Prussic acid poisoning occurs when livestock graze certain plants that contain cyanide-producing compounds. Such species include, but are not limited to, sorghum, sudangrass, sorghum-sudan hybrids, Johnsongrass, and wild cherry. Cyanide can interfere with oxygen utilization in livestock, especially if consumed in large amounts. Symptoms appear quickly after consumption and may include cherry red colored blood, staggering, labored breathing, spasms, foaming at the mouth, falling, thrashing, severe convulsions, and death.