I was wondering when someone would bring this up. The transit time
through the equine gut is significantly longer than the length of a ride. I
doubt that any probiotics administered at holds get anywhere near the large
colon before the end of a ride.Probiotics administered after a ride are
probably helpful in recovery from the stress of the event.
That said, I doubt anyone administering them is hoping to fool the
vets. Especially since gut sound are only one of a number of parameters
evaluated.
--Charlotte