This isn't a judgment as to the efficacy of yogurt, but I've heard a
number of people talk about the research studies that were done on
horses regarding the benefits of probiotics. The research that was done
(a dozen or so studies at Northwestern) utilized one specific culture
strain of yeast fungus, Saccharomyces cerevisiae. Specifically, the
yeast culture was that marketed as Yea-Sacc, which the research showed
resulted in higher butterfat in lactaing mares, better growth in young
horses and higher fiber digestibility, etc in working horses. All good
stuff.
However, yogurt culture uses the bacteria Lactobacillus---obviously an
entirely different species of "bug". Again, I'm not saying yogurt will
work, won't work or making any sort of comparison---just pointing out
that research results obtained from one species of fungus may not apply
to another species of bacteria in the same way.
Just throwing in .02.
Susan