NUTRITION ▶▶▶
Deciphering the dietary fibre message
D BY NEIL JAWORSKI, TREVOR FABER AND FRED MADSEN, TROUW NUTRITION
ietary fibres can be viewed as beneficial or detri- mental based on the context of the total diet. When dietary fibres are poorly fermented, they still pro- mote laxation, epithelial cell regeneration, and fa-
vourable stool quality. When dietary fibres are rapidly ferment- ed, they provide nourishment for the intestinal bacteria, which in turn produce beneficial metabolites that promote animal health. In contrast, excessive fermentable dietary fibre can re- sult in osmotic imbalances and other intestinal disorders. What are some of the new ways of viewing and characterising fibre and how can they help us construct improved diets?
Capturing dietary fibre Crude fibre was developed in the 1860’s to estimate the indi- gestible fractions of a feedstuff (AAFCO, 2017). This method to classify dietary fibres is as the name suggests, crude, and has been found to have very little useful information in mod- ern diet formulation for simple stomached animals. Unfortu- nately, this methodology and label guarantee is still used to this day. Numerous other methodologies are also available with detergent methods and total dietary fibre methods
Dietary fibre is complex; it is a short message, but clear for animal nutritionists. The key to unravelling this complexity is interpreting the analytical data and the biological response that fibrous ingredients will elicit.
being the most prevalent. The detergent methods include neutral detergent fibre (NDF), acid detergent fibre (ADF), and acid detergent lignin (ADL) (see figure 1). These methodolo- gies allow one to identify the insoluble hemicellulose, cellu- lose, and lignin, respectively, within an ingredient. The total dietary fibre (TDF) methodology accounts for a broader array of fibre types that can be partitioned into insoluble dietary fi- bre (IDF) and soluble dietary fibre (SDF). In combination with detergent analyses, one can develop an understanding of the chemical composition and functionality of a dietary fibre source. These are only values based on the analytical method- ology used to measure it. It does not explain the physiologi- cal effects or the complexity of the fibre substrate, since sources of dietary fibre are heterogeneous and their chemical composition does not tell the whole story. Understanding the fermentation rate and degree that a fibre source will be
Goal is to pro- vide slowly fer- mentable die- tary fibre to the young animal.
▶ ALL ABOUT FEED | Volume 27, No. 9, 2019
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PHOTO: RONALD HISSINK
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