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Carbohydrate digestion and absorption in the equine small intestine.
Dietary carbohydrates, which constitute a most important source of equine nutrition, are digested and absorbed by a series of complex processes principally in the small intestine, beginning with intraluminal starch hydrolysis by the action of pancreatic amylase. The continuous secretion of a copious volume of pancreatic juice, low in enzyme activity, presumably releases sufficient oligosaccharides for further hydrolysis at the intestinal cell surface by brush border enzymes. Active carrier mediated mechanisms then transport the final hexose products across the intestinal cell for uptake in the hepatic portal system. Brush border disaccharidase activities in the equine small intestine are of the same order of magnitude, and have a similar distribution pattern, to those reported in omnivorous and carnivorous species. The disaccharidase development patterns are characteristic and reflect the ability of the horse to digest the major nutrient sources adequately at various stages of life. The efficiency of the mucosal disaccharidases and the monosaccharide transport systems in the equine small intestine have been established by a series of oral disaccharide and monosaccharide tolerance tests. Horses older than three years of age are unable to hydrolyse lactose, but young and adult horses are fully capable of rapidly hydrolysing sucrose and maltose loads. Several tests have clinical application for assessing small intestinal dysfunction in the investigation of diarrhoea and malabsorption. The deficient digestion or absorption of carbohydrate, whether primary or secondary, can almost always be localized to a defect in the enzymic or transport capacity of the small intestinal surface cell. The continued ingestion of lactose could be detrimental in severely diarrhoeic foals.
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