Home > Crops & Livestock > Livestock > Animal Health > Sheep & Goats > Poisonous Plants for Louisiana Livestock in the Fall [Image: Senna occidentalis] Images of major poisonous plants are presented to assist livestock owners with plant recognition. Toxic effects are also mentioned. Hurricane Aftermath Can Present Potential Livestock Disease Problems Cattle, goats, horses, pigs and sheep surviving Hurricane Katrina and Hurricane Rita are vulnerable to several diseases, including infectious diseases and toxicities, according to a veterinarian with the LSU AgCenter.