Our Jersey cow went down a couple of weeks ago, but acts OK, just won't get up. Maybe 7 yrs. old, pregnant but not due till March. Alert, holds head up, eyes clear, eats good & excretes a lot but not diarrhea. Nothing stuck in hoof, no sores, no broken bones. 2 vets have looked at her, gave calcium, minerals, etc., but still the same. Any ideas?