2. Material and methods
2.1. Diets and raw material
For the experiment a basal diet was formulated based on potato starch, beet pulp, potato protein, egg white powder,cellulose and soy oil (Table 1). Hence the content of digestible phosphorus was adjusted suboptimal to meet the recom-mendation of the Society of Nutrition Physiology (GfE, 1994). Two hundred grams of wheat bran were added in differentforms (native, fermented and extruded) to 800 g of feed. The raw material had a moisture of 103 g kg−1and originated from