Partition of the amino acids in ileal digesta from piglets protein diets

Ileal digesta were collected via a post-valve-T-caecum cannula from piglets ( lo-15 kg) fed diets based on raw pea or on pea protein isolate (Finale or Frijaune variety). From the determined amino acids (AA) content of feed and digesta, AA apparent digestibility coefficients and proportions of proteins (endogenous, bacterial, dietary) theoretically present in digesta were calculated. Four essential AA in the two raw pea diets (Frijaune and Finale, respectively) had a low apparent ileal digestibility: MET (34% and 48%)) CYS (47% and 53%), TRP (42% and 48%)) THR (63% and 63%). The digestibility coefficients of these amino acids were higher in the pea protein isolate diets; MET (75% and 65%), CYS (61% and 61%), TRP (71% and 68%)) THR (79% and 76%), (Frijaune and Finale, respectively). In both cases, these amino acids were less digestible than N. Proportions of dietary, endogenous and bacterial proteins in the collected digesta were estimated from the AA compositions of digesta, according to a multiple regression model. The amino acids present in the ileal digesta of piglets feed the raw pea diets were estimated to originate for 20-308 of them from dietary proteins and for 70-808 from non-dietary proteins (endogenous and bacteria), for both pea varieties. The amino acid composition of the digesta corresponding to the diets based on pea protein isolate would be a combination of endogenous and bacterial sources without significant contribution of dietary protein. Kqvwords: Pea; Protein; Amino acid; Digestibility; Pig