List Of Will Horses & Cows Eat Jimsonweed References. Jimsonweed toxins impact most domesticated animals including cattle, goats, horses, sheep, swine, and poultry. Clinical signs of poisoning in horses include a weak, rapid pulse, dilated pupils, dry mouth, incoordination, diarrhea, convulsions, coma and sometimes death.

Kentucky 31 tall fescue contains an endophyte that produces a toxin called ergovaline. The toxin is found in all plant tissues and seeds. Jimsonweed has a foul odor and taste, and horses rarely consume it if they have other quality forage.