Robin, the 'short abstract' you quote in your post seems to leave a lot of loose ends, if I may say so...for instance-what exactly is meant by 'supplementing the diet' in the three ways mentioned-how often, what amounts, etc? What was the 'control diet'? Of what overall significance is the statement that 'sand output is highest on day 2 and 3 post treatment?"-post treatment with WHAT-the control diet, and/or the aforementioned the methods/amounts(not specified!)of 'supplementing'??
Logic would support the apparent finding that sand accumulation is generally highest in fall and winter(grass is declining/gone, likely to be less water intake, etc.) I have begun using soaked beet pulp(pellets, no molasses added)-began with a once-daily amount of from one cup to three cups per mini, depending on their size(@ 175 lb. to @ 400 lbs. for my 38" B mare),have increased by @ a cup/horse now that it's winter-fed quite wet, but not a complete 'soup'-after they've first been fed hay, and have been eating that for a while. (Found, with my 24 YO mare, that three cups was a bit much-she developed persistently overly soft manure, which has resolved with a drop back to 2 cups of beet pulp; others are fine with the increased amount. )I like the results, plan to continue to feed the beet pulp. Question: do you feel that the above-referenced study means that some could stop the regular use of psyllium, if feeding proper amounts of soaked beet pulp daily-presuming that the rest of the feeding program provides adequate nutrition AND the right kind and amount of fiber? Where I live, the native soil really isn't sandy; it is a heavy clay (adobe); but, over the years, the horses' runs had crusher fines brought in, and the finest part of that seems to me much like a 'sand'. I would be happy to be able to stop using psyllium, though-would simplify my life (and of course, save money!)- but would not wish to do so without a pretty sure feeling that to do so would not be detrimental.
Will appreciate your educated opinion on this....!
Margo