Thanks Ladyhawk! I found a couple sites today where I didn't have to look-up every other word.
I saw where you said the only symptom is weight loss...
Did your vet tell you your horse had "hepatic disease"?
The only reason I ask is due to a weight loss issue I dealt with about seven years ago...
All three of my girls drastically lost a lot of weight and I couldn't figure out why. Even after worming they continued to lose it. Taking their feed up didn't help so I called the vet to find out when I could worm them again. (I think it was two weeks after the initial worming but not sure...)
Anyhow, after worming them again they put their weight back on pretty quick and I had to take their feed back down! Within a month their weights were back to normal... Then a couple of months later, I was talking to a lady I know who has a breeding facilty. She had the same thing happen at her place and even lost one of the foals as a result... Her's was from a bad lot of wormers. Comparing notes we found that I had used the same wormer but we couldn't be sure it was from the same lot...
Just something to think about especially if the diagnostic was not by your vet! : )
June