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The dexamethasone suppression test involves administering dexamethasone, a synthetic glucocorticoid, to the horse, and measuring its serum cortisol levels before and 19–24 hours after injection. In a normal horse, dexamethasone administration results in negative feedback to the pituitary, resulting in decreased ACTH production from the pars ...
Dexamethasone is a fluorinated glucocorticoid medication [10] used to treat rheumatic problems, a number of skin diseases, severe allergies, asthma, chronic obstructive pulmonary disease (COPD), croup, brain swelling, eye pain following eye surgery, superior vena cava syndrome (a complication of some forms of cancer), [11] and along with antibiotics in tuberculosis. [10]
In veterinary medicine, trichlormethiazide can be combined with dexamethasone to be used on horses with mild swelling of distal limbs and general bruising. [2] As a diuretic (in particular a thiazide), trichlormethiazide encourages water loss from the body. [1]
Dexamethasone – a synthetic glucocorticoid binds more powerfully to the glucocorticoid receptor than cortisol does. Dexamethasone is based on the cortisol structure but differs at three positions (extra double bond in the A-ring between carbons 1 and 2 and addition of a 9-α-fluoro group and a 16-α-methyl substituent).
The horse is considered a "thin animal" (with little fat), whose weight is divided into approximately 11 % bone, 50 % muscle and 9 % fat; [2] but a large number of factors influence its weight. Some breeds (draft horses) are naturally heavier than others , and differ in size and bone structure, so the weight range of horses is highly variable.
Grass is a natural source of nutrition for a horse. Equine nutrition is the feeding of horses, ponies, mules, donkeys, and other equines. Correct and balanced nutrition is a critical component of proper horse care. Horses are non-ruminant herbivores of a type known as a "hindgut fermenter." Horses have only one stomach, as do humans.
Retroactive research conducted at the time the term "Dosage Index" first became common knowledge revealed that at that time no horse having a Dosage Index of higher than 4.00 had won the Kentucky Derby since at least 1929 (a year chosen because by then the number of available of chefs-de-race on which to base the figures was thought to have ...
However, horses with a low body condition score lack the fat reserves for strenuous work and also may lack lean muscle. [10] Horses with a very high body condition score carry too much weight, which interferes with stamina and biomechanics. Some studies addressed the relationship of body condition score and endurance performance in endurance races.