KER.Equinews.com - Full Article
By Kentucky Equine Research Staff · June 12, 2014
Carbohydrates and lipids are the major fuels used by the muscles of working horses during exercise. Although there are alterations in protein metabolism during exercise, data from several species indicate that protein is used minimally for energy production.
The main endogenous fuel reserves are present in the horse’s skeletal muscle, liver, and adipose tissue. Glycogen present in liver and skeletal muscle represents the storage form of carbohydrate. During exercise, additional glucose is provided by hepatic gluconeogenesis. Two major sources of fat are oxidized during exercise. These are non-esterified fatty acids (NEFA) released from triacylglycerols stored in adipose tissue and transported by the bloodstream to skeletal muscle, and NEFA derived from triacylglycerol deposits located within skeletal muscle fibers...
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