Abstract
The objective of this study was to investigate the effects of total dietary fiber level on nutrient digestibility and the relationship between apparent total tract digestibility of total dietary fiber, and soluble dietary fiber, insoluble dietary fiber and available energy. Sugar beet pulp was as the only fiber source. The experiment was designed as a 6 × 6 Latin square with an adaptation period of 7 d followed by a 5-d total collection of feces and urine. Feed intake tended to decrease (P =0.10) as total dietary fiber level increased. The apparent total tract digestibility of dry matter, crude protein and gross energy decreased (P <0.01) when total dietary fiber increased but the digestibility of soluble dietary fiber and insoluble dietary fiber increased (P <0.01). The digestible energy and metabolizable energy content of diets decreased (P <0.01) as the total dietary fiber increased.
Highlights
Total dietary fiber (TDF) is the sum of the dietary carbohydrates that are resistant to digestion by mammalian enzymes in the small intestine but can be partially or completely fermented in the hindgut [1]
The intake of TDF, soluble dietary fiber (SDF) and insoluble dietary fiber (IDF) and the excretion of TDF and IDF increased (P
There was a good relationship between apparent total tract digestibility (ATTD) of TDF and IDF (r2 = 0.93), but a poor relationship between the ATTD of TDF and SDF (r2 = 0.28)
Summary
Total dietary fiber (TDF) is the sum of the dietary carbohydrates that are resistant to digestion by mammalian enzymes in the small intestine but can be partially or completely fermented in the hindgut [1]. TDF can be divided into soluble dietary fiber (SDF) and insoluble dietary fiber (IDF) [2]. Dietary fiber is a key factor determining nutrient utilization in the diet and more emphasis should be given to routine techniques that identify the nutritional and physiological “quality” of dietary fiber [3]. Most of SDF and partial of IDF are degraded by bacteria in either the small or large intestine [4,5,6]. IDF was found to decrease intestinal transit time, binds organic compounds and increases fecal bulk [8]
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