While native such as death camas and lupine can be extremely toxic to sheep, certain species of noxious weeds can be toxic to cattle and horses. While most of these toxic plants are not desirable forage for animals, if they are forced to eat them, they can result in problems. Plants toxic to horses include houndstounge and Yellow Starthistle. Plants toxic to cattle and horses include tall buttercup and Common Tansy (for sheep) St. Johnswort causes blistering on cattle, Tansy Ragwort for cattle.
Friday, October 23rd, 2009