I have been reading the book Natural Goat Care by Pat Coleby. In the book she talks of using copper as a wormer she states that she read a study by Dr. William A. Albrecht that found "...the copper did not actually kill the worms, rather the copper was absorbed by the animal and no worms of any kind would stay in or suck blood from an animal that has plenty of copper in its tissues." And that she has used this for ten years with success on goats as well as other animals (page 288-289). Has anyone tried this? Does it work? I know they need copper and their minerals do have some copper. Would love to hear some thoughts on this. We use Cydectin right know. Thanks!