The mucous is quite normal after an impaction, which sounds like what your mare had.Just be sure you keep things moving.After colic I often make a mash with sloppy bran or use beet pulp if you have it.Many times impaction colics are caused by too little water intake.If you are in a sandy area like I am, I feed psyllium daily to avoid sand colic and impaction. I am not a vet, just have way too much experience with colics, sand colics and impaction colics.Fresh grass also helps get things moving, but that is hard to come by in many parts of the country at this time of year.I am lucky I have 1 small patch in a sheltered are near the barn.