I have alot of thistles growing in areas of my pasture. I understand goats will eat them, which I think is great, but does it cause off flavors in the milk?
You'll probably have to just wait and see! I'd read about off-tasting milk with a variety of things, but it has not been my experience.
I give my dairy gals xmas trees, rutabagas, and the buck is in with them temporarily. No off tastes yet. But I tend to not drink milk straight, I use it in things.