TP and diet samples were analyzed in duplicate for crude fiber
according to the Weende method, crude protein (AOAC 955.04) and
ether extract (AOAC 963.15) according to the methods of the
Association of Official Analytical Chemists (1990), neutral detergent
fiber (NDF) without sodium sulfite and α-amylase, and acid detergent
fiber (ADF), as described by Van Soest, Robertson, and Lewis (1991)
expressed exclusive of residual ash. Starch content was determined
using the Ewer's polarimetric method (EEC, 1972).