My cattle eat most of the plants listed, except poison hemlock and bracken fern. Most of the plants listed are just good high quality feed, that when managed properly are an asset. Managaed grazing systems eliminate a lot of these types of problems. unmanaged grazing systems, will sometimes have problems with these plants.
What little poison hemlock that we had was easily eliminated from our pasture using timely animal impact and herbicide treatment. Don't have or know what bracken fern is, if I have it, it is a non-problem.