Cereal Chem. 70:275-279   |  VIEW ARTICLE

Starch, Energy, and Protein Utilization by Rats in Milled Rice of IR36-Based Amylose Extender Mutant.

B. O. Eggum, B. O. Juliano, C. M. Perez, and G. S. Khush. Copyright 1993 by the American Association of Cereal Chemists, Inc. 

The utilization of starch, energy, and protein in cooked milled rice of amylose extender (ae) mutant 2064 and its IR36 parent were examined in growing rats. Despite the higher lysine content of the ae mutant (3.83 vs. 3.32 g per 16 g of N), net protein utilization and protein quality of the two rices were comparable because of the lower protein, energy, and starch digestibility of the mutant. Starch, energy, and protein digestibility of the mutant decreased progressively from raw to cooked to cooked-parboiled, with or without the addition of the antibiotic Nebacitin (used to suppress hindgut fermentation) in the diet. Unlike the same ae mutants in corn, the rice ae mutant did not have a considerable increase in resistant starch with increased amylose content.