I have some fields I am trying to get hayable, but it will take a few seasons to get them up to par. I have oats, vetch, and timothy growing, but also a lot of goldenrod. Is this a problem for goats? Also, I know milkweed is considered toxic, but won't the goats leave it alone unless they are starving? I won't be able to help getting a little milkweed in the hay.