in hot weather may be unable to finish off a large portion before it begins to sour and becomes unpalatable. Likewise, horses in cold climates may not be able to finish their soaked beet pulp before it begins to freeze. Research conducted at several universities have fed dry beet pulp in amounts up to 45% of the total diet and saw no instances of choke or other adverse reactions." Beet Pulp
"If you choose to soak it, it is currently recommended to soak it no longer than 1-2 hours, especially in hot weather, as it can begin to ferment. If soaked beet pulp smells sickly-sweet like wine, it has begun to ferment and should be disposed of."