Soluble dietary fiber, insoluble dietary fiber, and total dietary fiber in feed ingredients used in diets for pigs

Dietary fiber is defined as the undigestible carbohydrates and lignin fractions of plant-feed ingredients. The most complete and representative analysis of fiber is the total dietary fiber (TDF) analysis, which includes the soluble dietary fiber (SDF) and the insoluble dietary fiber (IDF). There is, however, a lack of data for concentrations of SDF, IDF, and TDF in feed ingredients commonly used in diets for pigs. Therefore, work was conducted to quantify fiber fractions of plant feed ingredients to establish a database for SDF, IDF, and TDF in feed ingredients commonly used in animal nutrition. A total of 846 samples were analyzed for dry matter (DM) and for IDF and SDF, and TDF was calculated as the sum of IDF and SDF. Analyzed values for SDF, IDF, and TDF were corrected to 88% DM. For each feed ingredient, means and standard deviation were calculated. Results indicated that values for TDF were in the range of 3% to 35% for cereal grains, from 1% to 68% for cereal grain coproducts, from 3% to 68% for oilseeds and oilseed co-products, and in the range of 3% to 82% for other plant-based feed ingredients. In conclusion, the present work resulted in generation of a database for SDF, IDF, and TDF in feed ingredients often included in diets for pigs and other animals.