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Apparent Digestion in Various Segments of the Digestive Tract of Ponies Fed Diets with Varying Roughage-Grain Ratios

Cornell University, Ithaca, New York 14850

Abstract

Eleven ponies were fed diets containing 1:0, 3:2 or 1:4 forage-grain ratios for 30 days. Animals were killed 4 hr. after feeding and the entire digestive tracts were removed and segments isolated. Digestion coefficients were calculated for dry matter, protein, available carbohydrate (ACHO) and neutral detergent fiber (NDF) by Cr₂O₃-nutrient ratio for seven segments of the gut.

The major site of ACHO and protein digestion was prececal; whereas, the major sites of NDF digestion were the colon and cecum regardless of the hay:grain ratio. Therefore the relative importance of digestion in the lower gut increased with increased levels of forage.

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