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Laminitis is a inflammation of laminae that affects the feet of ungulates and is found mostly in horses and cattle. Clinical signs include foot tenderness progressing to inability to walk, increased digital pulses, and increased temperature in the hooves.
Although support-limb laminitis is a risk for any horse that is not weight-bearing lame, occurring in roughly 16% of cases, it is uncommon in foals and yearlings. [135] It usually occurs weeks to months after the initial cause of lameness, [ 136 ] and greatly increases the likelihood of euthanasia of the patient. [ 137 ]
A normal horse with have a cranial phase and a caudal phase of equal length: the horse will bring the leg as far forward as it does backward. In a lame horse, the cranial phase will be shorter when compared to the caudal phase, so it appears to spend more time with the leg backward than it does forward.
Horses are best managed by only allowing short grazing periods—less than 1 hour since they can rapidly ingest grass, [18] or confining them to a limited turn-out area or by use of a grazing muzzle. Horses with severe IR, that have recurrent laminitis, are not recommended to return to pasture.
Several plants, including nightshade, become more toxic as they wilt and die, posing a danger to horses eating dried hay or plant matter blown into their pastures. [3] The risk of animals becoming ill during the fall is increased, as many plants slow their growth in preparation for winter, and equines begin to browse on the remaining plants.
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A horse with PPID, which has an overactive pars intermedia not regulated by glucocorticoid levels, does not suppress ACTH production and, therefore, cortisol levels remain high. False negatives can occur in early disease. [1] Additionally, dexamethasone administration may increase the risk of laminitis in horses already prone to the disease. [8]
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