In addition, the observed effects on digestibility are in agreement with data of Dierick and Decuypere (2004), in which addition of an emulsifier to the diet of growing pigs showed a significant improvement on AFD of nonfat fractions, while AFD of fat was not affected. Seen
the great public concern of nitrogen pollution of surface water caused by livestock production, and the high costs for disposal of broiler manure, a reduction in faecal and urinary nitrogen excretion offers, besides a decrease in feed cost (Nahm, 2007), anadditional environmental benefit.