Red Maple Leaves
Red Maples trees are seemingly harmless for most of the year; however, as the leaves wilt they become very toxic to horses. The wilted leaves of Red Maples produce cyanide. When consumed, cyanide blocks oxygen transport via blood cells causing the red bloods cell to die and, if high enough levels are consumed, the horse to suffocate. The toxins also cause damage to the kidneys, liver, and other organs.
How to Distinguish Red Maple LeavesThe distinctive features of Red Maple leaves with allow you to distinguish between other leaves falling that are harmless. Red Maple leaves have serrated edge, and turn red or yellow in the fall with a silvery underside.
Signs of Cyanide Poisoning in Your Horse
Curiosity and boredom can cause horses to consume the toxic leaves of Red Maples. As little as a pound consumed by your horse can be fatal. Depending on how many leaves are consumed, signs can become visible within a few hours or as long as five days after eating the leaves. A horse that has been poisoned will show signs of lethargy, food refusal, dehydration, discolored (dark red or black) urine, jaundice gums that eventually darken, increased heart rate, and increased respiration.
Treating Your Horse For Cyanide PoisoningThe only treatment for cyanide poisoning is supportive therapy with IV fluids to dilute the toxins in the blood in less severe cases of cyanide poisoning. In some cases blood transfusions are also a possibly. If they make it through supportive therapy, cyanide-poisoned horses can then develop laminitis because blood flow has been compromised. The recovery process is then a long process with it taking more than three weeks for red blood cell counts to return to normal.
Other Plants and Trees that Contain Cyanide
Cherry, peach, and plum tree leaves also produce equally toxic levels of cyanide. Silver and Sugar Maple leaves produce slightly lower levels of cyanide when wilted, so your horse must consume to develop cyanide poisoning. When Johnsongrass or Sudan grass is injured from wilting, trampling, or frost both contain toxic levels of cyanide for your horse. In the early stages of growth Johnsongrass contains its highest levels of the toxin, which are toxic for your horse. When these grasses are cured for hay, the cyanide drops to levels that are safe for your horse to consume.