Also, in pigs an ileal digestibility of ungelatinized starch below 0.9 is often observed (Stein and Bohlke, 2007; Willamil et al., 2012), despite a considerably longer retention time of 4 to 10 h in the small intestine (van Leeuwen and Jansman, 2007; Wilfart et al., 2007). The capacity of broiler chickens to digest even unprocessed starchy ingredients is further illustrated by the fact that even when whole untreated cereals have been used in large quantities, starch digestibility has been observed to be very high. Svihus et al. (1997) found ileal starch digestibility to be 0.98 in a mash diet containing 70% untreated whole barley as the only cereal source, and Svihus and Hetland (2001) found that 50% of the birds exhibited an ileal starch digestibility above 0.94,