This issue will cover:
• Fiddleneck and Related Plants
• Crotalaria Species
• Senecio Species
• Chokecherry and Wild Cherry (Prunus)
• Sorghum and Sudan Grass
• Bermuda Grass
• Black Locust
• Oak Trees
Again I need you to know that I have not written the following – I am not a Vet or a plants man, so I have copied this information simply to make it easy for you to read. I would not re-write it because I was afraid of getting something wrong that may prove fatal to your horse, so I make no apologies for copying this.
Fiddleneck and related plants
Other behavioral abnormalities include recklessness, charging, lack of coordination, circling, staggering, "dragging" of the hind limbs, which have been described as the "sleepy staggers". The horse may also appear listless, hang its head and acting sluggish or depressed. Signs of colic may be present, which may include straining, diarrhea and rectal prolapse. Small foul smelling ulcers may appear in the mouth.
The chronic patient will become a poor keeper, show yellow membranes around the eyes and mouth, produce a rough coat and eventually become anemic and die. Fortunately healthy horses need to consume amsinckia plants over a period of time before enough liver damage occurs to produce symptoms. Unfortunately, once cirrhosis of the liver develops, it is for all practical purposes irreversible.
Crotalaria Species
Crotalaria, predominantly found in the south and southeast, has been the cause of many horse losses. Known as wild pea, rattle box and rattle weed, crotalaria has been intentionally planted as an agricultural cover crop to enrich the soil from the Atlantic seaboard, west into Texas. Two species, crotalaria sagittalis and crotalaria spectabilis, are particularly toxic and produce the same effects as fiddleneck.
Senecio Species
Senecios comprise one of the largest genre of plants in the midwest and western US.Not all species are poisonous, and of those which are, only a few contain enough alkaloids to cause problems in horses. Those which do can produce the same kind illness as fiddleneck. Senecio jacobaea is particularly toxic. In the Nebraska region, "walking disease" is caused by senecio. In the Pacific Northwest, the disease is commonly called "Hard Liver Disease" or "Walla Walla Walking Disease."
Other species such as ragwort, common groundsel and "Stinking Willie" are generally considered toxic, however their alkaloid content seems to be less than senecio jacobaea.
Chokecherry and Wild Cherry (Prunus)
Chokecherries, growing in bushes up to 12 feet high, are popular for their jelly producing berries. They are common throughout the US, often found along roadsides or creek bottoms. Unfortunately the leaves, which are particularlytoxic when stressed or wilted, as well as the bark from chokecherries and wild cherries are cyanide producing. Death in horses can occur literally in minutes after the horse has ingested the leaves. The horse will appear to have trouble breathing, show flared nostrils and lose bowel and urinary control. Lack of coordination and trembling may also appear, along with agitation. A severely poisoned horse will drop to the ground, kick a few times, then die. Poisoned horses can be saved, however usually veterinary help cannot arrive in time as the effects of cyanide poisoning progress rapidly.
Sorghum and Sudan Grass
Sorghum and Sudan Grass, both of which can be effective as livestock feed when grown, harvested and cured correctly, can produce cyanide poisoning when improperly managed. After a hard frost or trampling, prussic acid can build up in new growth which grazing horses are likely to seek out. The effects of this poisoning is the same as with choke cherries.
Other problems associated with grazed or improperly baled sorghum and sudan grasses include urinary tract complications, causing thick and viscous urine and bladder infections. Signs of such problems may appear as buildup inside the horse's hind legs. If left untreated, the infection can become fatal. Pregnant mares may abort or give birth to deformed foals.
There are species of sorghum which are developed especially for animal feed, and we have fed them with great success. However, when feeding sorghum to horses, one should be certain what kind of sorghum is being grown and that the grower knows how to properly manage, cure and bale the crop. Unless you really know what you are doing, letting your horse graze on growing sorghum or sudan grass can be a risky proposition.
Bermuda Grass
Berumuda grass can be good feed for horses, however in certain climates a harmful fungus called ergot can be present and which appears as small brown or black nodules on the bermuda grass or dallis grass seed heads. When consumed, a condition known as "Bermuda Grass Shakes" or "Dallis Grass Tremors" can occur, producing such symptoms as lack of coordination, tremors, strange head movements and tongue rolling, and in severe cases, paralysis.
Once the tainted forage is discontinued, horses may recover rapidly, virtually overnight to several days. Pregnant mares, however, may abort.
Black Locust
Horses tied to black locust trees or black locust posts and who have chewed on the bark can become poisoned, becoming very ill in just a few hours. Symptoms include loss of appetite, general weakness and depression.Symptoms of a mild colic may also be present. Horses can ingest enough bark to prove fatal, although most recover after several days or weeks.
Oak Trees Horses have been known to binge on acorns, particularly if they are hungry and are not used to having them around. Acorns and many oak leaves are high in tannin. It is relatively easy for a horse to ingest several pounds of acorns in a relatively short period of time leading to an unfortunate overdose. Well, that’s it from me on poisonous plants. I would suggest that you keep all 3 of these newsletters handy just in case. In fact I have printed them off and am going on a walking tour of my fields and local pastures and see what I can spot that is potentially dangerous. Then I will report it to owners, and if its in my pastures, take appropriate action to ensure that my horses aren’t hurt by it. I would suggest that you find time to do the same.
From the author: Roger Bourdon has written a book on Introduction To Horsebackriding and Horse's Health. (Article Adapted by All About Horses)Learn All About Horses Here:
- Learn Horse Training Breaking Secrets. Five Horseback Riding Video Lessons Teach Natural Riding Without Bouncing, Safely Controlling Your Horse And Riding Bareback And Bridleless.
- Learn To Grow Gorgeous Horses! Now You Too Can Grow Long, Thick, Luxurious Horse Manes and Tails and Make Any Horse Stunningly Gorgeous Amazingly Fast!
- The Ultimate Guide To Pampering Your Horse provides a gold mine of ideas and inspiration. "For grooming, bathing, and hoof-care suggestions to homemade treats, toys, parties, games (and even costumes!) You'll find step-by-step directions for guaranteed horse-pleasers such as: Slop and Slurp Delight, Homemade Bug-Be-Gone, Edible Christmas Wreath, Mad Hatter Birthday Party and much more!
- Think your horse has laminitis? You need to know or at worst your horse could die! Treatment for both Laminitis and Founder are both explored in the content of this one of a kind e-book Liminitis And Founder Exposed