Comparison of the amino acid pattern of different feedstuffs prior to and post in situ incubation.
- Publikations-Art
- Kongressbeitrag
- Autoren
- Leberl, P., Remppis, S., Steingaß, H. and Drochner, W.
- 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)
- 24
- Tagungsort
- Stuttgart-Hohenheim
- Tagungsdatum
- 08.-10.03.2005
- Schlagworte
- amino acids, feedstuff, incubation
In the future development of protein evaluation Systems for ruminants, the estimation of the quantity of amino acids available at the duodenum will have an essential role. Besides the prediction of amirio acid supply from undegraded feed protein is required. Hence the question arises, whether the amino acid composition of the entire feed protein is representative for the amino acid composition of the rumen undegradable protein (UDP). The aim of this study was to show degradation characteristics of crude protein (CP) and individual amino acids from different feedstuffs in order to compare the amino acid pattern of the feedstuffs with their undegradable protein residue after the incubation. Results: The CP of com gluten (17,0%), silkworm pupae (30,9%) and potato protein (37,0%) is characterised with a high resistance against degradation in the rumen. On the other hand the CP of field beans (96,8%) and barley (89,2%) is degräded almost completely after 20 hours incubation. The roughage samples obtained slightly higher PAF4 amounts in the residues after incubation, due to the mibrobial attachment of the particles. In contrast the PAF 4 of the concentrate feedstuffs decreased, but only to a small extent of 0,01-0,07. That means, the protein quality of the residue is only marginally lower with an exception of long incubation times as it can be seen in rapeseed meal after 50 hours incubation (0,63%-> 0,53%). Conclusions: For the feedstuffs tested in this study, the amino acid pattem of the entire feedstuff protein seems tobe an adequate measure for the description of the amino acid pattem of the UDP, when assuming high or medium rumen passage rates.