I think it depends on the feed and how/where/when you offer that feed. Mine refused to eat regular grass hay when there was yummy fresh vegetation out there to eat and they would complain and escape if they couldn't get to it. I never tried it, but Anne seems to think Chaffhaye is the ideal winter/supplemental feed. Goats love grain/goat feed but too much of it will obviously make them sick (and too much can be a small amount!). It's really only good as a tool for moving and milking them.I feel ya! I was actually planning on supplementing with some feed on a regular basis. Do you think that would help with the parasite issues?