The Influence of Diet Composition on the Apparent Digestibility of Crude Protein and Amino Acids at the Terminal Ileum and Overall in Pigs

Publisher Website
Google Scholar
Abstract
To elucidate the influence of diet composition on the ileal and fecal apparent digestibility of crude protein and amino acids and the amounts disappearing in the hind gut, 4 experiments were performed with ileo-cecal reentrant cannulated Danish Landrace pigs according to a 3 .times. 3 Latin square design. The diets were formulated to vary in crude fiber (4-8%), ground barley straw (0-15%), crude protein (16-33%) and crude fat (4-27%). Diet composition had a large influence upon the apparent ileal and fecal digestibility of crude protein and amino acids, whereas the influence of diet composition on the amounts disappearing in the hind gut was limited except for the fiber-rich diets. On the average, 7.6% of crude protein or amino acids disappeared in the hind gut. The amount of the individual amino acids disappearing in the hind gut differed considerably. An average 0.8% net increase of methionine took place in the hind gut, whereas 17.8% of glycine disappeared. The difference between the ileal and fecal apparent digestibilities for lysine and methionine were small, whereas tryptophan, threonine, cystine, proline, serine and glycine always showed larger differences (10-20%). The amounts disappearing in the hind gut of the individual amino acids were very consistent among diets except for the fiber-rich diets.