If Dr. Williams hasn't already answered this question by tomorrow, I'll be back with Dr. Brown's book in hand. I've called the local ferret vets but they don't seem to have the info, either. Hope it can wait another day. In case I'm in later than when this goes out and it's crucial, I could be reached at (217)-344-4748 where I will be most of the day and will have the book close at hand. Sorry couldn't be more help more quickly. Laura L'Heureux U. of Illinois Vet Med Class of `96 [Posted in FML issue 1038]