Journal of Dairy Science
Volume 74, Issue 10 , Pages 3583-3597, October 1991

Methods for Dietary Fiber, Neutral Detergent Fiber, and Nonstarch Polysaccharides in Relation to Animal Nutrition

Cornell University, Department of Animal Science and Division of Nutritional Sciences, Ithaca, NY

Received 31 August 1990; accepted 6 February 1991.

Article Outline

Abstract 

There is a need to standardize the NDF procedure. Procedures have varied because of the use of different amylases in attempts to remove starch interference. The original Bacillus subtilis enzyme Type IIIA (XIA) no longer is available and has been replaced by a less effective enzyme. For fiber work, a new enzyme1 has received AOAC approval and is rapidly displacing other amylases in analytical work. This enzyme is available from Sigma (Number A3306; Sigma Chemical Co., St. Louis, MO). The original publications for NDF and ADF (43, 53) and the Agricultural Handbook 379 (14) are obsolete and of historical interest only. Up to date procedures should be followed. Triethylene glycol has replaced 2-ethoxyethanol because of reported toxicity. Considerable development in regard to fiber methods has occurred over the past 5 yr because of a redefinition of dietary fiber for man and monogastric animals that includes lignin and all polysaccharides resistant to mammalian digestive enzymes. In addition to NDF, new improved methods for total dietary fiber and nonstarch polysaccharides including pectin and β-glucans now are available. The latter are also of interest in rumen fermentation. Unlike starch, their fermentations are like that of cellulose but faster and yield no lactic acid. Physical and biological properties of carbohydrate fractions are more important than their intrinsic composition.

Key words: dietary fiber, neutral detergent fiber, nonstarch polysaccharides

Abbreviation key: AD, acid detergent, AIA, acid-insoluble ash, ND, neutral detergent, NSC, nonstructural carbohydrates, NSP, nonstarch polysaccharides

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  • 1 The heat stable amylase, formerly Number 5426, has been changed by Sigma as of July 1991. The original procedure required .2 ml of this enzyme. The replacement. Number A3306, is four times stronger, and 50 μl are used per sample.

PII: S0022-0302(91)78551-2

doi:10.3168/jds.S0022-0302(91)78551-2

Journal of Dairy Science
Volume 74, Issue 10 , Pages 3583-3597, October 1991

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