Standardization of ileal amino acid digestibilities in early-weaned pigs.

Publikations-Art

Kongressbeitrag

Autoren

Eklund, M., Piepho, H.P., Tafaj, M. and Mosenthin, R.

Erscheinungsjahr

2005

Veröffentlicht in

Berichte der Gesellschaft für Ernährungsphysiologie

Herausgeber

H. Martens (Hrsg.)

Verlag

DLG-Verlag , Frankfurt a. M

Serie/Bezeichnung

Proc. Soc. Nutr. Physiol.

Seite (von - bis)

35

Tagungsort

Stuttgart-Hohenheim

Tagungsdatum

08.-10.03.2005

Schlagworte

amino acids, digestibility, ileal amino acid, piglet, pig nutrition

Apparent ileal digestibilities (AID) of crude protein (CP) and amino acids (AA) are transformed to standardized ileal digestibilities by correction for the basal ileal endogenous losses (EL) of CP and AA. Standardized digestibility values reflect the fundamental properties of the feedstuff being independent of experimental conditions. To standardize ileal CP and AA digestibilities in early- weaned pigs a study was carried out a)to quantify the amount of EL of CP and AA in ileal digesta of piglets; b) to establish the dietary threshold levels for CP and AA above which the AID of CP and AA remain constant; c)to investigate whether the total amount of CP or AA ingested may exceed the piglet's capacity for digestion and absorption. Res. & Concl.: AID of CP and AA increased quadratically (p<0.05) with increasing levels of CP and AA in the experimental diets (Figure 1). After reaching their individual plateau values, there was no further increase in AID of CP and AA. The respective breakpoints (p<0.05) were similar to those determined previously in growing pigs. The breakpoints determined in this study were considered as dietary threshold levels at which ileal CP and AA digestibilities were independent of their respective dietary levels. Additionally, there was no indication that the capacity for digestion of CP and absorption of AA was limited with increasing dietary levels of CP and AA. This is in contrast to results previously determined in weaned pigs, and indicates that the previously observed decrease may be attributed to other dietary factors or the level of feed intake itself rather than to the total amount of ingested protein. The EL of CP, LYS, MET, THR, and TRP were 9.26, 0.43, 0.08, 0.55 and 0.05 g/kg dry matter intake (DMI) (p<0.05), respectively. The EL of CP and AA, expres- sed in g/kg DMI, were similar to values previously determined in growing pigs. Accordingly, the TID of CP and AA from casein ranged between 96.2 % (TRP) and 103.6 % (GLY) (p<0.0001).